CN112586409B - Cultivation method for indoor pond intermediate cultivation of finless eel fries - Google Patents

Cultivation method for indoor pond intermediate cultivation of finless eel fries Download PDF

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CN112586409B
CN112586409B CN202011443732.XA CN202011443732A CN112586409B CN 112586409 B CN112586409 B CN 112586409B CN 202011443732 A CN202011443732 A CN 202011443732A CN 112586409 B CN112586409 B CN 112586409B
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pond
seedlings
cultivation
fries
young
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CN112586409A (en
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裴琨
吴一桂
曾尚伟
梁越
韦朝民
檀宁
苏春伟
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FANGCHENGGANG FISHERY TECHNOLOGY EXTENSION STATION
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FANGCHENGGANG FISHERY TECHNOLOGY EXTENSION STATION
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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; CARE OF BIRDS, FISHES, INSECTS; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K61/00—Culture of aquatic animals
    • A01K61/10—Culture of aquatic animals of fish
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/80—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
    • Y02A40/81—Aquaculture, e.g. of fish

Abstract

The invention discloses a method for cultivating finless eel fries in an indoor pond in an intermediate mode, and belongs to the technical field of aquaculture. The method comprises the following steps: (1) arranging a culture pond; (2) selecting seedlings; (3) transporting seedlings; (4) putting seedlings; (5) training seedlings; (6) daily management of the culture pond; (7) and (5) harvesting the young eels. The method has the advantages that the facility construction, installation and maintenance of the culture pond are simple, the fry training and eating, the water quality management is accurate and easy to control, the fry diseases are few, the fry collection is easy, the average total length of the rice field eel fries is more than 16cm after 2-4 months of culture, the average body weight is more than 6g, the fry survival rate is more than 96.3 percent, and the method provides large-scale and high-quality rice field eel fries for the large-scale culture of the rice field eels in batches. The finless eel fries cultivated by the method have the advantages of high survival rate, regular specification, high growth speed, convenient cultivation management, low cultivation cost, realization of large-scale cultivation of the finless eel fries and very good application prospect.

Description

Cultivation method for indoor pond intermediate cultivation of finless eel fries
Technical Field
The invention belongs to the technical field of aquaculture, and particularly relates to a method for cultivating finless eel fries in an indoor water pool in the middle.
Background
Monopterus albus belongs to the class of the fishes, order of gill-union, family of gill-union and subfamily of Monopterus albus, and is one of the important economic fishes in China. The ecological floating bed is fond of inhabiting in a still water area environment with more humus and acidity in nature, and is constantly laid in mud holes or stone cracks of environments such as rivers, creeks, rice fields, ponds, lakes and the like; the gills are underdeveloped, the gills are vertical to the front half part of the body in shallow water, air is sucked from the mouth to the water surface and stored in the oral cavity and the throat, and the breathing is carried out by means of the epidermis on the inner walls of the oral cavity and the throat cavity; various small animals are taken as food, but the animals greet and choose food, and the phenomenon of eating too much and too little exists; there is a sexual reversion phenomenon, female first and male second. The finless eel is hypoxia-resistant, can be cultured in shallow water and a small pool at high density, and is very suitable for rural courtyard culture and enterprise intensive and industrial culture.
At present, the source of the finless eel breeding fries is mainly to capture natural fries, and the artificial fries are rarely supplied. On one hand, the quantity is limited, the quality is difficult to ensure, and the sustainable development of the finless eel breeding industry is restricted; on the other hand, as a result of the abuse, resources are seriously damaged, affecting the ecological environment. Therefore, resource protection and artificial propagation of the finless eel are imperative. However, the artificial breeding fries face the bottleneck of high mortality rate in the middle culture stage, the survival rate of large-size fries is low, the economic benefit of culture is affected, and the problem of shortage of the ricefield eel breeding fries becomes increasingly prominent. Aiming at the problem of finless eel fry mid-culture, a set of culture method with high survival rate of finless eel fries is explored, and the method has important economic significance for finless eel culture industry.
The application number is 201310316557.1, the invention is named as a patent of 'a method for breeding finless eel fries in an artificial bionic manner', the finless eel fries are bred by arranging a bionic breeding net cage, but the method does not cultivate large-size young finless eels. The application number is 201310333213.7, the invention is named as a method for cultivating finless eel fries by micro-flowing water circulating type grids, and discloses a method for cultivating young finless eels by placing a plurality of cultivating cylindrical grids in a plurality of cultivating barrels to obtain young finless eels with the specification of 8-10 g. The patent with the application number of 201110287793.6 and the invention name of 'a method for cultivating large-size eel fries' discloses that net cages are arranged in a pond in rows, the survival rate of the eel fries can be improved to 80-90%, the individual size of the eels can reach 8-10g on average, but the method has the defect that the problem of sudden change of outdoor environment cannot be solved, and the failure of fry cultivation can be caused if the environment is not controlled well. Both a micro-flow water circulation type grid finless eel fry cultivation method and a large-size finless eel fry cultivation method relate to a finless eel fry intermediate cultivation method, but in the two methods, plants such as water hyacinth and water peanuts are used as finless eel concealed objects, finless eels lose rest platforms and shelter spaces when the plants die, and the water quality is influenced due to plant decay; the former is not domesticated by other feeds, and the finless eel fries can form a fixed bait habit, are selected for eating, do not eat artificial mixed feed and are not beneficial to being bred; the latter is difficult to domesticate and observe.
Therefore, a method for cultivating the finless eel fries, which has the advantages of improvement of the survival rate of the finless eel fries, regular specification, high growth speed, convenience in cultivation and management, easiness in collection of the fries and low cultivation cost, is needed to be found so as to meet the requirement of large-scale cultivation of the finless eel fries.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for cultivating finless eel fries in an indoor water pool in the middle, which comprises the following steps of (1) arranging a cultivating pool; (2) selecting offspring seeds; (3) conveying seedlings; (4) putting seedlings; (5) training seedlings; (6) daily management of the culture pond; (7) the method comprises the steps of harvesting young finless eels and the like, improves the survival rate of finless eel fries, realizes the large-scale cultivation of the finless eel fries, and provides large-scale high-quality large-size finless eel fries in batches for the large-scale cultivation of the finless eels.
The invention is realized by the following technical scheme:
a finless eel fry indoor culture frame seedling bed is characterized in that the seedling bed comprises a structure support frame, a net layer and a concealed object; the structural support frame is a square frame and is detachably connected with the net layer at the bottom of the square frame to form a cube; the concealed object is arranged on the upper surface of the net layer; the net layer is a plastic net sheet with the mesh of 0.8-2 cm.
As a further preferred aspect of the present invention, the structural support frame is formed by connecting one or more side by side; the structural support frame is made of a wood strip or a plastic pipe; the height of the wood strip is 5-10cm, and the width is 3-5 cm; the diameter of the plastic tube is 2-5 cm.
As a further preferred of the invention, the shelter is a waterproof and corrosion-resistant imitation aquatic weed plastic belt with the diameter of 1.5-2cm and the length of 15-20 cm.
As a further preferable mode of the invention, the concealing object is formed by bundling non-toxic and odorless green plastic tapes which are slightly heavier than water and easy to clean, and the width of each plastic tape is 0.4-0.8 cm.
A method for culturing finless eel fries by utilizing an indoor culturing frame seedling bed of the finless eel fries comprises the following steps:
(1) the culture pond is arranged: arranging a seedling bed in the culture pond, wherein the area of the seedling bed accounts for 1/3-1/2 of the area of the culture pond; the hidden objects on the net layer of the seedling bed are hung on a structural support frame of the seedling bed or at the side of a culture pond, and an accessory facility is installed in the culture pond, is a pneumatic device and consists of a batch of inflatable insertion tubes; after the seedling bed is arranged, disinfecting the whole culture pond, introducing fresh water according to the specification of seedlings, and controlling the seedling bed to sink and float to enable the water level to be higher than the net layer surface;
(2) seed selection: selecting healthy and healthy finless eel fries with disappearance of yolk sacs and bright body color; the rice field eel fries comprise black fries, young eels and young eels; the total length of the black fries is 3-6cm, the total length of the young eels is 6-10cm, and the total length of the young eels is 10-15 cm;
(3) and (3) seed transportation: adding water, putting the seedlings and hidden objects into the plastic bags, and transporting the seedlings after adding the breathable covers; the density of the transported seedlings is 1 to 5 ten thousand tails/m 2 Stopping feeding for 1-2 days before transportation, filling water according to the volume of 1/3-1/2 of a plastic bag during transportation, wherein the temperature difference between the water in the original seedling seed pool and the water in the plastic bag is not more than 2 ℃, and transporting under the condition that the water temperature is 18-28 ℃; the road is rainy during transportation, and the rain is covered;
(4) seed putting: putting the seedlings with the same specification, and adjusting the temperature of water in the transportation plastic bags filled with the seedlings and the temperature of the water in the culture pond to be not more than 2 ℃ when putting the seedlings into the culture pond; the position for putting the seedlings is close to the concealed object, and after the seedlings are put into the pond, anti-stress substances are sprinkled in the whole pond;
(5) fry training: the fry is divided into three growth stages of black fry, young eels and young eels for food training; the method comprises the following specific steps:
firstly, the black young seedlings take red nematodes as main materials and are supplemented with earthworm meat paste and fish meat paste mixture; feeding live red-line worms for domesticating the black seedlings at the first opening, and ensuring the palatability and freshness of baits;
secondly, the young eels are mainly mixed with earthworm meat paste and fish meat paste, and are supplemented with red nematodes and feed;
thirdly, the young eel is mainly mixed with feed, earthworm and fish, and is supplemented with feed;
feeding for 1-2 times every day, wherein the daily feeding amount is 2-3% of the total weight of each seedling, and 5-8 feeding points are set; after feeding each seedling for 10-20 minutes, checking the feeding condition of the seedling to adjust the type, proportion and daily feeding amount of the fed feed;
(6) daily management of the culture pond: during the cultivation period, the cultivation is carried out in a mode of feeding water from the bottom of the pond and blowing air from the surface of the pond, and the cultivation water temperature is 18-32 ℃; after feeding the feed for 1-2 hours, changing water in a bottom discharge and bottom feeding mode, and controlling the water feeding and discharging amount to discharge residual bait and excrement in the pond, so that the seedlings do not leave hidden objects; after 30-45 days of cultivation, specification classification cultivation is carried out, and the depth of a seedling bed in water is adjusted according to corresponding specifications; changing the concealed matter every 5-7, and sterilizing and airing the changed concealed matter by using 5% saline solution for later use; the pond is patrolled 3-4 times every day, and problems are timely treated;
(7) harvesting young eels: after 2-4 months of cultivation, the total length of the finless eel fries reaches more than 15cm, the weight reaches more than 5g, and then the finless eel fries can be harvested; when the young eels are harvested, the receiving tool is firstly placed at the collecting pipe opening of the culture pond, the drainage switch is turned on, so that the young eels flow into the receiving tool, and then are moved into the culture pond or the transportation device.
As a further preferred aspect of the present invention, in the step (5), the ratio of the earthworm meat paste and the minced fish meat mixture for the black-fry is 1-2: 1; the ratio of the earthworm meat paste to the fish meat paste mixture which is eaten by the young eels is 1-2: 1; the ratio of the feed for young eel to the earthworm meat to the fish meat mixture is 1-2:1: 1.
In a further preferred embodiment of the present invention, in the step (5), the living red nematodes selected for black-fry hatch domestication and feeding need to be temporarily cultured for 1 to 2 days, and are subjected to sterilization and insect-repellent treatment, and young living red nematodes are selected and fed by using a 30 to 50-mesh silk screen.
As a further preferable mode of the invention, in the step (6), the classified cultivation is that the seedlings with the same specification are put together and cultivated according to a screening method with the specification of 5cm or more and 7cm or less, the specification of 7cm <10cm, the specification of 10cm <15cm or less and the specification of 15cm or more.
As a further preferred aspect of the present invention, in step (1)) Wherein the outer diameter of the tube of the inflatable intubation is 0.5-1cm, the length of the inflatable intubation is based on each point extending to the bottom of the culture pond, and the tube distribution density is 2 tubes/m 2 The branch pipes 1 are put into the bottom of the pool below the net bed to be inflated, and the branch pipes 1 are hung at the side of the pool to blow air into the pool.
As a further preferable mode of the invention, in the step (6), the difference between the temperature of water in the culture pond and the temperature of the water surface of the culture pond is not more than 2 ℃, the pH value is 5.5-6.8, the dissolved oxygen is more than 3.5mg/L, the ammonia nitrogen is less than 0.8mg/L, and the nitrite is less than 0.05 mg/L.
In the invention, the anti-stress substance is coated vitamin C, and the dosage is 2-3g/m 3 . After the finless eel fries enter the culture pond, stress reaction is easy to generate due to the fact that the finless eel fries do not adapt to new living environments, such as the weather and the water temperature change greatly; the stress reaction is mainly manifested by slow action, food refusal, weakness and reduced or disappeared immune function when the hidden object is on the offspring seeds. Therefore, after the seedlings are put into the pond, the coated vitamin C is sprayed to the whole pond. Vitamin C can regulate the secretion of glucocorticoid to be maintained at a proper level, increase energy supply and avoid immunosuppression; can relieve hypothyroidism and maintain the production of enough endogenous vitamin C; as an important antioxidant substance in extracellular fluid, the composition can coordinate and improve the clearance of oxygen free radicals in tissues and protect biological membranes from the oxidative damage of the free radicals; promoting the synthesis of collagen, enhancing the toughness and strength of vessel walls, reducing stress injury and reducing the death rate of seedlings.
Compared with the prior art, the invention has the advantages and beneficial effects that:
1. the method has the advantages that the facility construction, installation and maintenance of the culture pond are simple, the fry training and feeding, the water quality management are accurate and easy to control, the fry diseases are few, and the fry collection is easy; after 2-4 months of cultivation, the eel fries grow to more than 16cm of average full length, the average body weight reaches more than 6g, the survival rate of the fries reaches more than 96.3 percent, namely the requirement of cultivation is met, and large-scale high-quality large-size eel fries in batches can be provided for the large-scale cultivation of the eels; the finless eel fries cultivated by the method have the advantages of high survival rate, regular specification, high growth speed, convenient cultivation and management, low cost, realization of large-scale cultivation of the finless eel fries and very good application prospect.
2. The breeding bed arranged in the breeding pond consists of the structure support frame and the net layer, is simple to manufacture, can provide enough rest platforms and avoiding spaces for the continuously growing finless eel fries, provides a safe living environment for the finless eel, meets the natural habit of punching the finless eel, and is arranged indoors, so that the finless eel growth is not easily influenced by the external environment, the situation that the fries are easy to generate stress reaction is reduced, the survival rate of finless eel breeding is improved, and the scale of finless eel fry breeding is realized.
3. The hidden objects selected by the invention are the imitation waterweed plastic belts which are nontoxic, tasteless, non-putrefactive and non-water-pollution, the defect that in the prior art, plants are used as the hidden objects, and the plants can not normally grow in an indoor culture pond due to lack of illumination and are easy to perish, so that the water quality is easy to pollute is overcome, in the invention, the hidden objects are replaced once every 5-7 days, and the replaced hidden objects are disinfected and aired for later use, so that the water in the culture pond is always kept clean, the normal growth of finless eel fries is facilitated, the survival rate of finless eels is improved, and the environment-friendly benefit and the economic benefit are good.
4. The invention trains and eats the finless eel fries, trains and eats the growth stages of the black fries, the young finless eels and the young finless eels respectively, and reasonably collocates the proportion of baits and commercial feeds, the feeding times and the daily feeding amount according to the finless eel fries in different growth stages, so that the finless eels have good ingestion habits, are not selected to eat, and are beneficial to culturing the finless eel fries with regular specifications.
5. The invention screens the finless eel fries with different specifications for classified cultivation, and puts the fries with the same specification together for cultivation, thereby avoiding the situation that large finless eels eat small finless eels, ensuring the safe growth of the finless eels and being beneficial to improving the survival rate of the finless eel fries.
Drawings
Fig. 1 is a schematic view of a structure of a frame seedling bed of the present invention.
FIG. 2 shows a first mode of setting up a seedling bed in a culture pond.
FIG. 3 shows a second mode of setting up a seedling bed in the culture pond.
Fig. 4 shows the finless eel in the hidden matter of the seedling bed in the culture pond.
In fig. 1: 1-a structural support frame; 2-a mesh layer; 3-concealment.
Detailed Description
The present invention is further illustrated by the following examples, which are provided only for the purpose of illustration and are not intended to limit the scope of the present invention.
Example 1
As shown in fig. 1, the indoor finless eel fry culture frame seedling culture bed comprises a structural support frame 1, a net layer 2 and a concealed object 3; the structural support frame 1 is a square frame and is detachably connected with the net layer 2 at the bottom of the square frame to form a cube; the concealment object 3 is arranged on the upper surface of the net layer 2; the net layer 2 is a plastic net sheet with a mesh of 1.4 cm; the structural support frame 1 is formed by connecting one support frame; the structural support frame 1 is made of battens; the height of the wood strip is 8cm, and the width of the wood strip is 4 cm; the concealed object 3 is a waterproof and corrosion-resistant imitation float grass plastic belt with the diameter of 1.8cm and the length of 18 cm; the concealment object 3 is formed by bundling non-toxic and odorless green plastic belts which are slightly heavier than water and easy to clean, and the width of each plastic belt is 0.6 cm.
A method for culturing finless eel fries by utilizing an indoor culturing frame seedling bed of the finless eel fries comprises the following steps:
(1) the culture pond is arranged: arranging a cubic frame seedling bed in a culture pond made of indoor plastic plates, wherein the area of the seedling bed accounts for 1/3 of the area of the culture pond; the hidden objects on the net layer of the seedling bed are hung on the structural support frame of the seedling bed or the side of the culture pond, the culture pond is internally provided with an accessory facility, the accessory facility is a pneumatic device and consists of a batch of inflatable insertion tubes, the outer diameters of the tubes of the inflatable insertion tubes are 0.8cm, the lengths of the inflatable insertion tubes are based on points extending to the bottom of the culture pond, and the tube arrangement density is 2 tubes/m 2 The branch pipe 1 is put into the bottom of the pool below the net bed to be inflated, and the branch pipe 1 is hung at the side of the pool to blow air into the pool; after the seedling bed is arranged, disinfecting the whole culture pond, introducing sand-filtered fresh water according to the specification of seedlings, controlling the depth of the pond to be 15cm, and controlling the seedling bed to sink and float through ropes so that the water level is 4cm higher than the net layer of the seedling bed;
(2) seed selection: selecting strong and healthy finless eel fries with no diseases, lost yolk sacs and bright body color in Qinzhou city, Guangxi, 5 months and 16 days in 2019; the rice field eel fries comprise black fries, young eels and young eels; the total length of the black fries is 4cm, the total length of the young eels is 8cm, and the total length of the young eels is 12 cm;
(3) and (3) seed transportation: filling the plastic bags in a pot with the length of 70cm, the width of 44cm and the depth of 17cm, adding water, putting seedlings and hidden objects in the plastic bags, and transporting the seedlings after adding a breathable cover; the density of the transported seedlings is 3 ten thousand tails/m 2 Stopping feeding for 1 day before transportation, filling water according to 1/3 of the volume of the plastic bag during transportation, wherein the temperature difference between the water in the original seedling seed pool and the water in the plastic bag is 2 ℃, and transporting under the condition that the water temperature is 22 ℃; the road is rainy during transportation, and the rain is covered;
(4) seed putting: putting the seedlings with the same specification in the same pond, and stocking the seedlings with the stocking density of 5000 tails/m 2 When the seedlings are put into the culture pond, adjusting the difference between the temperature of water in the transportation plastic bags filled with the seedlings and the temperature of the water in the culture pond to be 2 ℃; the depth of the seedling bed is 2cm, and the position for putting the seedlings is close to a concealed object, so that the seedlings can be concealed as soon as possible; after the seedlings are put into the pond, the coated vitamin C is sprinkled on the whole pond to resist stress, and the dosage is 2g/m 3 ；
(5) Fry training: the fry is divided into three growth stages of black fry, young eels and young eels for food training; the method comprises the following specific steps:
firstly, taking red nematodes as main materials of black young seedlings, and adding a mixture of earthworm meat paste and fish meat paste in a ratio of 1:1 as auxiliary materials; feeding the black seedlings by domesticating the food and selecting the live red line worms, wherein the live red line worms need to be temporarily cultured for 1 day, and are subjected to sterilization and insect repelling treatment, and the young live red line worms are selected by a silk screen mesh with 40 meshes for feeding, so that the palatable and fresh bait is ensured;
secondly, the young eels are mainly mixed with the mixture of earthworm meat paste and fish meat paste in a ratio of 1:1, and are supplemented with red nematodes and feed;
thirdly, the young eel is mainly mixed with feed, earthworm meat and fish meat in a ratio of 1:1:1, and is supplemented with feed;
feeding for 1 time every day, wherein the daily feeding amount is 2% of the total weight of each seedling, and 5 feeding points are set; after each seedling is fed for 15 minutes, the ingestion condition of the seedling is checked so as to adjust the type, the proportion and the daily feeding amount of the fed feed;
(6) daily management of the culture pond: during cultivation, the cultivation is carried out by adopting a mode of feeding water into the bottom of the pond and blowing air from the surface of the pond, the cultivation water temperature is 26 ℃, the difference between the water temperature in the pond of the cultivation pond and the air temperature on the water surface of the pond is kept to be 2 ℃, the pH value is 6.2, the dissolved oxygen is 4.6mg/L, the ammonia nitrogen is 0.6mg/L, and the nitrite is 0.02 mg/L; after feeding the feed for 1 hour, changing water in a bottom discharge and bottom feed mode, and controlling the water inlet and discharge amount to discharge residual baits and excrement in the pond, so that the seedlings do not leave hidden objects; culturing for 35 days, and performing specification classification culture according to specification of 5 cm-7 cm, 7cm<Specification of<The specification is 10cm, 10cm and less than or equal to<15cm and the specification of more than or equal to 15cm are screened, the seedlings with the same specification are put together for cultivation, and the average stocking density is 2500 tails/m 2 2000 tail/m 2 1500 tailed/m 2 1000 tail/m 2 Adjusting the depth of the seedling bed in water according to corresponding specifications, wherein the depth is respectively 4cm, 5cm and 6cm, and ensuring that the seedlings can comfortably swallow air; changing the concealed matter every 5-7, and sterilizing and airing the changed concealed matter by using 5% saline solution for later use; the pool inspection is carried out 3 times every day, and problems are found and processed in time;
(7) harvesting young eels: after 4 months of cultivation, namely 9 months and 16 days in 2019, the survival rate of the finless eel fries is 97.5 percent, the average total length can reach 19cm, and the average weight reaches 8g, so that the finless eel fries can be harvested; when the young eels are harvested, the fishing net is placed at the collecting pipe opening of the culture pond, the drainage switch is turned on, so that the young eels flow into the fishing net and are moved into the transportation device.
Example 2
As shown in fig. 1, the breeding bed of the finless eel fry indoor culture frame comprises a structural support frame 1, a net layer 2 and a concealed object 3; the structural support frame 1 is a square frame and is detachably connected with the net layer 2 at the bottom of the square frame to form a cube; the concealment object 3 is arranged on the upper surface of the net layer 2; the net layer 2 is a plastic net sheet with a mesh of 0.8 cm; the structural support frame 1 is formed by connecting one support frame; the structural support frame 1 is made of a wood strip or a plastic pipe; the height of the wood strip is 5cm, and the width of the wood strip is 3 cm; the diameter of the plastic tube is 2 cm; the concealed object 3 is a waterproof and corrosion-resistant imitation aquatic weed plastic belt with the diameter of 1.5cm and the length of 15 cm; the concealment object 3 is formed by bundling non-toxic and odorless green plastic belts which are slightly heavier than water and easy to clean, and the width of each plastic belt is 0.4 cm.
A method for culturing finless eel fries by using an indoor finless eel fry culture frame seedling bed comprises the following steps:
(1) the culture pond is arranged: arranging a cubic frame seedling raising bed in a culture pond made of indoor plastic plates, wherein the area of the seedling raising bed accounts for 1/3 parts of the area of the culture pond; the hidden objects on the net layer of the seedling bed are hung on the structural support frame of the seedling bed or the side of the culture pond, the culture pond is internally provided with an accessory facility which is a pneumatic device and consists of a batch of inflatable insertion pipes, the outer diameter of each inflatable insertion pipe is 0.5cm, the length of each inflatable insertion pipe is determined by each point extending to the bottom of the culture pond, and the pipe arrangement density is 2 pipes/m 2 The branch pipe 1 is put into the bottom of the pool below the net bed to be inflated, and the branch pipe 1 is hung at the side of the pool to blow air into the pool; after the seedling bed is arranged, disinfecting the whole culture pond, introducing sand-filtered fresh water according to the specification of seedlings, controlling the seedling bed to sink and float by a rope so that the water level is 2cm higher than the net layer of the seedling bed, wherein the pond water depth is 5 cm;
(2) seed selection: selecting healthy and healthy finless eel fries with no diseases, lost yolk sacs and bright body color in Qinzhou city, Guangxi in 2019 in 2.6.8.4; the rice field eel fries comprise black fries, young eels and young eels; the total length of the black fries is 3cm, the total length of the young eels is 6cm, and the total length of the young eels is 10 cm;
(3) and (3) fry transportation: filling the plastic bags in a pot with the length of 70cm, the width of 44cm and the depth of 17cm, adding water, putting seedlings and hidden objects in the plastic bags, and transporting the seedlings after adding a breathable cover; the density of the transported seedlings is 1 ten thousand pieces/m 2 Stopping feeding for 1 day before transportation, filling 1/3 water with the volume of a plastic bag during transportation, wherein the temperature difference between the water in the stock seedling pond and the water in the plastic bag is 1 ℃, and transporting under the condition that the water temperature is 18 ℃; the road is rainy during transportation, and is covered for rain sheltering;
(4) and (3) seed putting: putting the seedlings with the same specification in the same pond, and putting the seedlings with the same specification in the same pond, wherein the stocking density is 4000 tails/m 2 When the seedlings are put into the culture pond, the difference between the temperature of water in the transportation plastic bags filled with the seedlings and the temperature of the water in the culture pond is adjusted to be 1 ℃; the depth of the seedling bed is 2cm, and the position for putting the seedlings is close to a concealed object, so that the seedlings can be concealed as soon as possible; after the seedlings are put into the pond, splashing bags are splashed in the whole pondThe membrane vitamin C has anti-stress effect, and the dosage is 2g/m 3 ；
(5) Fry training: the fry is divided into three growth stages of black fry, young eels and young eels for food training; the method comprises the following specific steps:
firstly, taking red nematodes as main materials of black young seedlings, and adding a mixture of earthworm meat paste and fish meat paste in a ratio of 1:1 as auxiliary materials; feeding the black seedlings by domesticating live red line worms for 1 day, sterilizing and repelling insects, and selecting young live red line worms by using a 30-mesh bolting silk screen for feeding so as to ensure that the bait is palatable and fresh;
secondly, the young eels are mainly mixed with the mixture of earthworm meat paste and fish meat paste in a ratio of 1:1, and are supplemented with red nematodes and feed;
thirdly, the young eel is mainly mixed with feed, earthworm meat and fish meat in a ratio of 1:1:1, and is supplemented with feed;
feeding for 1 time every day, wherein the daily feeding amount is 2 percent of the total weight of each seedling, and 5 feeding points are arranged; after feeding each seedling for 10 minutes, checking the feeding condition of the seedling to adjust the type, the proportion and the daily feeding amount of the fed feed;
(6) daily management of the culture pond: during cultivation, the cultivation is carried out by adopting a mode of feeding water into the bottom of the pond and blowing air from the surface of the pond, the cultivation water temperature is 18 ℃, the temperature difference between the water temperature in the pond and the air temperature on the water surface of the pond is kept to be 1 ℃, the pH value is 5.5, the dissolved oxygen is 3.5mg/L, the ammonia nitrogen is less than 0.8mg/L, and the nitrite is 0.05 mg/L; after feeding the feed for 1 hour, changing water in a bottom discharge and bottom feed mode, and controlling the water inlet and discharge amount to discharge residual baits and excrement in the pond, so that the seedlings do not leave hidden objects; after 30 days of cultivation, carrying out specification classification cultivation, wherein the specification of the classification cultivation is more than or equal to 5cm and less than or equal to 7cm and 7cm<Specification of<The specification is 10cm, 10cm and less than or equal to<15cm and the specification of more than or equal to 15cm are screened, the seedlings with the same specification are put together for cultivation, and the average stocking density is 2500 tails/m 2 1800 tail/m 2 1400 tail/m 2 1000 tail/m 2 Adjusting the depth of the seedling bed in water according to corresponding specifications, wherein the depth is respectively 4cm, 5cm and 6cm, and ensuring that the seedlings can comfortably swallow air; changing the concealed matters once every 5 days, and disinfecting and airing the changed concealed matters by using 5% saline solution for later use; the pond is patrolled 3 times every day, and problems are timely treated when being found；
(7) Harvesting young eels: after 3 months of cultivation, namely 2019, 9, 2 days, the survival rate of the finless eel fries is 96.8 percent, the average total length reaches 17cm, and the average weight can reach 6g, so that the finless eel fries can be harvested; when the young eels are harvested, receiving tools such as plastic basins, barrels or fishing nets are firstly placed at the collecting pipe openings of the culture ponds, the drainage switch is turned on, so that the young eels flow into the receiving tools and then are moved into the culture ponds or the transportation devices.
Example 3
As shown in fig. 1, the breeding bed of the finless eel fry indoor culture frame comprises a structural support frame 1, a net layer 2 and a concealed object 3; the structural support frame 1 is a square frame and is detachably connected with the net layer 2 at the bottom of the square frame to form a cube; the concealment object 3 is arranged on the upper surface of the net layer 2; the net layer 2 is a plastic net sheet with a mesh of 2 cm; the structural support frame 1 is formed by connecting two structural support frames side by side; the structural support frame 1 is made of a batten or a plastic pipe; the height of the wood strip is 10cm, and the width of the wood strip is 5 cm; the diameter of the plastic tube is 5 cm; the concealed object 3 is a waterproof and corrosion-resistant imitation float grass plastic belt with the diameter of 2cm and the length of 20 cm; the concealing objects 3 are formed by bundling nontoxic and tasteless green plastic belts which are heavier than water and easy to clean, and the width of each plastic belt is 0.8 cm.
A method for culturing finless eel fries by using an indoor finless eel fry culture frame seedling bed comprises the following steps:
(1) the culture pond is arranged: arranging a cubic frame seedling bed in a culture pond made of indoor plastic plates, wherein the area of the seedling bed accounts for 1/2 of the area of the culture pond; the hidden objects on the net layer of the seedling bed are hung on the structural support frame of the seedling bed or the side of the culture pond, the culture pond is internally provided with an accessory facility which is a pneumatic device and consists of a batch of inflatable insertion pipes, the outer diameter of each inflatable insertion pipe is 1cm, the length of each inflatable insertion pipe is based on each point extending to the bottom of the culture pond, and the pipe distribution density is 2 pipes/m 2 The branch pipe 1 is put into the bottom of the pool below the net bed to be inflated, and the branch pipe 1 is hung at the side of the pool to blow air into the pool; after the seedling bed is arranged, disinfecting the whole culture pond, introducing sand-filtered fresh water according to the specification of the seedlings, controlling the seedling bed to sink and float by a rope to enable the water level to be higher than that of the culture pondThe layer surface of the seedbed net is 6 cm;
(2) seed selection: selecting strong and disease-free finless eel fries with lost yolk sac and bright body color in Qinzhou Guangxi 10 days in 2020; the rice field eel fries comprise black fries, young eels and young eels; the total length of the black fries is 6cm, the total length of the young eels is 10cm, and the total length of the young eels is 15 cm;
(3) and (3) seed transportation: filling the plastic bags in a pot with the length of 70cm, the width of 44cm and the depth of 17cm, adding water, putting seedlings and hidden objects in the plastic bags, and transporting the seedlings after adding a breathable cover; the density of the transported seedlings is 5 ten thousand tails/m 2 Stopping feeding for 1-2 days before transportation, filling 1/2 water in the plastic bag during transportation, wherein the temperature difference between the water in the original seedling pond and the water in the plastic bag is 2 ℃, and transporting at the water temperature of 28 ℃; the road is rainy during transportation, and the rain is covered;
(4) seed putting: putting the seedlings with the same specification in the same pond, and stocking the seedlings with the stocking density of 5000 tails/m 2 When the seedlings are put into the culture pond, adjusting the difference between the temperature of water in the transportation plastic bags filled with the seedlings and the temperature of the water in the culture pond to be 2 ℃; the depth of the seedling bed is 3cm, and the position for putting the seedlings is close to a concealed object, so that the seedlings can be concealed as soon as possible; after the seedlings are put into the pond, splashing the coated vitamin C in the whole pond for resisting stress, wherein the dosage is 3g/m 3 ；
(5) Fry training: the fry is divided into three growth stages of black fry, young eels and young eels for food training; the method comprises the following specific steps:
firstly, taking red nematodes as main materials of the black young seedlings, and assisting with a mixture of earthworm minced meat and minced fish meat with a ratio of 2: 1; feeding the black larvae by using living red line worms for initial feeding domestication, wherein the living red line worms need to be temporarily cultured for 2 days, and are subjected to sterilization and insect repelling treatment, and the young living red line worms are selected by using a bolting silk mesh screen of 30-50 meshes for feeding, so that the palatable and fresh bait is ensured;
secondly, the young eels are mainly mixed with the mixture of earthworm meat paste and fish meat paste in a ratio of 1:1, and are supplemented with red nematodes and feed;
thirdly, the young eel is mainly mixed with feed, earthworm meat and fish meat in a ratio of 2:1:1, and is supplemented with feed;
feeding for 2 times every day, wherein the daily feeding amount is 3 percent of the total weight of each seedling, and 6 feeding points are set; after feeding each seedling for 15 minutes, checking the feeding condition of the seedling to adjust the type, the proportion and the daily feeding amount of the fed feed;
(6) daily management of the culture pond: during cultivation, the cultivation is carried out by adopting a mode of feeding water into the bottom of the pond and blowing air from the surface of the pond, the cultivation water temperature is 18-32 ℃, the temperature of the water in the pond of the cultivation pond is kept to be the same as the temperature of the water surface of the pond, the pH value is 6.5, the dissolved oxygen is more than 4.0mg/L, the ammonia nitrogen is 0.5mg/L, and the nitrite is 0.02 mg/L; after 2 hours of feeding, changing water by adopting a bottom discharge and bottom feed mode, and controlling the water inlet and discharge amount to discharge residual baits and excrement in the pond, so that the seedlings do not leave hidden objects; after culturing for 45 days, carrying out specification classification culture according to specification of not less than 5cm and not more than 7cm and 7cm<Specification of<The specification is 10cm, 10cm and less than or equal to<The seeds with the same specification are put together and cultivated by a 15cm and more than or equal to 15cm sieve, and the average stocking density is 2800 tails/m 2 2000 tail/m 2 1300 tail/m 2 1000 tail/m 2 Adjusting the depth of the seedling bed in water according to corresponding specifications, wherein the depth is respectively 4cm, 5cm and 6cm, and ensuring that the seedlings can comfortably swallow air; changing the concealed matters every 7 times, and disinfecting and airing the changed concealed matters by using 5% saline solution for later use; the pond is patrolled 3-4 times every day, and problems are timely treated;
(7) harvesting young eels: after 4 months of cultivation, namely 9 months and 10 days in 2019, the survival rate of the finless eel fries is 97.2 percent, the average total length can reach 18cm, and the average weight can reach 7g, so that the finless eel fries can be harvested; when the young eels are harvested, receiving tools such as plastic basins, barrels or fishing nets are firstly placed at the collecting pipe openings of the culture ponds, the drainage switch is turned on, so that the young eels flow into the receiving tools and then are moved into the culture ponds or the transportation devices.
Example 4
As shown in fig. 1, the breeding bed of the finless eel fry indoor culture frame comprises a structural support frame 1, a net layer 2 and a concealed object 3; the structural support frame 1 is a square frame and is detachably connected with the net layer 2 at the bottom of the square frame to form a cube; the concealment object 3 is arranged on the upper surface of the net layer 2; the net layer 2 is a plastic net sheet with a mesh of 1.5 cm; the structural support frame 1 is formed by connecting two structural support frames side by side; the structural support frame 1 is made of a batten or a plastic pipe; the height of the wood strip is 8cm, and the width of the wood strip is 4 cm; the diameter of the plastic tube is 3 cm; the concealed object 3 is a waterproof and corrosion-resistant imitation aquatic weed plastic belt with the diameter of 1.5cm and the length of 18 cm; the concealment object 3 is formed by bundling non-toxic and odorless green plastic belts which are slightly heavier than water and easy to clean, and the width of each plastic belt is 0.5 cm.
A method for culturing finless eel fries by utilizing an indoor culturing frame seedling bed of the finless eel fries comprises the following steps:
(1) the culture pond is arranged: arranging a cubic frame seedling bed in a culture pond made of indoor plastic plates, wherein the area of the seedling bed accounts for 1/2 of the area of the culture pond; the hidden objects on the net layer of the seedling bed are hung on the structural support frame of the seedling bed or the side of the culture pond, the culture pond is internally provided with an accessory facility which is a pneumatic device and consists of a batch of inflatable insertion pipes, the outer diameter of each inflatable insertion pipe is 0.8cm, the length of each inflatable insertion pipe is determined by each point extending to the bottom of the culture pond, and the pipe arrangement density is 2 pipes/m 2 The branch pipe 1 is put into the bottom of the pool below the net bed to be inflated, and the branch pipe 1 is hung at the side of the pool to blow air into the pool; after the seedling bed is arranged, disinfecting the whole culture pond, introducing sand-filtered fresh water according to the specification of seedlings, controlling the depth of the pond to be 20cm, and controlling the seedling bed to sink and float through a rope so that the water level is 4cm higher than the net layer of the seedling bed;
(2) seed selection: selecting healthy and healthy finless eel fries with no diseases, lost yolk sacs and bright body color in Qinzhou Guangxi 15 days in 2020; the rice field eel fries comprise black fries, young eels and young eels; the total length of the black fries is 5cm, the total length of the young eels is 8cm, and the total length of the young eels is 12 cm;
(3) and (3) seed transportation: filling the plastic bags in a pot with the length of 70cm, the width of 44cm and the depth of 17cm, adding water, putting seedlings and hidden objects in the plastic bags, and transporting the seedlings after adding a breathable cover; the density of the transported seedlings is 4 ten thousand tails/m 2 Stopping feeding for 2 days before transportation, filling 1/2 water with the volume of a plastic bag during transportation, wherein the temperature of the water in the original seedling planting pool is the same as that of the water in the plastic bag, and transporting the water at the temperature of 25 ℃; the road is rainy during transportation, and the rain is covered;
(4) seed putting: putting the seedlings with the same specification in the same pond, and stocking the seedlings with the stocking density of 5000 tails/m 2 Regulating water in plastic transportation bags containing seedlings when the seedlings are put into a culture pondThe temperature is the same as the water temperature of the culture pond; the depth of the seedling bed is 3cm, and the position for putting the seedlings is close to a concealed object, so that the seedlings can be concealed as soon as possible; after the seedlings are put into the pond, the coated vitamin C is sprinkled on the whole pond to resist stress, and the dosage is 3g/m 3 ；
(5) Fry training: the fry is divided into three growth stages of black fry, young eels and young eels for food training; the method comprises the following specific steps:
firstly, taking red nematodes as main materials of the black young seedlings, and assisting with a mixture of earthworm minced meat and minced fish meat with a ratio of 2: 1; feeding the black seedlings by domesticating the food and selecting the live red line worms, wherein the live red line worms need to be temporarily cultured for 2 days, and are subjected to sterilization and insect repelling treatment, and the young live red line worms are selected by a silk screen mesh with 40 meshes for feeding, so that the palatable and fresh bait is ensured;
secondly, the young eels are mainly mixed with the mixture of earthworm meat paste and fish meat paste in a ratio of 2:1, and are supplemented with red nematodes and feed;
thirdly, the young eel is mainly mixed with feed, earthworm meat and fish meat in a ratio of 2:1:1, and is supplemented with feed;
feeding for 2 times every day, wherein the daily feeding amount is 3 percent of the total weight of each seedling, and 5 feeding points are arranged; after feeding each seedling for 20 minutes, checking the feeding condition of the seedling to adjust the type, the proportion and the daily feeding amount of the fed feed;
(6) daily management of the culture pond: during cultivation, the cultivation is carried out by adopting a mode of feeding water into the bottom of the pond and blowing air from the surface of the pond, the cultivation water temperature is 18-32 ℃, the temperature of the water in the pond and the temperature of the water surface of the pond are kept the same, the pH value is 5.8, the dissolved oxygen is more than 4.2mg/L, the ammonia nitrogen is 0.5mg/L, and the nitrite is 0.02 mg/L; after feeding the feed for 1 hour, changing water in a bottom discharge and bottom feed mode, and controlling the water inlet and discharge amount to discharge residual baits and excrement in the pond, so that the seedlings do not leave hidden objects; culturing for 35 days, and performing specification classification culture according to specification of 5 cm-7 cm, 7cm<Specification of<Specification of 10cm, 10cm and less than or equal to<15cm and the specification of more than or equal to 15cm are screened, the seedlings with the same specification are put together for cultivation, and the average stocking density is 2500 tails/m 2 2000 tail/m 2 1500 tailed/m 2 1000 tail/m 2 And adjusting the depth of the seedling bed in water according to corresponding specifications, wherein the depth is respectively 4cm, 5cm and 6cm, so as to ensure the seedlingsThe seeds can swallow air comfortably; changing the concealed matters once every 6 days, and disinfecting and airing the changed concealed matters by using 5% saline solution for later use; the pool inspection is carried out 3 times every day, and problems are found and processed in time;
(7) harvesting young eels: after 2 months of cultivation, namely 8 months and 15 days in 2020, the survival rate of the finless eel fries is 96.3 percent, the average total length reaches 16cm, and the average weight reaches 6g, and then the finless eel fries can be harvested; when the young eels are harvested, receiving tools such as plastic basins, barrels or fishing nets are placed at the collecting pipe openings of the culture ponds, the drainage switches are opened, the young eels flow into the receiving tools, and then the young eels are moved into the culture ponds or the transportation devices.
Example 5
As shown in fig. 1, the breeding bed of the finless eel fry indoor culture frame comprises a structural support frame 1, a net layer 2 and a concealed object 3; the structural support frame 1 is a square frame and is detachably connected with the net layer 2 at the bottom of the square frame to form a cube; the concealment object 3 is arranged on the upper surface of the net layer 2; the net layer 2 is a plastic net sheet with a mesh of 2 cm; the structural support frame 1 is formed by connecting three side by side; the structural support frame 1 is made of a batten or a plastic pipe; the height of the wood strip is 8cm, and the width of the wood strip is 4 cm; the diameter of the plastic tube is 5 cm; the concealed object 3 is a waterproof and corrosion-resistant imitation float grass plastic belt with the diameter of 2cm and the length of 20 cm; the concealment object 3 is formed by bundling non-toxic and odorless green plastic belts which are slightly heavier than water and easy to clean, and the width of each plastic belt is 0.4 cm.
A method for culturing finless eel fries by utilizing an indoor culturing frame seedling bed of the finless eel fries comprises the following steps:
(1) the culture pond is arranged: arranging a cubic frame seedling bed in a culture pond made of indoor plastic plates, wherein the area of the seedling bed accounts for 1/3 of the area of the culture pond; the hidden objects on the net layer of the seedling bed are hung on the structural support frame of the seedling bed or the side of the culture pond, the culture pond is internally provided with an accessory facility which is a pneumatic device and consists of a batch of inflatable insertion pipes, the outer diameter of each inflatable insertion pipe is 1cm, the length of each inflatable insertion pipe is based on each point extending to the bottom of the culture pond, and the pipe distribution density is 2 pipes/m 2 The branch pipe 1 is put into the bottom of the pool below the net bed to be inflated, and the branch pipe 1 is hung at the side of the pool to blow air into the pool; seedling raising bedAfter the placement is finished, disinfecting the whole culture pond, introducing sand-filtered fresh water according to the specification of the seedlings, controlling the water depth of the pond to be 20cm, and controlling the seedling bed to float and sink through ropes so that the water level is 6cm higher than the net layer of the seedling bed;
(2) seed selection: selecting strong and disease-free finless eel fries with lost yolk sac and bright body color in Qinzhou Guangxi 3.7.2020; the rice field eel fries comprise black fries, young eels and young eels; the total length of the black fries is 4cm, the total length of the young eels is 10cm, and the total length of the young eels is 12 cm;
(3) and (3) fry transportation: filling the plastic bags in a pot with the length of 70cm, the width of 44cm and the depth of 17cm, adding water, putting seedlings and hidden objects in the plastic bags, and transporting the seedlings after adding a breathable cover; the density of the transported seedlings is 2 ten thousand tails/m 2 Stopping feeding for 2 days before transportation, filling water according to 1/3 of the volume of the plastic bag during transportation, wherein the temperature difference between the water in the original seedling seed pool and the water in the plastic bag is 2 ℃, and transporting under the condition that the water temperature is 28 ℃; the road is rainy during transportation, and is covered for rain sheltering;
(4) seed putting: putting the seedlings with the same specification in the same pond, wherein the stocking density is 4500 tails/m 2 When the seedlings are put into the culture pond, the difference between the temperature of water in the transportation plastic bags filled with the seedlings and the temperature of the water in the culture pond is adjusted to be 1 ℃; the depth of the seedling bed is 2cm, and the position for putting the seedlings is close to a concealed object, so that the seedlings can be concealed as soon as possible; after the seedlings are put into the pond, splashing coated vitamin C in the whole pond to resist stress, wherein the dosage is 3g/m 3 ；
(5) Fry training: the fry is divided into three growth stages of black fry, young eels and young eels for food training; the method comprises the following specific steps:
firstly, taking red nematodes as main materials of black young seedlings, and adding a mixture of earthworm meat paste and fish meat paste in a ratio of 2: 1; feeding the black seedlings by domesticating the food and selecting the live red line worms, wherein the live red line worms need to be temporarily cultured for 1 day, and are subjected to sterilization and insect repelling treatment, and the young live red line worms are selected by a 30-mesh bolting silk mesh screen for feeding, so that the palatable and fresh bait is ensured;
secondly, the young eels are mainly mixed with the mixture of earthworm meat paste and fish meat paste in a ratio of 2:1, and are supplemented with red nematodes and feed;
thirdly, the young eel is mainly mixed with feed, earthworm meat and fish meat in a ratio of 1:1:1, and is supplemented with feed;
feeding for 2 times every day, wherein the daily feeding amount is 3 percent of the total weight of each seedling, and 6 feeding points are set; after each seedling is fed for 20 minutes, the ingestion condition of the seedling is checked so as to adjust the type, the proportion and the daily feeding amount of the fed feed;
(6) daily management of the culture pond: during cultivation, the cultivation is carried out by adopting a mode of feeding water into the bottom of the pond and blowing air from the surface of the pond, the cultivation water temperature is 25 ℃, the temperature difference between the water temperature in the pond and the air temperature on the water surface of the pond is kept to be 1 ℃, the pH value is 5.5, the dissolved oxygen is more than 3.8mg/L, the ammonia nitrogen is 0.5mg/L, and the nitrite is 0.05 mg/L; after 2 hours of feeding, changing water by adopting a bottom discharge and bottom feed mode, and controlling the water inlet and discharge amount to discharge residual baits and excrement in the pond, so that the seedlings do not leave hidden objects; after 40 days of cultivation, carrying out specification classification cultivation, wherein the specification of the classification cultivation is more than or equal to 5cm and less than or equal to 7cm and 7cm<Specification of<The specification is 10cm, 10cm and less than or equal to<15cm and the specification of more than or equal to 15cm are screened, the seedlings with the same specification are put together for cultivation, and the average stocking density is 3000 tails/m 2 2500 tail/m 2 2000 tail/m 2 1000 tail/m 2 Adjusting the depth of the seedling bed in water according to corresponding specifications, wherein the depth is respectively 4cm, 5cm and 6cm, and ensuring that the seedlings can comfortably swallow air; changing the concealed matters every 7 times, and disinfecting and airing the changed concealed matters by using 5% saline solution for later use; the pool inspection is carried out 3 times every day, and problems are found and processed in time;
(7) harvesting young eels: after 3 months of cultivation, namely 10 months and 3 days in 2020, the survival rate of the finless eel fries is 96.7 percent, the average total length reaches 18cm, and the average weight reaches 7g, and then the finless eel fries can be harvested; when the young eels are harvested, receiving tools such as plastic basins, barrels or fishing nets are firstly placed at the collecting pipe openings of the culture ponds, the drainage switch is turned on, so that the young eels flow into the receiving tools and then are moved into the culture ponds or the transportation devices.
Example 6
As shown in fig. 1, the indoor finless eel fry culture frame seedling culture bed comprises a structural support frame 1, a net layer 2 and a concealed object 3; the structural support frame 1 is a square frame and is detachably connected with the net layer 2 at the bottom of the square frame to form a cube; the concealment object 3 is arranged on the upper surface of the net layer 2; the net layer 2 is a plastic net sheet with a mesh of 2 cm; the structural support frame 1 is formed by connecting three side by side; the structural support frame 1 is made of a batten or a plastic pipe; the height of the wood strip is 5cm, and the width of the wood strip is 5 cm; the diameter of the plastic tube is 2 cm; the concealed object 3 is a waterproof and corrosion-resistant imitation float grass plastic belt with the diameter of 2cm and the length of 18 cm; the concealment object 3 is formed by bundling non-toxic and odorless green plastic belts which are slightly heavier than water and easy to clean, and the width of each plastic belt is 0.8 cm.
A method for culturing finless eel fries by utilizing an indoor culturing frame seedling bed of the finless eel fries comprises the following steps:
(1) the culture pond is arranged: arranging a cubic frame seedling bed in a culture pond made of indoor plastic plates, wherein the area of the seedling bed accounts for 1/2 of the area of the culture pond; the hidden objects on the net layer of the seedling bed are hung on the structural support frame of the seedling bed or the side of the culture pond, the culture pond is internally provided with an accessory facility which is a pneumatic device and consists of a batch of inflatable insertion pipes, the outer diameter of each inflatable insertion pipe is 0.8cm, the length of each inflatable insertion pipe is determined by each point extending to the bottom of the culture pond, and the pipe arrangement density is 2 pipes/m 2 The branch pipe 1 is put into the bottom of the pool below the net bed to be inflated, and the branch pipe 1 is hung at the side of the pool to blow air into the pool; after the seedling bed is arranged, disinfecting the whole culture pond, introducing sand-filtered fresh water according to the specification of seedlings, wherein the depth of the pond is 20cm, and controlling the seedling bed to sink and float through ropes so that the water level is 6cm higher than the net layer of the seedling bed;
(2) seed selection: selecting strong and disease-free finless eel fries with lost yolk sacs and bright body color in Qinzhou Guangxi 22 months in 2020; the rice field eel fries comprise black fries, young eels and young eels; the total length of the black fries is 6cm, the total length of the young eels is 10cm, and the total length of the young eels is 10 cm;
(3) and (3) seed transportation: filling the plastic bags in a pot with the length of 70cm, the width of 44cm and the depth of 17cm, adding water, putting seedlings and hidden objects in the plastic bags, and transporting the seedlings after adding a breathable cover; the density of the transported seedlings is 1 ten thousand pieces/m 2 Stopping feeding for 1 day before transportation, filling water according to 1/3 of the volume of the plastic bag during transportation, wherein the temperature difference between the water in the original seedling seed pool and the water in the plastic bag is 2 ℃, and transporting under the condition that the water temperature is 18 ℃; the road is rainy during transportation, and the rain is covered;
(4) seed putting: the same isThe seedlings with the same specification are put into each pond, and the stocking density is 4500 tails/m 2 When the seedlings are put into the culture pond, adjusting the temperature of water in the transportation plastic bags filled with the seedlings to be the same as the water temperature of the culture pond; the depth of the seedling bed is 3cm, and the position for putting the seedlings is close to a concealed object, so that the seedlings can be concealed as soon as possible; after the seedlings are put into the pond, splashing coated vitamin C in the whole pond to resist stress, wherein the dosage is 3g/m 3 ；
(5) Fry training: the fry is divided into three growth stages of black fry, young eels and young eels for food training; the method comprises the following specific steps:
firstly, taking red nematodes as main materials of the black young seedlings, and assisting with a mixture of earthworm minced meat and minced fish meat with a ratio of 2: 1; feeding the black seedlings by domesticating live red line worms for 2 days, sterilizing and repelling insects, and selecting the young live red line worms by using a bolting silk screen of 50 meshes for feeding so as to ensure that the bait is palatable and fresh;
secondly, the young eels are mainly mixed with the mixture of earthworm meat paste and fish meat paste in a ratio of 2:1, and are supplemented with red nematodes and feed;
thirdly, the young eel is mainly mixed with feed, earthworm meat and fish meat in a ratio of 2:1:1, and is supplemented with feed;
feeding for 1 time every day, wherein the daily feeding amount is 2% of the total weight of each seedling, and 8 feeding points are set; after each seedling is fed for 20 minutes, the ingestion condition of the seedling is checked so as to adjust the type, the proportion and the daily feeding amount of the fed feed;
(6) daily management of the culture pond: during cultivation, the cultivation is carried out by adopting a mode of feeding water into the bottom of the pond and blowing air from the surface of the pond, the temperature of cultivation water is 32 ℃, the temperature of the water in the pond and the temperature of the water surface of the pond are kept the same, the pH value is 5.6, the dissolved oxygen is 4.5mg/L, the ammonia nitrogen is 0.4mg/L, and the nitrite is 0.03 mg/L; after 2 hours of feeding, changing water by adopting a bottom discharge and bottom feed mode, and controlling the water inlet and discharge amount to discharge residual baits and excrement in the pond, so that the seedlings do not leave hidden objects; after culturing for 45 days, carrying out specification classification culture according to specification of not less than 5cm and not more than 7cm and 7cm<Specification of<The specification is 10cm, 10cm and less than or equal to<15cm and the specification of more than or equal to 15cm are screened, the seedlings with the same specification are put together for cultivation, and the average stocking density is 2200 tails/m 2 1800 tail/m 2 1500 tailed/m 2 1000 tail/m 2 The depth of the seedling bed in water is adjusted according to corresponding specifications, and the depth is respectively 4cm, 5cm and 6cm, so that the seedlings can be ensured to comfortably swallow air; changing the concealed matters every 7 times, and disinfecting and airing the changed concealed matters by using 5% saline solution for later use; the pool inspection is carried out for 4 times every day, and problems are found and processed in time;
(7) harvesting young eels: after 2 months of cultivation, namely 9 months and 22 days in 2020, the survival rate of the finless eel fries is 96.8 percent, the average total length reaches 16cm, and the average weight reaches 6g, and then the finless eel fries can be harvested; when the young eels are harvested, receiving tools such as plastic basins, barrels or fishing nets are firstly placed at the collecting pipe openings of the culture ponds, the drainage switch is turned on, so that the young eels flow into the receiving tools and then are moved into the culture ponds or the transportation devices.
Comparative example 1
The difference between the comparative example 1 and the example 1 is that the culture pond of the comparative example 1 is arranged outdoors, a culture net cage is arranged in the culture pond, hidden objects in the culture net cage are water hyacinth, and other conditions are the same as those in the example 1. The finless eel fries are cultivated according to the method of the comparative example, the cultivation survival rate is 82.5 percent, the average total length of the fries reaches 14cm, and the average weight reaches 5 g.
Comparative example 2
The difference between the comparative example 2 and the example 1 is that a cultivation net cage is arranged in the cultivation pond of the comparative example 2, hidden objects in the cultivation net cage are water hyacinth, and other conditions are the same as those in the example 1. The finless eel fries are cultivated according to the method of the comparative example, the cultivation survival rate is 58.3 percent, the average total length of the fries reaches 12cm, and the average weight reaches 4 g.
The survival rate, average full length and average body weight of the finless eel fry rearing in examples 1 to 6 and comparative examples 1 and 2 were counted, as shown in table 1.
TABLE 1
Figure BDA0002823470510000151
As can be seen from Table 1, the survival rate of the finless eel fries cultured by the method for culturing the finless eel fries in the indoor water pool is over 96.3 percent, the average total length is over 16cm, and the average weight is over 6 g. Compared with the data of the example 1 and the comparative example 1, the survival rate of the finless eel fries cultivated by the method is improved by 18.2 percent, the average full length is improved by 35.7 percent, and the average weight is improved by 60 percent. The situation that the breeding net cages used in the comparative examples can not ensure enough rest platforms and avoiding spaces of the finless eels, so that the finless eels can not grow well is shown, and the survival rate is lower than that of the method because the finless eel fries are easy to be affected by factors such as external environment, temperature and the like and have stress reaction when the breeding pond is arranged outdoors.
From the data of the comparative example 2, the survival rate of the finless eel fries of the comparative example 2 is only 58.3%, and the average total length and the average body weight are also lower than those of the example 1 of the invention. The method shows that the hidden objects of plants such as water hyacinth and the like are arranged indoors, the plants are easy to decay to pollute water quality, so that the growth and development of the finless eel fries are influenced, and the survival rate and the individual specification are reduced.
The finless eel fry cultivated by the method has the advantages of high survival rate, regular specification, high growth speed, convenient cultivation and management, low cost, realization of large-scale cultivation of finless eel fries and good application prospect.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and the like that are within the spirit and principle of the present invention are included in the present invention.

Claims (5)

1. A method for culturing finless eel fries by utilizing an indoor culturing frame seedling bed of the finless eel fries is characterized by comprising the following steps:
(1) the culture pond is arranged: arranging a seedling bed in the culture pond, wherein the area of the seedling bed accounts for 1/3-1/2 of the area of the culture pond; the concealed objects on the net layer of the seedling bed are hung on a structural support frame of the seedling bed or at the edge of a culture pond, and an auxiliary facility is installed in the culture pond, is a pneumatic device and consists of a batch of inflatable insertion tubes; after the seedling bed is arranged, disinfecting the whole culture pond, introducing fresh water according to the specification of seedlings, and controlling the seedling bed to sink and float to enable the water level to be higher than the net layer surface; the seedling raising bed comprises a structure support frame, a net layer and a concealed object; the structural support frame is a square frame and is detachably connected with the net layer at the bottom of the square frame to form a cube; the concealment object is arranged on the upper surface of the net layer; the net layer is a plastic net sheet with the mesh of 0.8-2 cm; the concealed object is a waterproof and corrosion-resistant imitation float grass plastic belt with the diameter of 1.5-2cm and the length of 15-20 cm;
(2) seed selection: selecting healthy and healthy finless eel fries with disappearance of yolk sacs and bright body color; the rice field eel fries comprise black fries, young eels and young eels; the total length of the black fries is 3-6cm, the total length of the young eels is 6-10cm, and the total length of the young eels is 10-15 cm;
(3) seed putting: putting the seedlings with the same specification, and adjusting the temperature of water in the transportation plastic bags filled with the seedlings and the temperature of the water in the culture pond to be not more than 2 ℃ when putting the seedlings into the culture pond; the position for putting the seedlings is close to the concealed object, and after the seedlings are put into the pond, anti-stress substances are sprinkled on the whole pond;
(4) fry training: the fry is divided into three growth stages of black fry, young eels and young eels for food training; the method comprises the following specific steps:
firstly, taking red nematodes as main materials of the black young seedlings, and adding a mixture of earthworm minced meat and minced fish meat; feeding live red nematode for domesticating the black seedlings at the initial stage to ensure the palatability and freshness of the bait; the mixture ratio of the earthworm meat paste and the fish meat paste for the black young seedlings is 1-2: 1;
secondly, the young eels are mainly mixed with earthworm meat paste and fish meat paste, and are supplemented with red nematodes and feed; the ratio of the earthworm meat paste to the fish meat paste mixture which is eaten by the young eels is 1-2: 1;
thirdly, the young eel is mainly prepared from feed, earthworm meat and fish meat; the ratio of the feed for young eel to the earthworm meat to the fish meat mixture is 1-2:1: 1;
feeding for 1-2 times every day, wherein the daily feeding amount is 2-3% of the total weight of each seedling, and 5-8 feeding points are set; after feeding each seedling for 10-20 minutes, checking the ingestion condition of the seedling to adjust the type, proportion and daily feeding amount of the fed feed;
(5) daily management of the culture pond: during the cultivation period, the cultivation is carried out in a mode of feeding water into the pond bottom and blowing air to the pond surface, and the cultivation water temperature is 18-32 ℃; after feeding the feed for 1-2 hours, changing water in a bottom discharge and bottom feeding mode, and controlling the water feeding and discharging amount to discharge residual bait and excrement in the pond, so that the seedlings do not leave hidden objects; after 30-45 days of cultivation, carrying out specification classification cultivation, and adjusting the depth of a seedling bed in water according to corresponding specifications; changing the concealed matter every 5-7, and sterilizing and airing the changed concealed matter by using 5% saline solution for later use; the pond inspection is performed 3-4 times every day, and problems are found and timely treated;
(6) harvesting young eels: after 2-4 months of cultivation, the total length of the finless eel fries reaches more than 15cm, the weight reaches more than 5g, and then the finless eel fries can be harvested; when the young eels are harvested, the receiving tool is placed at the collecting pipe opening of the culture pond, the drainage switch is turned on, so that the young eels flow into the receiving tool, and then are moved into the culture pond or the transportation device.
2. The method for cultivating the finless eel fries by using the indoor finless eel fry cultivation frame seedling raising bed as claimed in claim 1, wherein in the step (4), the black fries are opened, fed with the selected live red nematodes for domestication and domestication for 1-2 days, sterilized and subjected to insect repellent treatment, and young live red nematodes are selected by using a 30-50-mesh bolting silk screen for feeding.
3. The method for cultivating the finless eel fries by using the indoor finless eel fry cultivation frame as claimed in claim 1, wherein in the step (5), the specification classification cultivation is that the finless eel fries with the same specification are put together and cultivated according to the screening of 5 cm-specification, 7 cm-specification, 10 cm-specification, 15 cm-specification and 15 cm-specification.
4. The method for cultivating the finless eel fries by using the indoor finless eel fry cultivation frame as claimed in claim 1, wherein in the step (1), the outer diameter of the tube of the air-filled intubation tube is 0.5-1cm, the length of the tube is based on each point extending to the bottom of the cultivation pond, and the tube distribution density is 2 tubes/m 2 The branch pipes 1 are put into the bottom of the pool below the net bed to be inflated, and the branch pipes 1 are hung at the side of the pool to blow air into the pool.
5. The method for cultivating the finless eel fries by using the indoor finless eel fry cultivation frame seedling bed as claimed in claim 1, wherein in the step (5), the difference between the temperature of water in the pond and the temperature of the water surface in the pond is not more than 2 ℃, the pH value is 5.5-6.8, the dissolved oxygen is more than 3.5mg/L, the ammonia nitrogen is less than 0.8mg/L, and the nitrite is less than 0.05 mg/L.
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