CN111602616A - Breeding method for trachinotus ovatus fries - Google Patents
Breeding method for trachinotus ovatus fries Download PDFInfo
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- CN111602616A CN111602616A CN202010589663.7A CN202010589663A CN111602616A CN 111602616 A CN111602616 A CN 111602616A CN 202010589663 A CN202010589663 A CN 202010589663A CN 111602616 A CN111602616 A CN 111602616A
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- pond
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- trachinotus ovatus
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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
- A01K61/17—Hatching, e.g. incubators
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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
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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
- A01K61/50—Culture of aquatic animals of shellfish
- A01K61/59—Culture of aquatic animals of shellfish of crustaceans, e.g. lobsters or shrimps
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- 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 cultivation method of trachinotus ovatus fries, which comprises the following steps: (1) cleaning and disinfecting a pond; (2) feeding water to culture algae; (3) inoculating rotifer and prawn seedling; (4) hatching fertilized eggs; (5) erecting a fry culturing net cage, wherein the primarily hatched trachinotus ovatus fry cannot pass through the fry culturing net cage, and algae and rotifer in the pond can pass in and out the fry culturing net cage; (6) net cage seedling culture: feeding rotifers to the primarily hatched trachinotus ovatus larvae in the fry raising net cages, feeding rotifers to the prawn larvae in the pond, feeding algae by the rotifers, and forming a small ecological balance system in the whole pond; (7) replacing the seedling net cage: gradually replacing the net cages of the large meshes according to the body length of the trachinotus ovatus larvae; (8) and (6) harvesting the seedlings. The culture method of the trachinotus ovatus fries utilizes the current prawn culture pond to culture the trachinotus ovatus fries while culturing the prawns, fully utilizes culture sites, facilities and manpower, and effectively reduces culture cost.
Description
Technical Field
The invention relates to the technical field of trachinotus ovatus fry breeding, in particular to a method for breeding trachinotus ovatus fries.
Background
Trachinotus ovatus (arch of Trachinotus ovatus)Trachinotus ovatus) Commonly known as golden pomfret, yellow pomfret, red pompano, etc., belonging to Perciformes, carangidae, trachinotus subfamily, Populus genus (trachinotus)Trachinotus) Widely distributed in the tropical and temperate waters of the pacific, atlantic and indian oceans. The fish has the advantages of large body size, fast growth, simple feeding property, tender and delicious meat, and is widely popular with farmers and consumers. The breeding technology is broken through, artificial compound feed can be used in the whole breeding process, and the export processing market is large. In recent years, the culture industry of the trachinotus ovatus is rapidly developed in China, and becomes one of the seawater fishes mainly cultured in net cages in coastal areas of south China, such as Guangdong, Guangxi, Hainan and the like, and the annual output of the culture in China is over 10 ten thousand tons since 2017. The fry demand is greatly increased, as with all seawater fishes, the calibers of the early fries of the trachinotus ovatus are smaller, the requirement on opening bait is stricter, the best and practical bait organisms at present are rotifers and copepods, but the large production of rotifers needs certain technology and field, and the algae for cultivating the rotifers needs larger field and water body for production, so the fry cultivation cost is higher, and the fry price is also high for a long time.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a low-cost trachinotus ovatus fry breeding method, which utilizes the existing prawn breeding pond to breed the trachinotus ovatus fries while breeding the prawns, fully utilizes breeding fields, facilities and manpower and effectively reduces the breeding cost.
The technical problem to be solved by the invention is realized by the following technical scheme:
a cultivation method of trachinotus ovatus fries comprises the following steps:
(1) cleaning and disinfecting a pond;
(2) feeding water to culture algae;
(3) inoculating rotifer and prawn seedling;
(4) hatching fertilized eggs: placing fertilized eggs of trachinotus ovatus in a hatching barrel for hatching;
(5) erecting a fry culturing net cage, wherein the primarily hatched trachinotus ovatus fry cannot pass through the fry culturing net cage, and algae and rotifer in the pond can pass in and out the fry culturing net cage;
(6) net cage seedling culture: feeding rotifers to the primarily hatched trachinotus ovatus larvae in the fry raising net cages, feeding rotifers to the prawn larvae in the pond, feeding algae by the rotifers, and forming a small ecological balance system in the whole pond;
(7) replacing the seedling net cage: gradually replacing the net cages of the large meshes according to the body length of the trachinotus ovatus larvae;
(8) and (6) harvesting the seedlings.
As a preferred embodiment of the method for cultivating trachinotus ovatus fries provided by the present invention, the step (1) specifically comprises: cleaning the pond, exposing the pond for 2-3 days in the sun, enabling the water inlet depth to be about 20-50 cm, sprinkling quicklime into the whole pond, enabling the usage amount of the quicklime to be 50-100 kg/mu, starting a waterwheel type aerator to stir the pond water, and enabling the disinfection to be uniform.
As a preferable embodiment of the cultivation method of trachinotus ovatus fries provided by the invention, the step (2) is specifically that after 3-5 days, the seawater subjected to sand filtration is continuously added to the depth of 2-2.5 m, the 10-11 am on a sunny day is selected to inoculate unicellular algae, algae auxin is splashed, and a waterwheel type aerator is started to stir the pond water to promote the growth of the algae.
As a preferred embodiment of the method for cultivating trachinotus ovatus fries provided by the present invention, the step (3) is specifically: when the water color of the pond is semitransparent algae color, inoculating rotifer, simultaneously sprinkling unicellular algae auxin every morning and starting an aerator to stir the pond water, and breeding prawn and shrimp fries after 3-5 days.
As a preferred embodiment of the method for cultivating trachinotus ovatus fries provided by the present invention, the step (4) specifically comprises: putting an incubation barrel at the side of the pond, adding sand-filtered seawater into the incubation barrel, putting fertilized eggs of trachinotus ovatus in the incubation barrel for incubation, wherein the incubation density of the fertilized eggs is 20-30 g/barrel, and inflating and oxygenating an air head in the barrel.
As a preferred embodiment of the method for cultivating trachinotus ovatus fries provided by the present invention, the step (5) specifically comprises: and erecting a fry raising net cage with a mesh of 80-100 meshes by using a buoy in the pond, connecting the bottom of the hatching barrel by using a hose, and discharging the hatched trachinotus ovatus fry into the fry raising net cage in the pond.
As a preferred embodiment of the method for cultivating trachinotus ovatus fry provided by the invention, the erecting of the fry culture cage is that at least one cage frame is erected in a pond by using a buoy, and a first netting is hung on the cage frame, wherein the mesh of the first netting is 80-100 meshes.
As a preferred embodiment of the method for cultivating trachinotus ovatus fries provided by the present invention, the step (6) is specifically: applying algae auxin, sunlight irradiation and aerator agitation to the pond to enable the monadian in the pond to propagate in a large quantity, feeding the monadian by rotifer, feeding rotifer by prawn larvae in the pond and feeding rotifer by primarily hatched pompano larvae in the seedling net cages, and forming a small ecological balance system in the whole pond.
As a preferred embodiment of the method for cultivating trachinotus ovatus fries provided by the present invention, the step (7) is specifically: after 5-7 days, the length of the pompano fry is 3-5 mm, and a first net cage with 40-60 meshes is replaced; inoculating copepods in the pond, feeding rotifers in the pond by the copepods, and feeding the copepods into a first net cage for feeding trachinotus ovatus fries; after 12-14 days, the pompano fry grows to a juvenile stage, a second net cage with 15-25 meshes is replaced, and the pompano meal together with frozen copepods or fairy shrimp and fresh water are beaten into cakes which float on the water surface for the fry to bite; most of pompano fry are transformed into juvenile fish after 20 days, and a third net cage with 4-6 meshes is replaced.
As a preferred embodiment of the method for cultivating trachinotus ovatus fry provided by the present invention, the first net cage, the second net cage and the third net cage are net cage frames on which netting of different meshes is hung.
The invention has the following beneficial effects:
the invention provides a low-cost culture method for trachinotus ovatus fries, which utilizes the current prawn culture pond to culture trachinotus ovatus fries while culturing prawns, fully utilizes culture sites, facilities and manpower, and effectively reduces culture cost. The invention makes full use of the advantages of abundant algae and bait organisms in the pond in the earlier stage of prawn culture, the net cages are erected in the pond for culturing the seeds of the trachinotus ovatus, the whole culturing process of the trachinotus ovatus seedlings only needs 1 month, and the prawn has small individual body in the early stage and does not need too large water space, so that the culturing of the prawn is not influenced by the culturing of the water body in the pond. The net does not need to be pulled after the seedlings are harvested, the fish seedlings are not easy to be injured, and the manpower is reduced.
Detailed Description
The present invention will be described in detail with reference to examples, which are only preferred embodiments of the present invention and are not intended to limit the present invention.
Example 1
The embodiment provides a cultivation method of trachinotus ovatus fries, which comprises the following steps:
(1) cleaning and disinfecting the pond.
The method is realized in the concrete way that a pond is cleaned up, the pond is exposed to the sun for 2 days, water is fed for 50cm, quicklime is splashed to the whole pond, the consumption of the quicklime is 80 kg/mu, and a waterwheel type aerator is started to stir the pond water so as to uniformly disinfect the pond.
(2) And feeding water to culture algae.
The specific implementation is that the seawater after sand filtration is continuously added to the depth of 2m after 3 days, unicellular algae are inoculated at 10-11 am in sunny days, algae auxin is splashed, a waterwheel type aerator is started to stir the pool water, and the growth of the algae is promoted.
(3) Inoculating rotifer and prawn seedling.
The method is realized in a concrete way that when the pond water color is gradually thickened, namely translucent algae color, rotifer is inoculated, meanwhile, monadian auxin is sprinkled every morning and an aerator is started to stir the pond water, and after 5 days, the penaeus monodon shrimp larvae are released and cultured, wherein the length of the penaeus monodon shrimp larvae is 0.9cm, and the releasing density is 30000 tails/mu.
(4) Hatching fertilized eggs: placing fertilized eggs of trachinotus ovatus in a hatching barrel for hatching.
The method is realized in a way that a hatching barrel is arranged beside a pond, the capacity of the hatching barrel is 500L, sand-filtered seawater is added into the barrel, fertilized eggs of the trachinotus ovatus are placed in the hatching barrel for hatching, the hatching density of the fertilized eggs is 30 g/barrel, and an air head is arranged in the barrel to inflate and oxygenate.
(5) Erecting a fry culturing net cage, wherein the fry of the newly hatched pompano cannot pass through the fry culturing net cage, and algae and rotifers in the pond can pass in and out the fry culturing net cage.
The method is realized in a way that cage frames are erected in a pond by using buoys, the specification of the frame is length multiplied by width =2m multiplied by 4m, a plurality of cage frames of the specification can be erected in one pond, netting of the corresponding specification is hung on the frame, the length multiplied by width multiplied by height =2m multiplied by 4m multiplied by 2m, and the mesh is 100 meshes, so that the carangia piniperis fry which is hatched initially can not pass through the netting and swim to the pond, and algae and rotifers in the pond can freely enter and exit the seedling raising cage. And connecting the bottom of the hatching barrel with a hose, opening a bottom gate, and discharging the hatched trachinotus ovatus into a fry culturing net cage in the pond.
(6) Net cage seedling culture: the larvae of the primarily hatched pompano ingests rotifers in the fry culture net cages, the shrimp larvae of the prawns in the pond ingest the rotifers, the rotifers ingest algae, and the whole pond forms a small ecological balance system.
The method is specifically realized in such a way that a large amount of unicellular algae in the pond are bred by applying algae auxin, sunlight irradiation and stirring of an aerator to the pond, the rotifer ingests the unicellular algae, the penaeus monodon in the pond and the trachinotus ovatus fry in the net cage ingest the rotifer, the whole pond forms a small ecological balance system, the rotifer density in the net cage is observed every day, and the feeding is timely carried out for supplement when the rotifer density is not enough.
(7) Replacing the seedling net cage: gradually replacing mesh net cages according to the body length of the trachinotus ovatus fry.
The specific implementation is that after 6 days from the beginning of seedling culture, trachinotus ovatus fries grow up obviously, the body length is about 5mm, the mesh of the original netting is small, the mesh is easy to be blocked by impurities in the pond to influence the flow of water inside and outside the net cage and the entrance of rotifers, the netting with larger mesh needs to be replaced at the moment, the netting with 50 meshes is replaced to form a first net cage, as the trachinotus ovatus fries grow up, ingestion objects are gradually transformed into bigger copepods from the rotifers, at the moment, the pond needs to be inoculated with copepods, and the copepods mainly ingest the rotifers in the pond, so that the replacement of the netting with larger mesh is also beneficial to the copepods to enter the net cage for the trachinotus ovatus fries to ingest.
After 12 days, the mesh of the netting is changed to be 25 meshes to form a second net cage, at the moment, the trachinotus ovatus fry is developed to a juvenile stage, the food intake is greatly increased, the bait organism copepods cannot meet the food intake requirement, and the eel meal and the frozen copepods or fairy shrimp and fresh water can be beaten into cakes and then float on the water surface for the fries to bite.
After 20 days, most of trachinotus ovatus fries are transformed into juvenile fishes full of scales, so that seedlings can emerge, and the trachinotus ovatus fries can be continuously raised, but the mesh net needs to be replaced to 4 meshes to form a third net cage.
(8) And (6) harvesting the seedlings.
The specific implementation is that after the fry is completely transformed into young fish about 25 days after cultivation, the net is pulled up to collect and transport the fry, and the fry can be transferred to other ponds for cultivation.
Example 2
The embodiment provides a cultivation method of trachinotus ovatus fries, which comprises the following steps:
(1) cleaning and disinfecting the pond.
The method is realized in the concrete way that a pond is cleaned up, the pond is exposed to the sun for 3 days, water is fed for 20cm, quicklime is splashed in the whole pond, the consumption of the quicklime is 100 kg/mu, and a waterwheel type aerator is started to stir the pond water so as to uniformly disinfect the pond.
(2) And feeding water to culture algae.
The specific implementation is that after 4 days, the seawater which is filtered by sand is continuously added to the depth of 2.5m, the 10-11 am on a sunny day is selected to inoculate unicellular algae, algae auxin is splashed, and a waterwheel type aerator is started to stir the pool water to promote the growth of the algae.
(3) Inoculating rotifer and prawn seedling.
The method is realized in a concrete way that when the pond water color is gradually thickened, namely translucent algae color, rotifer is inoculated, meanwhile, monadian auxin is sprinkled every morning and an aerator is started to stir the pond water, 4 days later, Chinese prawn fries are released, the length of the prawn fries is 0.8cm, and the releasing density is 40000 tails/mu.
(4) Hatching fertilized eggs: placing fertilized eggs of trachinotus ovatus in a hatching barrel for hatching.
The method is realized in a way that a hatching barrel is arranged at the side of the pond, the capacity of the hatching barrel is 1000L, sand-filtered seawater is added into the barrel, fertilized eggs of trachinotus ovatus are placed in the hatching barrel for hatching, the hatching density of the fertilized eggs is 25 g/barrel, and an air discharging head is arranged in the barrel to blow air and oxygenate.
(5) Erecting a fry culturing net cage, wherein the primarily hatched trachinotus ovatus fry cannot pass through the fry culturing net cage, and algae and rotifer in the pond can pass in and out the fry culturing net cage.
The method is realized in a way that cage frames are erected in a pond by using buoys, the specification of the frame is length multiplied by width = 3m multiplied by 6m, a plurality of cage frames of the specification can be erected in one pond, netting of the corresponding specification is hung on the frame, the length multiplied by width multiplied by height = 3m multiplied by 6m multiplied by 2m of the netting, and the mesh is 90 meshes, so that the carangid fry which are hatched for the first time can not pass through the netting and swim to the pond, and algae and rotifers in the pond can freely enter and exit the seedling raising cage. And connecting the bottom of the hatching barrel with a hose, opening a bottom gate, and discharging the hatched trachinotus ovatus into a fry culturing net cage in the pond.
(6) Net cage seedling culture: the larvae of the primarily hatched pompano ingests rotifers in the fry culture net cages, the shrimp larvae of the prawns in the pond ingest the rotifers, the rotifers ingest algae, and the whole pond forms a small ecological balance system.
The specific implementation is that applying algae auxin, sunlight irradiation and aerator agitation to the pond to propagate a large amount of unicellular algae in the pond, feeding the single-cellent algae by rotifers, feeding the rotifers by the Chinese prawn in the pond and the trachinotus ovatus fry in the net cage, forming a small ecological balance system in the whole pond, observing the rotifer density in the net cage every day, and timely feeding and supplementing when insufficient.
(7) Replacing the seedling net cage: gradually replacing mesh net cages according to the body length of the trachinotus ovatus fry.
The specific implementation is that after 5 days from the beginning of seedling culture, trachinotus ovatus fries grow up obviously, the body length is about 3mm, the mesh of the original netting is small, the mesh is easy to be blocked by impurities in a pond to influence the flow of water inside and outside the net cage and the entrance of rotifers, the netting with larger mesh needs to be replaced at the moment, the netting with the mesh of 60 meshes is replaced to form a first net cage, as the trachinotus ovatus fries grow up, ingestion objects are gradually transformed into bigger copepods from the rotifers, the pond needs to be inoculated with copepods, and the copepods mainly ingest the rotifers in the pond, so that the replacement of the netting with the bigger mesh is also beneficial to the copetrachinotus ovatus fries to enter the net cage for ingestion.
And after 13 days, changing the mesh of the netting into 20 meshes to form a second net cage, wherein the trachinotus ovatus fries are developed to the juvenile stage, the food intake is greatly increased, the bait organism copepods cannot meet the food intake requirement, and the eel meal and the frozen copepods or fairy shrimp and fresh water are beaten into cakes and then float on the water surface for the fries to bite.
After 20 days, most of trachinotus ovatus fries are transformed into juvenile fishes full of scales, so that seedlings can emerge, and the trachinotus ovatus fries can be continuously raised, but the mesh net needs to be replaced to 5 meshes to form a third net cage.
(8) And (6) harvesting the seedlings.
The specific implementation is that after the fry is completely transformed into young fish about 25 days after cultivation, the net is pulled up to collect and transport the fry, and the fry can be transferred to other ponds for cultivation.
Example 3
The embodiment provides a cultivation method of trachinotus ovatus fries, which comprises the following steps:
(1) cleaning and disinfecting the pond.
The method is realized in the concrete way that a pond is cleaned up, the pond is exposed to the sun for 3 days, water is fed for 30cm, quicklime is splashed to the whole pond, the consumption of the quicklime is 50 kg/mu, and a waterwheel type aerator is started to stir the pond water so as to uniformly disinfect the pond.
(2) And feeding water to culture algae.
The specific implementation is that after 5 days, the seawater which is subjected to sand filtration is continuously added to the depth of 2.2m, the 10-11 am on a sunny day is selected to inoculate unicellular algae, algae auxin is splashed, and a waterwheel type aerator is started to stir the pool water to promote the growth of the algae.
(3) Inoculating rotifer and prawn seedling.
The method is specifically realized in the way that when the pond water color is gradually thickened, namely translucent algae color, rotifer is inoculated, meanwhile, monadian auxin is sprinkled every morning and an aerator is started to stir the pond water, and after 3 days, the penaeus vannamei boone is released and cultured, wherein the length of the penaeus vannamei boone is 1cm, and the release density is 40000 tails/mu.
(4) Hatching fertilized eggs: placing fertilized eggs of trachinotus ovatus in a hatching barrel for hatching.
The method is realized in a way that a hatching barrel is arranged at the side of the pond, the capacity of the hatching barrel is 800L, sand-filtered seawater is added into the barrel, fertilized eggs of trachinotus ovatus are placed in the hatching barrel for hatching, the hatching density of the fertilized eggs is 20 g/barrel, and an air discharging head is arranged in the barrel to blow air and oxygenate.
(5) Erecting a fry culturing net cage, wherein the primarily hatched trachinotus ovatus fry cannot pass through the fry culturing net cage, and algae and rotifer in the pond can pass in and out the fry culturing net cage.
The method is realized in a way that cage frames are erected in a pond by using buoys, the specification of the frame is length multiplied by width = 3m multiplied by 6m, a plurality of cage frames of the specification can be erected in one pond, netting of the corresponding specification is hung on the frame, the length multiplied by width multiplied by height = 3m multiplied by 6m multiplied by 2m of the netting, and the mesh is 80 meshes, so that the carangid fry which are hatched for the first time can not pass through the netting and swim to the pond, and algae and rotifers in the pond can freely enter and exit the seedling raising cage. And connecting the bottom of the hatching barrel with a hose, opening a bottom gate, and discharging the hatched trachinotus ovatus into a fry culturing net cage in the pond.
(6) Net cage seedling culture: the larvae of the primarily hatched pompano ingests rotifers in the fry culture net cages, the shrimp larvae of the prawns in the pond ingest the rotifers, the rotifers ingest algae, and the whole pond forms a small ecological balance system.
The specific implementation is that applying algae auxin, sunlight irradiation and aerator agitation to the pond to propagate a large amount of unicellular algae in the pond, feeding the single-cellent algae by rotifers, feeding the rotifers in the pond and the trachinotus ovatus in the net cage to rotifers, forming a small ecological balance system in the whole pond, observing the rotifer density in the net cage every day, and feeding and supplementing in time when insufficient rotifer density is found.
(7) Replacing the seedling net cage: gradually replacing mesh net cages according to the body length of the trachinotus ovatus fry.
The specific implementation is that after 7 days after the beginning of seedling culture, trachinotus ovatus fries grow up obviously, the body length is about 5mm, the mesh of the original netting is small, the mesh is easy to be blocked by impurities in the pond to influence the flow of water inside and outside the net cage and the entrance of rotifers, the netting with larger mesh needs to be replaced at the moment, the netting with the mesh of 40 meshes is replaced to form a first net cage, as the trachinotus ovatus fries grow up, ingestion objects are gradually transformed into bigger copepods from the rotifers, the pond needs to be inoculated with copepods, and the copepods mainly ingest the rotifers in the pond, so that the replacement of the netting with the bigger mesh is also beneficial to the copepodites entering the net cage for feeding the trachinotus ovatus fries.
After 14 days, the mesh of the netting is changed into 15 meshes to form a second net cage, at the moment, the trachinotus ovatus fry is developed to a juvenile stage, the food intake is greatly increased, the bait organism copepods cannot meet the food intake requirement, and the eel meal and the frozen copepods or fairy shrimp and fresh water are beaten into cakes and then float on the water surface for the fries to bite.
After 20 days, most of trachinotus ovatus fries are transformed into juvenile fishes full of scales, so that seedlings can emerge, and the trachinotus ovatus fries can be continuously raised, but the mesh net needs to be replaced by 6 meshes to form a third net cage.
(8) And (6) harvesting the seedlings.
The specific implementation is that after the fry is completely transformed into young fish about 25 days after cultivation, the net is pulled up to collect and transport the fry, and the fry can be transferred to other ponds for cultivation.
The above-mentioned embodiments only express the embodiments of the present invention, and the description is more specific and detailed, but not understood as the limitation of the patent scope of the present invention, but all the technical solutions obtained by using the equivalent substitution or the equivalent transformation should fall within the protection scope of the present invention.
Claims (10)
1. A cultivation method of trachinotus ovatus fries is characterized by comprising the following steps:
(1) cleaning and disinfecting a pond;
(2) feeding water to culture algae;
(3) inoculating rotifer and prawn seedling;
(4) hatching fertilized eggs: placing fertilized eggs of trachinotus ovatus in a hatching barrel for hatching;
(5) erecting a fry culturing net cage, wherein the primarily hatched trachinotus ovatus fry cannot pass through the fry culturing net cage, and algae and rotifer in the pond can pass in and out the fry culturing net cage;
(6) net cage seedling culture: the newly hatched pompano fry ingests rotifers in the fry raising net cage, prawn fries in the pond ingest rotifers, the rotifers ingest algae, and the whole pond forms a small ecological balance system;
(7) replacing the seedling net cage: gradually replacing the net cages of the large meshes according to the body length of the trachinotus ovatus larvae;
(8) and (6) harvesting the seedlings.
2. The cultivation method of trachinotus ovatus fries according to claim 1, wherein the step (1) is specifically as follows: cleaning the pond, exposing the pond for 2-3 days in the sun, enabling the water inlet depth to be about 20-50 cm, sprinkling quicklime into the whole pond, enabling the usage amount of the quicklime to be 50-100 kg/mu, starting a waterwheel type aerator to stir the pond water, and enabling the disinfection to be uniform.
3. The method for cultivating trachinotus ovatus fries according to claim 1, wherein the step (2) is that after 3-5 days, the sand-filtered seawater is continuously added until the water depth reaches 2-2.5 m, the 10-11 am on a sunny day is selected for inoculating unicellular algae, algae auxin is splashed, and a waterwheel type aerator is started to stir the pond water to promote the growth of the algae.
4. The cultivation method of trachinotus ovatus fries according to claim 3, wherein the step (3) is specifically as follows: when the water color of the pond is semitransparent algae color, inoculating rotifer, simultaneously sprinkling unicellular algae auxin every morning and starting an aerator to stir the pond water, and breeding prawn and shrimp fries after 3-5 days.
5. The cultivation method of trachinotus ovatus fries according to claim 1, wherein the step (4) is specifically as follows: putting an incubation barrel at the side of the pond, adding sand-filtered seawater into the incubation barrel, putting fertilized eggs of trachinotus ovatus in the incubation barrel for incubation, wherein the incubation density of the fertilized eggs is 20-30 g/barrel, and inflating and oxygenating an air head in the barrel.
6. The cultivation method of trachinotus ovatus fries as claimed in any one of claims 1 to 5, wherein the step (5) is specifically as follows: and erecting a fry raising net cage with a mesh of 80-100 meshes by using a buoy in the pond, connecting the bottom of the hatching barrel by using a hose, and discharging the hatched trachinotus ovatus fry into the fry raising net cage in the pond.
7. The cultivation method of trachinotus ovatus fries according to claim 6, wherein the step of erecting the fry culture cage is that at least one cage frame is erected in a pond by using a buoy, and a netting is hung on the cage frame, wherein the mesh is 80-100 meshes.
8. The cultivation method of trachinotus ovatus fries according to claim 7, wherein the step (6) is specifically as follows: applying algae auxin, sunlight irradiation and aerator agitation to the pond to enable the monadian in the pond to propagate in a large quantity, feeding the monadian by rotifer, feeding rotifer by prawn larvae in the pond and feeding rotifer by primarily hatched pompano larvae in the seedling net cages, and forming a small ecological balance system in the whole pond.
9. The cultivation method of trachinotus ovatus fries according to claim 8, wherein the step (7) is specifically as follows: after 5-7 days, the length of the pompano fry is 3-5 mm, and a first net cage with 40-60 meshes is replaced; inoculating copepods in the pond, feeding rotifers in the pond by the copepods, and feeding the copepods into the first net cage for feeding trachinotus ovatus fry; after 12-14 days, the development of the trachinotus ovatus fry is in a juvenile stage, replacing a second net cage with 15-25 meshes, and making the trachinotus ovatus meal together with frozen copepods or fairy shrimp and fresh water into cakes which float on the water surface for fry gnawing; most of pompano fry are transformed into juvenile fish after 20 days, and a third net cage with 4-6 meshes is replaced.
10. The cultivating method of trachinotus ovatus fry according to claim 9, wherein the first, second and third net cages are net cage frames with netting of different meshes.
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