CN113133424B - Segmented rapid thickening method for grouper fries - Google Patents
Segmented rapid thickening method for grouper fries Download PDFInfo
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- CN113133424B CN113133424B CN202110599978.4A CN202110599978A CN113133424B CN 113133424 B CN113133424 B CN 113133424B CN 202110599978 A CN202110599978 A CN 202110599978A CN 113133424 B CN113133424 B CN 113133424B
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- 241001596774 Epinephelus akaara Species 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 4
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- 238000012258 culturing Methods 0.000 description 4
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K61/00—Culture of aquatic animals
- A01K61/90—Sorting, grading, counting or marking live aquatic animals, e.g. sex determination
- A01K61/95—Sorting, grading, counting or marking live aquatic animals, e.g. sex determination specially adapted for fish
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; 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
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K61/00—Culture of aquatic animals
- A01K61/80—Feeding devices
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K63/00—Receptacles for live fish, e.g. aquaria; Terraria
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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
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- Environmental Sciences (AREA)
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- Marine Sciences & Fisheries (AREA)
- Animal Husbandry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Farming Of Fish And Shellfish (AREA)
Abstract
The invention discloses a segmented rapid thickening method for grouper fries, which comprises the following steps of: in the first stage, after the fry are primarily screened, fry with different body lengths are put into different net frames; feeding the fries in the net frame with the fairy shrimp and domesticating the fries until the feed of the fries is completely converted into artificial compound feed from the fairy shrimp; and after the fry grow to a preset body length in the second stage, transferring the fry from the net frame to a standard coarse pond for culture, and feeding the fry cultured in the standard coarse pond with artificial compound feed. According to the invention, a sectional type thickening method is adopted, concentrated domestication of the fries is completed in each net frame in the first stage, the domestication time of the artificial compound feed is greatly shortened, then the fries with the body length reaching the preset body length are fed in the thickening pond in the second stage, the culture space is increased, the grouper fries can grow rapidly, the culture time of the fries is further shortened, the whole fry culture time is shorter, and the unit water yield and the survival rate of the fries are higher.
Description
Technical Field
The invention relates to the technical field of grouper fry marking, in particular to a sectional type quick grouper fry marking method.
Background
Groupers belong to the order Perciformes (Perciformes), Percoideis (Percoidei), and the family Serranidae (Serranidae). The grouper meat is tender, has the characteristics of rich nutrition, low fat, high protein and the like, and becomes a pet of consumers and breeders. In recent years, due to the fact that the garrupa is caught abundantly on the bank, the yield is reduced sharply, and the market supply is short, the artificial culture of the garrupa becomes a main source. The grouper becomes an important cultured fish in the south coastal region of China, and the grouper is high in price and has high economic value.
The traditional grouper fry marking method is uniformly carried out in a cement pond, the material domestication difficulty is high, because grouper fries are eaten with live insects before white fries (fries just coming out of a pond or a seedling culture pond, the length of the fries is 1-2cm), the grouper fries need to be trained to eat artificial compound feed in the marking and thickening stage, and the grouper fries are easy to die in the material transferring process. In addition, the growth and development of the grouper are greatly influenced by external environmental factors such as water temperature, pH value, dissolved oxygen, salinity and the like in the juvenile stage, and the immune system of the grouper is not completely developed in the juvenile stage and is easy to be invaded by germs to cause death, so that the traditional marking and thickening method is difficult to control disease prevention and is not beneficial to healthy, stable and continuous growth of grouper seedlings. Moreover, the grouper belongs to carnivorous fishes, is healthy and struggle, and the phenomenon of loss of grouper fries caused by eating small fish in large scale often occurs in the juvenile fish stage.
Due to the reasons, the survival rate of grouper fries, particularly grouper fries with the body length within 10cm, is low, the grouper fries fail to mark coarse or the yield is low, and the development of the grouper industry is seriously restricted.
Disclosure of Invention
The invention aims to provide a grouper fry sectional type rapid thickening method, which solves the problems of large material domestication difficulty, difficult disease control prevention, large water environment influence, large young fish eating and further grouper thickening failure or low yield of the grouper fry in the prior art when the grouper fry thickening method is carried out in the same pond.
The invention is realized by the following technical scheme:
a grouper fry sectional type rapid thickening method comprises the following steps:
the first stage is as follows: after primarily screening the fry, stocking the fry with different body lengths into different net frames; feeding the fries in the net frame with the fairy shrimp and domesticating the fries until the feed of the fries is completely converted into artificial compound feed from the fairy shrimp;
and a second stage: after the fry grows to a preset body length, the fry is transferred to a standard coarse pond from a net frame for cultivation, and the fry cultivated in the standard coarse pond is fed with artificial compound feed.
In the technical scheme, a sectional type thickening method is adopted, fries with approximately same body length are domesticated in all net frames in the first stage in a centralized mode, and the fries grow in a thickening pool in the second stage in an accelerated mode, so that the problems that the grouper fry stage is easy to be attacked by diseases and difficult to domesticate materials are solved, the survival rate of thickening is improved, the thickening time is shortened, and the purpose of efficiently and quickly thickening is achieved.
Specifically, after arranging a coarse marking pond and a screen frame, healthy and active fish fries which just come out of a pond or a seedling culture pond are selected, the fish fries are screened by a fish screen, and the fish fries which can go out of a screen hole belong to small-size fish, while the fish fries which belong to large-size fish in the screen are left. And (3) separately breeding the large and small fishes to the middle of the net frame after primary screening, wherein the large and small fishes are not mixed in one net frame, preferably, the initial placement density is 5000-8000 fishes per net frame, and 5-6 net frames are placed in each coarse marking pond. In some embodiments, the fish sieve used in the fry primary sieve is a No. 1 sieve or a No. 2 sieve with square holes, wherein the square holes of the No. 1 sieve are 0.30 × 0.30cm, and the square holes of the No. 2 sieve are 0.35 × 0.35 cm.
After the large and small fishes are primarily screened and cultured, the first stage of fry feeding and domesticating is carried out. After the fry is placed in the net frames, feeding is started after stress reaction is eliminated, domestication is carried out after feeding, the fry feed is transferred from the feeding of only fairy shrimp to the feeding of only fairy shrimp, and then the artificial mixed feed is mixed and transferred to the feeding of only artificial mixed feed, namely, concentrated domestication of the fry is completed in each net frame in the first stage, and domestication time of the artificial mixed feed is greatly shortened. In addition, relatively independent stable environment in the net frame is more favorable to the disease prevention control of fry and is convenient for the fry to be fished for sieving, and the controllability is stronger, is more favorable to the fast growth of fry, shortens the cultivation time of fry.
After the fry grow in each net frame until the body length reaches the preset body length, the fry are transferred to a standard coarse pond for further culture, and after material domestication, the fry cultured in the standard coarse pond can be fed with artificial mixed feed every day. After the first-stage material-domesticating period, the grouper fries are transferred to a standard coarse pond for second-stage feeding, the culture space is increased, the grouper fries can grow rapidly, and the culture time of the grouper fries is shortened.
Through the sectional type thickening method, the domestication time of the artificially-matched bait can be greatly shortened, the disease prevention and control of the fry are facilitated, the fry is fast in growth speed in the second stage, the fry cultivation time is short, the unit water yield is high, the controllability is strong, and the fry emergence amount is stable.
In some embodiments, the specific steps of setting the coarse calibration pond and the screen frame are to set the coarse calibration pond and then pre-treat the construction and seawater in the coarse calibration pond. Then, a plurality of net frames are hung on the side of the coarse pond for stocking grouper fries with different body length intervals in the first stage. In one or more embodiments, the indoor standard coarse tank is preferably a square tank with four circular arc-shaped corners of 5 meters × 5 meters or a rectangular tank with four circular arc-shaped corners of 4 meters × 6 meters, the circular arc corners facilitate sewage discharge and tank brushing, the size of the tank facilitates operation of workers, the depth of the tank is 1.0-1.2 meters, and the sewage discharge port is arranged in the center of the tank. In one or more embodiments, the pretreatment of facilities and seawater in the pond comprises washing cement coarse pond and air stone, disinfecting with strong chlorine, adding filtered fresh seawater, fixing the depth of the seawater to be 10-15 cm from the sides of the pond, and culturing with convection water.
In some embodiments, the net frame is preferably a circular net frame, the circular arc shape has no edges and corners to reduce damage to fish, the diameter of the net frame is 1.2-1.5 m, the mesh openings of the net frame are smaller than those of seedlings discharged from a pond, the depth of the net frame is 0.5-0.8 m, a floating ring is arranged at the lower part of the outer annular surface of the net frame, so that the net frame can float on the water surface, and the edge of the net frame is 5-8 cm away from the water surface.
In one or more embodiments, the net frame is fixed at the edge of the coarse pond through ropes, so that the net frame is prevented from floating in the pond.
In one or more embodiments, the requirements of the selected fry are: the fry is bright in color, quick in response, free in swimming, uniform and neat in specification and free of deformity.
As a preferred embodiment of the first stage of the invention, in the first stage, fairy shrimp are fed on the 1 st to 2 th days after the fry is placed in the net frame, domestication is started on the 3 rd day, artificial compound feed is mixed in the fairy shrimp for feeding, when feeding is carried out on the 4 th day, the artificial compound feed is fed firstly until the fry does not eat the artificial compound feed and then the fairy shrimp is fed until the fry is fully fed, and then the feeding mode on the 4 th day is repeated until domestication is completed; wherein the feeding times per day in 1-2 days are more than the feeding times per day in the material domesticating period. Through the feeding mode in the technical scheme, the fry domestication can be completed faster and more safely, and the death rate of the fry in the process of transferring the fry is greatly reduced.
In one or more embodiments, feeding may begin on day 1 about 2 hours after the fry is placed in the frame.
In one or more embodiments, the fairy shrimp is a giant shrimp screened by 50-60 mesh nylon yarn.
In one or more embodiments, the artificial mixed feed is floating, and the feeding basket is a square floating frame with the side length of 15-20 cm, which is made of a plastic pipe with the diameter of 4cm, and the floating materials are poured into the square floating frame and cannot float.
Further, as a preferred feeding domestication mode of the invention, the feeding times per day in the 1 st to 2 nd days are 6 times, the feeding mode is that feeding is carried out once at 7 points per day, and then feeding is carried out once every 2 hours; the feeding times per day in the material domesticating period are 4 times, and the feeding mode comprises feeding once 7 o 'clock before, feeding once 11 o' clock, feeding once 14 o 'clock, and feeding once 17-18 o' clock every day.
Further, during feeding and material domestication, dirt suction is carried out after feeding for the first time every day. The excrement discharged by the fry and the feed at the bottom of the fish are sucked out by sewage suction, and the sewage suction is preferably carried out by adopting a siphon method to suck the bottom completely.
Further, in the first stage, when the fry in the same net frame are killed mutually, the fry is screened again, and the fry is put in the net frame with the corresponding body length according to the fry screening result. In the first stage, the growth speed of the fry is different according to individuals, in order to avoid the situation that the fry in the same net frame eat small fishes due to large fishes, the fry is required to be screened for many times in the first stage, the fry is screened by selecting the fish screen with proper sieve pore size according to the size of the fishes, and the fry with the body length in the same interval is put in the same net frame. Among this technical scheme, being provided with of screen frame does benefit to drag for the fry and sieves, and the controllability is stronger.
Furthermore, the stocking density of the fry in the net frame is adjusted according to the size of the fry, after the fry is screened by a fish screen with a screen hole of 0.40 multiplied by 0.40cm, the placing density of the net frame for placing larger fry is 3000-4000 pieces per net frame, and after the fry is screened by a fish screen with a screen hole of 0.55 multiplied by 0.55cm, the placing density of the net frame for placing larger fry is 2000-2500 pieces per net frame.
Further, in the second stage, the stocking density of the fries in the standard coarse pond is adjusted according to the body length of the fries, and the stocking density of the fries with the body length of 4-5 cm is 1200-1500 fries/m 3 The stocking density of the fry with the body length of 6-8 cm is 1100-1300 pieces/m 3 The stocking density of fry with the body length of 8-10 cm is 900-1100 pieces/m 3 And when the body length of the fry reaches the corresponding interval, screening the fry and replacing the pond.
Further, in the second stage, the feeding times of the fries in the rough marking pond are adjusted according to the body lengths of the fries, the fries with the body lengths of 3-5 cm are fed once 7 points before, once at 11 points, once at 14 points and once at 17-18 points every day, and the feeding is carried out for 4 times in total; feeding the fry with the body length of 5-10 cm once at 8 points, once at 13 points and once at 18 points every day for 3 times in total.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. according to the invention, a sectional type thickening method is adopted, concentrated domestication of the fries is completed in each net frame in the first stage, the domestication time of the artificial compound feed is greatly shortened, then the fries with the body length reaching the preset body length are fed in a thickening pond in the second stage, the culture space is increased, the quick growth of the grouper fries is facilitated, the culture time of the fries is further shortened, the culture time of the whole fries is shorter, and the yield of a unit water body and the survival rate of the fries are higher;
2. the relatively independent stable environment in the net frame is more favorable for preventing and controlling diseases of the fry and facilitating the fry to be fished and sieved, the controllability is stronger, the quick growth of the fry is more favorable, and the cultivation time of the fry is shortened;
3. the material domestication method adopted in the invention is beneficial to completing the material domestication of grouper fries more quickly and safely, and greatly reduces the death rate of the fries in the material transferring process;
4. according to the invention, the stocking density of the fry in the net frame and the mark thick pond is adjusted according to the body length of the fry, so that the phenomenon that big fishes eat small fishes can be effectively reduced, the disease transmission probability is reduced, and a healthier cultivation environment is provided for the fry.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a block flow diagram of an embodiment of the present invention;
FIG. 2 is a block diagram of the first stage of fry feeding and domesticating process in an embodiment of the present invention;
fig. 3 is a schematic layout of the coarse marking tank, the net frame and the feeding basket in the embodiment of the invention.
Reference numbers and corresponding part names in the drawings:
1-marking a coarse pond, 2-screen frame, 3-feeding basket and 4-rope.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
The term "connected" used herein may be either directly connected or indirectly connected via other components without being particularly described.
In the description of the present invention, it is to be understood that the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore, should not be taken as limiting the scope of the invention.
Example 1:
referring to fig. 1 to 3, in example 1, the tiger-dragon hybrid spots are used as rough targets, and the specific steps are as follows:
(A) set up interior label coarse pool 1, carry out the preliminary treatment to facility and sea water in the pond:
the indoor pool is a square cement pool with 5 m multiplied by 5 m and four arc corners, the depth of the pool is 1.0 m, and the sewage outlet is arranged in the center of the pool. Arranging 8 air stones around the pool, adding 30cm of seawater, adding strong chlorine essence for disinfection, adding fresh seawater after brushing the pool, and setting the water level at 15cm away from the pool edge by adopting a convection mode.
(B) Setting a first-stage cultivation net frame with a coarse mark:
in the first stage, the cultivation net frame 2 is made of circular net frame plastic with the diameter of 1.5 meters, the meshes are rectangular meshes, the length of the meshes is 1cm, the width of the meshes is 0.2cm, the depth of the net frame is 0.6 meter, a floating ring is arranged on the lower portion of the outer annular surface of the net frame, the net frame can float on the water surface, and the edge of the net frame is 6cm away from the water surface. The net frame 2 is fixed at the side of the pool by ropes 4, so that the net frame is prevented from floating in the pool.
(C) Selecting, primary screening and stocking the fry:
observing the state of the fry in the pond from two days to a fry culture place, observing the state of the fry after the fry is purchased, and selecting the fry which has bright color, quick response, free swimming and uniform and regular specification.
After the fry is transported back, the fry is firstly screened by a No. 1 screen (0.30 multiplied by 0.30cm), large and small fries are placed in different screen frames, small garrupa fries which can go out from screen holes are placed in each screen frame, the small garrupa fries belong to small garrupa, the large garrupa fries which are left in the screen are placed in different screen frames according to the size, and the large and small garrupa fries are not mixed in one screen frame. 8000 fries are placed in each net frame, 5 baskets of fries are placed in each pool, and 3 pools are placed in total.
(D) Feeding, domesticating and dirt absorbing of fry in the first stage:
feeding the fries to fairy shrimp screened out by 50-60 meshes of nylon yarn 2 hours after the fries are placed in a net frame, and feeding the fries once every two hours until the fries are dark; on the next day, the fairy shrimp are fed in the same way, and the fairy shrimp are fed once before 7 o' clock in the morning and then fed once every 2 hours; feeding the fairy shrimp by mixing 10% of artificial compound feed into the fairy shrimp on the third day, wherein the feeding is carried out once before 7 am, once at 11 am, once at 2 pm and once at 5-6 pm; on the fourth day, only artificial mixed feed is firstly added before feeding, the artificial mixed feed is scattered in a square feeding basket 3 with the side length of 15cm, and the fairy shrimp are fed once before 7 am, once at 11 am, once at 2 pm and once at 5-6 pm when the fry is not fed with the feed until the fry is full; so train and all convert into to eat artifical compound feed until the fry, eat only need after the artificial bait completely to throw and feed the float to the float basket and feed. And after the first feeding is finished every day, performing full bottom suction by adopting a siphon method.
(E) Screening and separate culturing of fry in the first stage: when about 3-5% of fishes begin to kill each other, namely big fishes bite small fishes, a No. 3 sieve (0.40 multiplied by 0.40cm) is adopted to screen fish fries, the big fish fries and the small fish fries are separately placed on different net frames, and the fish placement density of the big fishes is 4000 per basket. After feeding for 3 days, the mutual killing starts, and at the moment, the fry is screened by a No. 5 screen (0.55 multiplied by 0.55cm), and the large fry is placed in 2500 strips per basket. And (4) screening and selecting the fry by using No. 6 screen after feeding for 2 days, putting the sorted large fry into a coarse marking pond, and continuously putting the small fry into a net frame for cultivation.
(F) And (3) culturing the fry in the second stage:
the density of the fry placed in a standard coarse pond is 1800 strips/m 3 Feeding artificial mixed bait for 4 times every day in a water body, wherein the feeding time is once before 7 am, once at 11 am, once at 2 pm and once at 5-6 pm; when the fry grows to 4-5 cm, the fry is screened, the big and small fishes are opened, and the stocking density is 1200-1500 strips/m 3 Feeding artificial mixed bait for 4 times every day in a water body, wherein the feeding time is once before 7 am, once at 11 am, once at 2 pm and once at 5-6 pm; when the fry grows to 6-8 cm, the fry is sieved again, the large and small fishes are opened, and the stocking density is 1100-1300 pieces/m 3 Feeding artificial mixed bait for 4 times every day in a water body, wherein the feeding time is once before 7 am, once at 11 am, once at 2 pm and once at 5-6 pm; when the fry grows to 8-10 cm, the fry is screened, the big and small fishes are opened, and the stocking density is 900-1100 strips/m 3 Feeding 3 times of artificial mixed baits every day in the water body, wherein the feeding time is 8 o ' clock in the morning, 1 o ' clock in the afternoon and 6 o ' clock in the afternoon.
After 25 days of cultivation, 10 thousands of 9-10 cm tiger-dragon hybrid spot seedlings are cultivated, and the survival rate reaches 83.33%.
Example 2:
the procedure and parameters of this example are substantially the same as those of example 1, except that the coarse object is Epinephelus akaara. The incubation time for the first stage was 12 days and for the second stage 33 days. 10 ten thousand of epinephelus akaara fries are selected, about 8 thousand of epinephelus akaara fries with 9-10 cm are cultivated through the standard thickening of 45 days, and the survival rate reaches 80.00 percent. The difference of the total cultivation time is that the growth speed of the Epinephelus akaara is slower than that of the hybrid Epinephelus carinatus.
Example 3:
the procedure and parameters of this example are substantially the same as those of example 1, except that the coarse target is Epinephelus coioides, the first stage culture time is 9 days, and the second stage culture time is 20 days. And selecting 15 ten thousand epinephelus coioides seedlings, and culturing 13 ten thousand epinephelus coioides seedlings with the diameter of 9-10 cm by 29 days, wherein the survival rate reaches 86.67%.
According to research, the survival rate of the existing grouper fry thickening method which is not concentrated in a thickening pool in a segmented manner is usually 60-70%, while the survival rate of the segmented thickening method is basically more than 80%. Meanwhile, the cultivation time of the existing grouper fries is usually 30-60 days (different according to different groupers), which is more than 25-45 days of the standard and coarse method provided by the invention. Therefore, the sectional type rough marking method can greatly shorten the cultivation period by utilizing the centralized domestication of the net frame and the accelerated growth of the rough marking pool, the material domestication method can effectively reduce the death rate during the material domestication period, the relatively independent stable environment in the net frame is more favorable for preventing and controlling diseases of the fry and facilitating the fry to be fished and sieved, and the overall survival rate of the rough marking method is improved. In addition, in actual operation, the screen frame adopted in the sectional type thickening method is beneficial to fishing and sieving the fry, the controllability is stronger, the operation is simpler, the thickening can be completed by only 1 to 2 persons, and compared with the thickening method of at least 3 persons in the prior art, the thickening efficiency is effectively improved, the thickening difficulty is reduced, and the method has important application and popularization values.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A grouper fry sectional type rapid thickening method is characterized by comprising the following steps:
the first stage is as follows: after primarily screening the fry, stocking the fry with different body lengths into different net frames, screening the fry when 3-5% of the fries in the net frames are killed mutually, stocking the fry into the net frames with corresponding body lengths according to the fry screening result, and screening the fry for multiple times in a first stage until the fry grows to a preset body length in order to avoid the condition that the fry in the same net frame eat small fishes; feeding the fries in the net frame with the fairy shrimp and domesticating the fries until the feed of the fries is completely converted into artificial compound feed from the fairy shrimp;
and a second stage: after the fry grows to a preset body length, transferring the fry from the net frame to a standard coarse pond for culture, and feeding the fry cultured in the standard coarse pond with artificial compound feed; the stocking density of the fry in the standard coarse pond is adjusted according to the body length of the fry, and the density of the fry in the standard coarse pond is 1800 fries/m 3 The stocking density of the fry with the body length of 4-5 cm is 1200-1500 fries/m 3 The stocking density of the fry with the body length of 6-8 cm is 1100-1300 pieces/m 3 The stocking density of fry with the body length of 8-10 cm is 900-1100 pieces/m 3 And when the body length of the fry reaches the corresponding interval, screening the fry and replacing the pond.
2. The sectional type rapid grouper fry thickening method according to claim 1, wherein in the first stage, the groupers are fed on 1 st to 2 th days after the groupers are placed in the net frame, domestication is started on 3 rd days, the groupers are mixed with artificial formula feed for feeding, when feeding is performed on 4 th day, the artificial formula feed is fed firstly until the groupers do not eat the artificial formula feed, the groupers are fed again until the groupers are fully fed, and then the feeding mode is repeated on 4 th day until domestication is completed; wherein the feeding times per day in 1-2 days are more than the feeding times per day in the material domesticating period.
3. The grouper fry segmented rapid thickening method according to claim 2, wherein the feeding times per day in the 1 st to 2 nd days are 6, the feeding mode is that the grouper fry are fed once at 7 points per day, and then the grouper fry are fed once every 2 hours.
4. The grouper fry segmented rapid thickening method as claimed in claim 2, wherein the feeding times per day during the feeding period are 4 times, and the feeding mode comprises feeding once 7 o 'clock before, feeding once 11 o' clock, feeding once 14 o 'clock and feeding once 17-18 o' clock.
5. The sectional rapid grouper fry thickening method as claimed in any one of claims 1 to 4, wherein during feeding and feeding training period, after the first feeding every day, dirt absorption is performed.
6. The sectional type rapid grouper fry thickening method according to claim 1, wherein the stocking density of fries in the net frame is adjusted according to the size of the fries, after screening by a fish screen with a screen hole of 0.40 x 0.40cm, the stocking density of the net frame for placing larger fries is 3000-4000 strips per net frame, and after screening by a fish screen with a screen hole of 0.55 x 0.55cm, the stocking density of the net frame for placing larger fries is 2000-2500 strips per net frame.
7. The sectional rapid grouper marking method as claimed in claim 1, wherein the screen holes of the fish screen adopted by the fish fry primary screen are square holes, and the size of the square holes is 0.30 x 0.30cm or 0.35 x 0.35 cm.
8. The sectional type rapid grouper fry thickening method according to claim 1, wherein in the second stage, the feeding times of fries in the thickening pond are adjusted according to the body lengths of the fries, and the fries with the body lengths of 3-5 cm are fed once 7 points, once at 11 points, once at 14 points and once at 17-18 points every day for 4 times in total; feeding the fry with the body length of 5-10 cm once at 8 points, once at 13 points and once at 18 points every day for 3 times in total.
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