The use of sea-catching natural egg-breeding crabs in the Zhanqi Town of Yinzhou District of Ningbo utilized the crab seedling nursery facilities to carry out a trial of artificial breeding of Sanguis Portabella, and achieved good economic and social benefits. The seedlings of the three-ported crabs are summarized as follows for reference.
First, pond conditions use crab pond soil nursery ponds, an area of ​​450 square meters / only, water depth 1.2 ~ 1.5 meters, slope ratio 1:3, water temperature 22 ~ 26 °C, pool water salinity 18 ~ 25, pH8 ~ 8.5, ammonia nitrogen Less than 0.4 mg/l, dissolved oxygen not less than 5 mg/l.
II. Disinfection of clear ponds After the nursery of crabs and earthen ponds was completed (in mid-May), a clear pond disinfection was conducted on the nursery ponds. First use the mud pump to clear the bottom of the sludge and residual bait, and then use 3 to 4 kilograms of bleach per pool to dry the bottom of the pond to completely kill the pests. A few days after exposure, ponds were drained and water filtration was started. The depth of the influent water was 60-80 cm, and the whole pool was bleached with a concentration of 60-70 g/m3.
Third, the bait biological culture bait biological cultivation is a very important part, otherwise it will affect the survival rate and yield of seedlings. For this purpose, one week or 10 days before hatching, the 120-mesh Nylon-sieve bag is used to inject fresh water, and 10 to 20 centimeters of fresh water is injected. Then, 4 to 5 kilograms of water for fertilizer or 2 to 3 kilograms of urea are applied for fishing. The plankton is cultured in a/mu to make the water yellowish green or brownish.
Fourth, holding crabs, acquisition, holding
On June 4th, 37 sea-catching crabs were taken from Shenjiamen, Zhoushan. It is required to choose individuals without trauma, appendages, and strong vitality, with a solid abdomen in the abdomen, complete shape of the egg mass, and bright color (usually light yellow). Each body weight should be above 250 grams. When transporting, first hold the claws of the clawed crabs together to prevent them from attacking each other. Then use a foam box nylon bag to transport oxygen. During the journey, you should try to avoid high temperatures or severe vibrations to prevent damage to the crab body. When the eggs and eggs are delivered, they can be put into the cement pool and cultivated immediately after a simple disinfection and fed with bait and other bait. Observe and observe the feeding activities of the crab and the embryonic development of the eggs in daily observation and make records. When microscopically examining the crab's embryo heartbeat at 200 beats/min, it indicates that the larvae are about to emerge. That is to say, draining pool water to catch egg-holding crabs is sterilized and placed in a crab cage (1 per cage), and then directly transferred to a cultivation pond to begin hatching. When the number of hatchery larvae reached the required stocking density, the crab cage was then moved to another culturing tank and continued to hatch.
Fifth, larval rearing and management
1. When the bait variety and feeding are fed from the hospital, the grade of meat is reduced, and the food is sold separately. In the case of gamma-phase III, daily feeding of alga powder 0.2-0.3 kg/cell, soybean milk 1-1.5 kg/cell (based on dry soybeans), egg yolk 10-15 cells/pool, Artemia nauplii 0.5 to 1.5 kg/cell. Stage III to large ocular larvae, in addition to the feeding of the above-mentioned bait, plus the production of shrimp shrimp and frozen Artemia, daily feeding amount of 2 ~ 3 kg / pool. When the clams became juvenile crabs, all of them were changed into shrimp seeds and macro artemia. The daily feeding amount was 6 to 10 kg/cell, and the diet was appropriately increased or decreased depending on the juvenile feeding conditions.
2. The water body exchanges from the virus to the virus phase ~ III period is generally based on the water, the daily water per pool of 5 to 10 cm, after the third phase until the turtle becomes young crabs, began to exchange water for the cultivation pond, the daily exchange of water 20 to 40 cm. In order to make the larvae and bait distributed evenly in the water and prevent oxygen deprivation, an additional aerator of 0.75 to 1 kilowatts is added per pool and the machine is turned on every 3 to 4 hours, each time for 0.5 to 1 hour.
Six, results and experience
1. Test results A total of 3 test ponds were put into nursery this year. Each pool was 450 square meters, totaling 1350 square meters. Thirty-four of the hatching crabs were actually used for hatching, and the survival rate was 91.9%. The entire larvae were raised from the beginning of June 8 to the end of June. Over 20 days, a total of 210,000 juvenile crabs of stage II to III were cultivated, weighing 20.5 kg. The young crabs that were cultivated were sold to farmers on average at prices of 2,000 to 3,000 yuan/kilogram, and achieved good economic and social benefits.
2. Experience a reasonable stocking density is conducive to improving the survival rate and yield of larvae. According to the trials of the crab breeding in the soil of the Dochi crab, it is appropriate to carry out the cultivation of the mud crab pond in the existing facility conditions. Generally, it is appropriate to stock 20,000 to 30,000 larvae per cubic meter of water. In addition, in larval rearing, maintaining a good quality of water to prevent sudden changes in the water environment is conducive to the promotion of larval clams and growth. When the larvae metamorphose to the big eye larvae after 3 to 4 days, in the cultivation pool in time to take additional attachments such as no knot net mesh, etc., can effectively prevent the mutual killing of crab seedlings, help to improve the survival rate. In addition, the use of sea catching natural crabs to carry out soil nursery, the cultivation of crab seed size, strong vitality, high survival rate of aquaculture, welcomed by farmers.
First, pond conditions use crab pond soil nursery ponds, an area of ​​450 square meters / only, water depth 1.2 ~ 1.5 meters, slope ratio 1:3, water temperature 22 ~ 26 °C, pool water salinity 18 ~ 25, pH8 ~ 8.5, ammonia nitrogen Less than 0.4 mg/l, dissolved oxygen not less than 5 mg/l.
II. Disinfection of clear ponds After the nursery of crabs and earthen ponds was completed (in mid-May), a clear pond disinfection was conducted on the nursery ponds. First use the mud pump to clear the bottom of the sludge and residual bait, and then use 3 to 4 kilograms of bleach per pool to dry the bottom of the pond to completely kill the pests. A few days after exposure, ponds were drained and water filtration was started. The depth of the influent water was 60-80 cm, and the whole pool was bleached with a concentration of 60-70 g/m3.
Third, the bait biological culture bait biological cultivation is a very important part, otherwise it will affect the survival rate and yield of seedlings. For this purpose, one week or 10 days before hatching, the 120-mesh Nylon-sieve bag is used to inject fresh water, and 10 to 20 centimeters of fresh water is injected. Then, 4 to 5 kilograms of water for fertilizer or 2 to 3 kilograms of urea are applied for fishing. The plankton is cultured in a/mu to make the water yellowish green or brownish.
Fourth, holding crabs, acquisition, holding
On June 4th, 37 sea-catching crabs were taken from Shenjiamen, Zhoushan. It is required to choose individuals without trauma, appendages, and strong vitality, with a solid abdomen in the abdomen, complete shape of the egg mass, and bright color (usually light yellow). Each body weight should be above 250 grams. When transporting, first hold the claws of the clawed crabs together to prevent them from attacking each other. Then use a foam box nylon bag to transport oxygen. During the journey, you should try to avoid high temperatures or severe vibrations to prevent damage to the crab body. When the eggs and eggs are delivered, they can be put into the cement pool and cultivated immediately after a simple disinfection and fed with bait and other bait. Observe and observe the feeding activities of the crab and the embryonic development of the eggs in daily observation and make records. When microscopically examining the crab's embryo heartbeat at 200 beats/min, it indicates that the larvae are about to emerge. That is to say, draining pool water to catch egg-holding crabs is sterilized and placed in a crab cage (1 per cage), and then directly transferred to a cultivation pond to begin hatching. When the number of hatchery larvae reached the required stocking density, the crab cage was then moved to another culturing tank and continued to hatch.
Fifth, larval rearing and management
1. When the bait variety and feeding are fed from the hospital, the grade of meat is reduced, and the food is sold separately. In the case of gamma-phase III, daily feeding of alga powder 0.2-0.3 kg/cell, soybean milk 1-1.5 kg/cell (based on dry soybeans), egg yolk 10-15 cells/pool, Artemia nauplii 0.5 to 1.5 kg/cell. Stage III to large ocular larvae, in addition to the feeding of the above-mentioned bait, plus the production of shrimp shrimp and frozen Artemia, daily feeding amount of 2 ~ 3 kg / pool. When the clams became juvenile crabs, all of them were changed into shrimp seeds and macro artemia. The daily feeding amount was 6 to 10 kg/cell, and the diet was appropriately increased or decreased depending on the juvenile feeding conditions.
2. The water body exchanges from the virus to the virus phase ~ III period is generally based on the water, the daily water per pool of 5 to 10 cm, after the third phase until the turtle becomes young crabs, began to exchange water for the cultivation pond, the daily exchange of water 20 to 40 cm. In order to make the larvae and bait distributed evenly in the water and prevent oxygen deprivation, an additional aerator of 0.75 to 1 kilowatts is added per pool and the machine is turned on every 3 to 4 hours, each time for 0.5 to 1 hour.
Six, results and experience
1. Test results A total of 3 test ponds were put into nursery this year. Each pool was 450 square meters, totaling 1350 square meters. Thirty-four of the hatching crabs were actually used for hatching, and the survival rate was 91.9%. The entire larvae were raised from the beginning of June 8 to the end of June. Over 20 days, a total of 210,000 juvenile crabs of stage II to III were cultivated, weighing 20.5 kg. The young crabs that were cultivated were sold to farmers on average at prices of 2,000 to 3,000 yuan/kilogram, and achieved good economic and social benefits.
2. Experience a reasonable stocking density is conducive to improving the survival rate and yield of larvae. According to the trials of the crab breeding in the soil of the Dochi crab, it is appropriate to carry out the cultivation of the mud crab pond in the existing facility conditions. Generally, it is appropriate to stock 20,000 to 30,000 larvae per cubic meter of water. In addition, in larval rearing, maintaining a good quality of water to prevent sudden changes in the water environment is conducive to the promotion of larval clams and growth. When the larvae metamorphose to the big eye larvae after 3 to 4 days, in the cultivation pool in time to take additional attachments such as no knot net mesh, etc., can effectively prevent the mutual killing of crab seedlings, help to improve the survival rate. In addition, the use of sea catching natural crabs to carry out soil nursery, the cultivation of crab seed size, strong vitality, high survival rate of aquaculture, welcomed by farmers.
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