CN110973026A - Method for breeding crayfish seedlings in advance - Google Patents
Method for breeding crayfish seedlings in advance Download PDFInfo
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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
- A01K61/50—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
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- Farming Of Fish And Shellfish (AREA)
Abstract
The invention discloses an early breeding method of crayfish seedlings, which comprises the following steps: pond arrangement, pond disinfection, water and grass transplanting and fertilization, wherein parent shrimps are thrown in 8 middle ten days to the beginning of 9 months at a throwing density of 100 kg-150 kg/667m2The ratio of male to female is 2-3: 1; after the parent shrimps are put into the pond, carrying out reinforced cultivation for 20-30 days: the method comprises the following steps of (1) performing rotary feeding on compound feed with 36% of crude protein, soybeans and iced fresh fish, periodically checking gonad development conditions during cultivation, and performing water temperature control, water level adjustment, water oxygenation and water quality management; in the last ten days of 11 months, after the shrimp fries appear, catching the bred parent shrimps and the shrimp fries respectively, and feeding the shrimp fries with juvenile shrimp compound feed with 40% of crude protein for intensive cultivation for 10-15 days. The method can breed the shrimp seedlings in about 2 months, the first shrimp seedlings in the last ten days of 11 months can grow commercial shrimps, the time of coming into the market is at least 60 days earlier than that of breeding commercial shrimps in a conventional external pond, and the effect is extremely obvious.
Description
Technical Field
The invention belongs to the field of aquaculture, and relates to an early breeding method for crayfish seedlings.
Background
Procambarus clarkii (Procambarus clarkii), commonly known as freshwater crayfish, has become the most rapid and potential variety for the development of aquaculture industry in China, especially plays an important role in a paddy field culture mode in recent years, and the newly increased culture area of rice shrimps aggravates the tension situation of crayfish seedlings. At present, although the total output of crayfish is increasing every year, the crayfish consumption market is fierced, and the demand and price of commercial crayfish rise all the way. At present, the offspring seed market mainly comprises naturally propagated spring offspring seeds, the crayfishes begin to mate in the cave after entering autumn every year, the spawning period in the cave in winter is more than 40 days, and during the period, the crayfishes are produced and sold into slack seasons including Hainan period, and only sporadic crayfishes are supplied to the market. From 2 months to 4 months per year, the crayfishes in the traditional culture pond are not yet on the market, so that the crayfishes in the period have less sources and large demand, and the average price of the crayfishes is promoted to be the highest all the year round. The only way to solve the problem of the bland winter is to promote the crayfish fries to breed in advance, transfer the crayfish fries into a greenhouse for breeding and cultivation, and appear on the market early after the crayfish fries are bred.
Disclosure of Invention
The invention aims to provide a method for breeding crayfish seedlings in advance.
The purpose of the invention is realized by the following technical scheme:
a crayfish seedling early breeding method comprises the following steps:
step (1), pond arrangement: the area of the breeding pond is 3-5 mu, the width of the pond ridge is 2-3 m, the slope ratio of the pond ridge is 1 (2-2.5), the depth of the pond is 1.5-1.8 m, and the bottom of the pond is flat; the breeding pond is provided with a multi-span greenhouse consisting of single greenhouses, two layers of plastic films are laid on the top of the multi-span greenhouse to ensure the heat preservation effect, and small doors are reserved at two ends of the multi-span greenhouse respectively to facilitate the entry and exit of managers;
step (2), pond disinfection: 10-15 days before the water plants are transplanted, keeping the water depth of the breeding pool to be 30-40 cm, and adding quicklime into the water to be splashed into the whole pool for disinfection; fishing out all the killed aquatic organisms outside the shed;
step (3), transplanting and fertilizing the aquatic weeds: transplanting waterweed in the middle of the breeding pond and on the slope of the pond ridge, and planting water peanut (alligator alternanthera) on the water surface; after the water plants are transplanted, the breeding pool applies naturally fermented organic fertilizer or fertilizer water paste with faster fertilizer efficiency; after the lilac is rooted and grows, gradually adding new water, and improving the water level of the breeding pond;
step (4), putting parent shrimps: putting parent shrimps in 8 middle ten days to the beginning of 9 months with the putting density of 100 kg-150 kg/667m2The male-female ratio is (2-3) to 1, and the average specification of the parent shrimps is more than 30 g/tail; soaking and disinfecting parent shrimps before entering the pond; when the shrimp is put into the pond, the parent shrimps are uniformly put on the bank side of the pond ridge and are allowed to climb into the water by themselves.
Step (5), parent shrimp cultivation: after the parent shrimps are put into the pond, the intensive cultivation is carried out for 20 to 30 days, and the main method for the intensive cultivation comprises the following steps: the method comprises the following steps of (1) performing rotary feeding on compound feed with 36% of crude protein, soybeans and fresh ice fish, namely feeding 3 days of compound feed, 1 day of soybeans and 1 day of fresh ice fish, wherein each 5 days is a period, the daily feeding amount is 10% of the initial feeding weight of parent shrimps, and the gonad development of the parent shrimps is improved through intensive cultivation; regularly checking the gonad development condition during parent shrimp cultivation, and enhancing schedule management, wherein the daily management comprises water temperature control, water level adjustment, water oxygenation and water quality management;
the water temperature control is a key link for the successful early breeding of the crayfishes, and the water temperature of a breeding pond in the greenhouse is kept between 22 and 28 ℃;
water level adjustment: before the intensive cultivation of the parent shrimps is finished, the water level of the breeding pond is kept between 1 and 1.2 meters, and after the intensive cultivation is finished, the water level is reduced but is not lower than 40cm, preferably between 0.6 and 0.8 meter, so that the crayfishes can conveniently dig holes and mate to lay eggs;
oxygenation of a water body: because the temperature of the air in the greenhouse is high and the air flow is less, micropore oxygenation equipment is required to be used regularly to keep the dissolved oxygen concentration of the water body above 4 mg/L;
water quality management: before the parent shrimps are put in, the transparency of the water body is kept about 40cm, and EM bacteria are used for sprinkling for 1 time every 15 days; before and after the parent shrimps are put in, the transparency of a water body is kept at about 30cm, 1 time of water fertilizing paste is applied every 7-10 days according to the water color condition, and 1 time of EM bacteria is sprayed every 20 days;
step (6), catching the parent shrimps and the shrimp seedlings: in the last ten days of 11 months, when shrimp larvae appear, in order to avoid killing between parent shrimps and young shrimps, feeding large-particle parent shrimp feed and small-particle young shrimp feed simultaneously, wherein the feeding is carried out for 1 time from 3 o 'clock to 4 o' clock every day, the feeding amount of the large-particle parent shrimp feed is 0.5-1 kg/mu, the feeding amount of the small-particle young shrimp feed is 0.25-0.5 kg/mu, the crude protein content of the large-particle parent shrimp feed is 36%, and the crude protein content of the small-particle young shrimp feed is about 40%; catching the bred parent shrimps and shrimp seedlings in time respectively, collecting the caught shrimp seedlings in a net cage, arranging a micropore oxygenation plate in the net cage, continuously increasing oxygen, and feeding juvenile shrimp compound feed with 40% of crude protein for intensive cultivation for about 10-15 days; the shrimp fries after intensive culture are treated according to the ratio of 5000 fries/667 m2The shrimp larvae are put into a breeding pond without parent shrimps or a winter adult shrimp breeding greenhouse for breeding, the survival water temperature difference of the shrimp larvae before and after the feeding is not more than 2 ℃, mixed feed with 36 percent of crude protein content is fed, the daily feeding amount is 8 percent of the initial weight of the fed shrimp larvae, the shrimp larvae are generally continuously bred for about 20 to 35 days, namely commercial shrimps can be caught for sale in about 1 month.
In the step (1), the crayfish breeding pond is rectangular, preferably in the east-west direction, and has a water depth of 0.8-1.2 m. The soil quality of the breeding pond is good due to clay loam, supporting facilities of water, electricity, circuits and the like are perfect, the field meets the requirement of GB/T108407.4, the water source is sufficient, the irrigation and drainage are convenient, and the water quality meets the GB11607-89 fishery water quality standard and the NY5051-2001 pollution-free food fresh water aquaculture water quality requirement.
The single greenhouse is a 8332 type standard greenhouse, and the greenhouse is in the north-south direction.
The width of the greenhouse is 8 m-10 m, the length of the greenhouse is determined according to the shape or area of the pond, and the greenhouse is suitable for the north and south directions. Two sides of the greenhouse are respectively provided with a 30cm flat ridge, and after two ends of the greenhouse are enclosed by plastic films, 1 small door is respectively arranged, so that managers can conveniently get in and out.
A greenhouse is matched with a 0.45kw micropore oxygenation set, and a 4kw water pump is arranged; the feeding boat is equipped to feed and check feeding and growth conditions of crayfishes conveniently.
In the step (2), the dosage of the quicklime is 75kg per mu-1Depth of water 10cm-1。
The organic fertilizer after natural fermentation is generally chicken manure or cattle manure after natural fermentation, and the application amount is 250 kg/mu; the fertilizer water paste is amino acid fertilizer water paste generally, and the application amount is 5 kg/mu.
In the step (3), the waterweeds can adapt to lower water temperature in winter, the waterweeds are transversely transplanted on the bottom and the slope of the pond, the row spacing of the waterweeds is 8m multiplied by 2m, and a small amount of pond sludge is used for compaction during transplantation. If the aquatic weeds are found to be less in the culture process, the supplementary cultivation can be carried out in time.
The water peanuts are fixed by a rectangular frame made of small bamboo poles or PVC pipes, and the planting area of the water peanuts does not exceed 1/2 of the water surface of the breeding pond.
In the step (4), the parent shrimps are strong, have no injury or disease, have complete appendages and are bright in color; when parent shrimps are transported, wind prevention, sun protection and moisture maintenance are achieved, and the transportation time before putting in is not more than 6 hours.
And soaking the parent shrimps in vitamin C or iodine preparation or 3-5% of salt water for 2-5 min. When stocking, the parent shrimps are put in multiple spots and scattered in the big shed, and are evenly put on the float grass at the side of the pond and can not gather to be put in one place.
In the step (5), 2-3 female shrimps are randomly caught every 5-7 days during the parent shrimp cultivation period, the gynopa is stripped off to observe the gonad development condition, and management measures are adjusted in time according to the development condition.
The specific method for controlling the water temperature comprises the following steps: after the parent shrimps are put in the pond for 9 months, the water temperature of the pond is still high, the plastic film does not need to be covered by the greenhouse, and a black sunshade net can be covered and/or underground water can be introduced to reduce the water temperature of the breeding pond; after 9 months, the greenhouse is covered with a plastic film when the water temperature is lower than 25 ℃ along with the gradual decline of the water temperature so as to keep the proper water temperature in the greenhouse.
The specific method for increasing the oxygen of the water body comprises the following steps: and starting the microporous oxygenation equipment continuously every noon (12: 00-14: 00) and night (22: 00-07: 00) during the period from the feeding of the parent shrimps to the emergence of the crayfish in the middle and late 11 months, and keeping the dissolved oxygen concentration of the water body above 4 mg/L.
In the step (6), catching the bred parent shrimps by adopting a large-mesh (4 cm-mesh) ground cage; the shrimp larvae are caught by a dense-hole ground cage (0.5 cm-0.8 cm), and can be placed in the cage for 2-3 times a day.
The crayfish is procambarus clarkii.
The invention has the beneficial effects that:
the method promotes the crayfish fries to be bred in advance through parent intensive cultivation, water temperature control, water oxygenation and water quality control, the crayfish fries can be bred in about 2 months, the first crayfish fries in the first ten days of 11 months are bred into commercial shrimps, the time of the commercial shrimps appearing on the market is at least 60 days earlier than that of the commercial shrimps bred and bred in a conventional external pond, the effect is extremely obvious, the large-scale market supply is advanced, the balance of the supply quantity of the crayfish markets in provinces and even nationwide is promoted, the huge oscillation of the price of the crayfish is inhibited, and the revolutionary change is brought to the crayfish breeding and the industry thereof.
Detailed Description
The technical solution of the present invention will be further explained with reference to the specific embodiments.
Example 1
A crayfish seedling early breeding method comprises the following steps:
step (1), pond arrangement: in the middle and lower Yangtze river areas, the breeding pond is rectangular, the east and west directions are vertical, the area is 5 mu, the width of the pond ridge road surface is 2-3 m, the pond depth is 1.8m, the pond ridge slope ratio is 1:2.5, the pond bottom is flat, and the water depth is 0.8-1.2 m; the soil is preferably clay loam, the supporting facilities of water, electricity, circuits and the like are perfect, and the site meets the requirements of GB/T108407.4; sufficient water source, convenient irrigation and drainage, and the water quality meeting the GB11607-89 fishery water quality standard and the NY5051-2001 requirement of water quality for pollution-free food freshwater aquaculture.
The breeding pond is provided with a multi-span greenhouse consisting of '8332' type single standard greenhouses, the single standard greenhouse frame adopts galvanized pipe materials, the middle is high, and the two ends are low, so that an arch is formed; the frame width of the single standard greenhouse is 8-10 m, the length of the single standard greenhouse is determined according to the shape or area of the pond, the north and south directions of the greenhouse are proper, and a 30cm flat ridge is reserved on each of two sides in the multi-span greenhouse; two layers of plastic films are laid on the top of the multi-span greenhouse, and 1 small door is reserved at each end of the multi-span greenhouse after the two ends of the multi-span greenhouse are surrounded by the plastic films, so that managers can conveniently go in and out.
One monomer standard greenhouse is matched with one set of 0.45kw micropore oxygenation facilities, and one 4kw water pump is arranged; the feeding boat is equipped to feed and check feeding and growth conditions of crayfishes conveniently.
Step (2), pond disinfection: controlling the water depth of the breeding pond to be 30-40 cm 7-10 days before the aquatic weeds are transplanted, adding quicklime into the water, sprinkling and disinfecting the water in the whole pond, wherein the dosage of the quicklime is 75kg per mu-1Depth of water 10cm-1(ii) a And fishing out all the killed aquatic organisms outside the shed.
Step (3), transplanting and fertilizing the aquatic weeds: after the breeding pond is disinfected for one week, transplanting the waterweeds at the bottom and the slope of the breeding pond, wherein the row spacing is 8m multiplied by 2m, compacting by using a small amount of pond sludge during transplanting, placing a rectangular frame made of small bamboo rods or PVC pipes on the water surface, and putting the water peanuts into the rectangular frame, wherein the planting area of the water peanuts does not exceed 1/2 of the water surface of the breeding pond; applying amino acid fertilizer water paste (Beijing fishery, Biotech, Limited liability company) in the breeding pond at 5 kg/mu; after the lilac is rooted and grows, new water is gradually added, and the water level of the breeding pond is increased.
Step (4), during transportation of the crayfish parents, wind prevention, sun protection and moisture maintenance are achieved, and the transportation time is not more than 6 h; putting parent shrimps: feeding crayfish parents in the beginning of 9 months and stockingThe density is 100kg/667m2The male-female ratio is 3:1, the average specification requirement of the parent shrimps is more than 30 g/tail, the constitution is strong, no injury or disease exists, the appendages are complete, and the color is bright; before the parent shrimps are put into the pond, 3-5% of salt water is used for washing for 2min for disinfection so as to kill the pathogens of the shrimps; when the shrimp is put into the pond, the parent shrimps are uniformly put on the bank side of the pond ridge, and put in a plurality of places, so that the parent shrimps can not gather in one place to be put in, and then the parent shrimps can climb into the water by themselves.
And (5) after the parent shrimps are put into the pond, carrying out intensive cultivation for about 30 days, and carrying out rotary feeding on the parent shrimps by adopting a mixed feed of crude protein 36, soybeans and iced fresh fish: feeding 3 days of compound feed with 36 percent of crude protein, 1 day of soybeans and 1 day of iced fresh fish in sequence, wherein the feeding amount is 10 percent of the total amount of parent shrimps in a daily period every 5 days;
during parent shrimp cultivation, 2-3 female shrimps are randomly caught every 5-7 days, the broomcorn are stripped, the gonad development condition is observed, and schedule management is enhanced: water temperature control, water level regulation, water oxygenation and water quality management;
controlling water temperature: the water temperature of the breeding pond in the greenhouse is kept above 20 ℃ and is not more than 28 ℃. After the parent shrimps are put in the pond for 9 months, the water temperature of the pond is still high, the plastic film does not need to be covered by the greenhouse, and a black sunshade net can be covered and/or underground water can be introduced to reduce the water temperature of the breeding pond; after 9 months, the greenhouse is covered with a plastic film when the water temperature is lower than 25 ℃ along with the gradual decline of the water temperature so as to keep the proper water temperature in the greenhouse.
Water level adjustment: before the parent shrimps are put into the intensive culture pond, the water level of the breeding pond is kept between 1 and 1.2 meters; after the intensive cultivation is finished, the water level is reduced, and the water level of the breeding pond is kept between 0.6m and 0.8 m;
oxygenation of a water body: periodically using micropore oxygenation equipment, starting micropore oxygenation continuously every noon (12: 00-14: 00) and night (22: 00-07: 00) until the emergence period of the crayfish is 11 months after the parent shrimp is thrown, and keeping the dissolved oxygen concentration of the water body above 4 mg/L;
water quality management: before the parent shrimps are put in, the transparency of a water body is kept at about 40cm, EM (effective microorganisms) is used for splashing for 1 time every 15 days, and the dosage is used according to the instruction; after the parent shrimps are put in, the transparency of the water body is kept at about 30cm, amino acid fertilizer water paste (Beijing fishery, Biotechnology Limited, Inc., according to the instruction) is applied for 1 time every 7-10 days according to the water color condition, and the compound EM bacteria is used for splashing for 1 time every 20 days.
Step (6), catching the parent shrimps and the shrimp seedlings: from the day of putting parent shrimps, breeding for about 2 months to 11 late ten days, feeding large-particle parent shrimp feed and small-particle juvenile shrimp feed simultaneously during the breeding period for avoiding killing between the parent shrimps and juvenile shrimps, wherein the feeding is performed for 1 time about 4 o' clock every afternoon, the feeding amount of the large-particle parent shrimp feed (the content of crude protein is 36%) is 0.5 kg/mu, and the feeding amount of the small-particle juvenile shrimp feed (the content of crude protein is 40%) is 0.25 kg/mu.
And (5) catching the bred parent shrimps in a large-mesh (4 cm-mesh) ground cage in time, and selling the parent shrimps on the market. The shrimp larvae are caught by a dense-eye (0.5 cm-0.8 cm) ground cage, the caught shrimp larvae are collected in a net cage because of large difference of water temperature inside and outside a greenhouse, a micropore oxygenation plate is arranged in the net cage for uninterrupted oxygenation, and young shrimp compound feed with 40% of crude protein is fed for intensive cultivation for about 15 days.
The shrimp fries after intensive culture are treated according to the ratio of 5000 fries/667 m2The breeding pond is released to breed the shrimps until no parent shrimps exist, the temperature difference of water temperature for survival of the shrimps before and after the release is controlled within 2 ℃, mixed feed with 36 percent of crude protein content is fed, the daily feeding amount is 8 percent of the initial weight of the shrimps, and the shrimps are bred for about 30 days, namely the commercial shrimps can be fished for sale in about 1 month. The time of coming into the market for culturing commercial shrimps by the first shrimp seedlings in the last 11 th month is at least 60 days earlier than that for culturing the commercial shrimps by the conventional external pond.
Claims (10)
1. A crayfish seedling early breeding method is characterized by comprising the following steps:
step (1), pond arrangement: the area of the breeding pond is 3-5 mu, the width of the pond ridge is 2-3 m, the slope ratio of the pond ridge is 1 (2-2.5), and the depth of the pond is 1.5-1.8 m; the breeding pond is provided with a multi-span greenhouse consisting of single greenhouses, and two layers of plastic films are laid on the top of the multi-span greenhouse;
step (2), pond disinfection: 10-15 days before the water plants are transplanted, keeping the water depth of the breeding pool to be 30-40 cm, and adding quicklime into the water to be splashed into the whole pool for disinfection; fishing out all the killed aquatic organisms outside the shed;
step (3), transplanting and fertilizing the aquatic weeds: transplanting waterweeds in the middle of the breeding pond and on the slope surface of the pond ridge, and planting water peanuts on the water surface in a matching way; after the aquatic weeds are transplanted, applying naturally fermented organic fertilizer or fertilizer water paste to the breeding pool; after the lilac is rooted and grows, gradually adding new water, and improving the water level of the breeding pond;
step (4), putting parent shrimps: putting parent shrimps in 8 middle ten days to the beginning of 9 months with the putting density of 100 kg-150 kg/667m2The male-female ratio is (2-3) to 1, and the average specification of the parent shrimps is more than 30 g/tail; soaking and disinfecting parent shrimps before entering the pond;
step (5), parent shrimp cultivation: after the parent shrimps are put into the pond, carrying out 20-30 days of intensive cultivation: the compound feed with 36 percent of crude protein, soybeans and iced fresh fish are fed in a rotating way, and the daily feeding amount is 10 percent of the initial feeding weight of the parent shrimps; during the cultivation of parent shrimps, the gonad development condition is regularly checked, and schedule management is carried out: water temperature control, water level regulation, water oxygenation and water quality management;
feeding parent shrimp feed and juvenile shrimp feed simultaneously in the middle and last ten days of 11 months for 1 time each day, wherein the feeding amount of the parent shrimp feed is 0.5-1 kg/mu, and the feeding amount of the juvenile shrimp feed is 0.25-0.5 kg/mu; respectively fishing the bred parent shrimps and the hatched shrimp fries, collecting the caught shrimp fries in the net cage, and feeding juvenile shrimps with 40% of crude protein with a compound feed for intensive cultivation for 10-15 days.
2. The method for the early breeding of crayfish offspring seeds as claimed in claim 1, wherein in the step (2), the amount of quicklime is 75 kg-mu-1Depth of water 10cm-1。
3. The method for the early breeding of crayfish seedlings according to claim 1, wherein in the step (2), the naturally fermented organic fertilizer is naturally fermented chicken manure or cattle manure, and the application amount is 250 kg/mu; the fertilizer water paste is amino acid fertilizer water paste, and the application amount is 5 kg/mu.
4. The method for the early breeding of crayfish seedlings according to claim 1, wherein in the step (3), the waterweeds are transversely transplanted on the bottom and the slope, the row spacing of the waterweeds is 8m x 2m, and the smaller amount of pond sludge is used for compaction during the transplantation; the water peanuts are fixed by a rectangular frame made of small bamboo poles or PVC pipes, and the planting area of the water peanuts does not exceed 1/2 of the water surface of the breeding pond.
5. The method for the early breeding of crayfish offspring seeds as claimed in claim 1, wherein in the step (4), the soaking disinfection is: soaking parent shrimps in vitamin C or iodine preparation or 3-5% salt solution for 2-5 min.
6. The method for the early breeding of crayfish seedlings according to claim 1, wherein in the step (5), the rotation feeding mode is as follows: feeding the mixed feed for 3 days, the soybeans for 1 day and the iced fresh fish for 1 day, wherein each 5 days is a period.
7. The method for the early breeding of crayfish fries as claimed in claim 1, wherein in the step (5), the water temperature is controlled: the water temperature of a breeding pond in the greenhouse is kept at 22-28 ℃;
water level adjustment: before the intensive cultivation of the parent shrimps is finished, the water level of the breeding pond is kept between 1 and 1.2 meters, and after the intensive cultivation is finished, the water level is reduced but is not lower than 40 cm;
oxygenation of a water body: keeping the dissolved oxygen concentration of the water body above 4 mg/L;
water quality management: before the parent shrimps are put in, the transparency of the water body is kept at 40cm, and EM bacteria are used for sprinkling for 1 time every 15 days; after the parent shrimps are put in, the transparency of the water body is kept at 30cm, the water fertilizing paste is applied for 1 time every 7-10 days, and EM bacteria are sprayed for 1 time every 20 days.
8. The method for the early breeding of crayfish seedlings according to claim 7, wherein in the step (5), the water level of the breeding pond is kept between 0.6m and 0.8m after the intensive cultivation is finished.
9. The crayfish fry of claim 1The method for breeding seeds in advance is characterized in that in the step (6), the shrimp fries after intensive culture are cultured according to the ratio of 5000 fries/667 m2The feed density of the shrimp seeds is put into a breeding pond without parent shrimps or a winter adult shrimp culture greenhouse for feeding, the survival water temperature difference of the shrimp seeds before and after feeding is not more than 2 ℃, mixed feed with 36 percent of crude protein content is fed, the daily feed amount is 8 percent of the initial weight of the fed shrimp seeds, and the commercial shrimp is cultured for 20 to 35 days.
10. The method for the early breeding of crayfish seedlings according to claim 1, wherein in the step (6), the bred parent crayfish is caught in a large-mesh ground cage; and catching the shrimp seeds by adopting a close-hole ground cage.
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| CN113854212A (en) * | 2021-10-29 | 2021-12-31 | 海南归耘田农业科技有限公司 | Directional cultivation method for crayfish seedlings |
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