In order to explore a new breeding mode for efficient fisheries, Binhai County of Jiangsu Province conducted a polyculture experiment on white shrimps and river crabs last year and achieved good economic benefits. The experimental farming techniques are introduced as follows:
First, pond conditions and preparation. The pond is made by transforming ditches and dikes around low-yield farmland, covering an area of ​​200 square meters and lifting water to a depth of 1.5 to 1.8 meters. The test site has a quiet environment, convenient water and land transportation, sufficient water supply, clean water, and no pollution. It conforms to the NY5051-2002 standard. The surrounding area of ​​the pond is surrounded by asbestos tiles to prevent escape. One end of the ring ditch is used to block 1000 square meters of plastic pellicles as the second desalination holding pool for white prawns. At the same time, it is equipped with a pump pump, three aerators and a simple particle. Feed machine. At the beginning of May, the pool water was drained to remove the sludge. After the 1125 kg of lime and 675 kg of tea cake were dissolved and soaked, the whole pool was splashed and sprinkled. After filtered water injection, Vallisneria, Elodea, and other water peanuts were planted in the pool. For aquatic plants, 3,750 kilograms of fresh snails are released per 100 square meters.
Second, seed sources and stocking. Penaeus vannamei seedlings purchased from a local nursery base for pollution-free aquatic products, specifications 1.0 cm to 1.2 cm. Crab species specifications are about 10 grams/body, and fish species specifications are 15 centimeters/tail. The stocking rate per 100 square meters of water surface is: 375,000 white penaeid shrimps, 4,500 crabs, and 750 fishes. Shrimp Penaeus vannamei need to be raised temporarily, and the holding pool water is treated with 3 grams of “sea crystal†per cubic meter in advance, so that the salinity of the pool water reaches 2‰ to 3‰, and the returned shrimps adapt to the water temperature in the holding pool. Afterwards, use a formalin solution in a wooden tub for 2 minutes to 3 minutes (20 grams per ton of water). During the holding period, pay attention to adjust the water temperature and water quality, feed the special pellet feed, and remove the enclosure after 15 days of raising. Blocked in feeding ponds.
Third, feed supply and feeding. Adult shrimps and adult crabs are self-contained. The feed formulation is 17% fishmeal (fish dry powder, blood meal), bean cake 40%, bran 30%, bone meal or shell powder 3%, plus 1 ton of special multivitamin and 2% Adhesives. After the shrimp enters Datang, they are fed with feed. According to the weight of shrimps and crabs, they are fed on 3% to 5% of their daily intake. Every day from 7 to 8 in the morning, the total amount of the shrimp is 1/3 of the total daily amount. The rest They are fed from 3:00 to 4:00 in the afternoon and are fed with freshly crushed fresh snails, oysters, and cut pumpkin and potato silk at the later stage to serve as supplements for shrimps and crabs.
Fourth, daily management and harvest. During the entire breeding period, the water quality is always maintained to meet the requirements of fertilizer, living, tender and cool. In the high temperature season, water or water is changed in time so that the transparency of the pool water reaches 30 cm to 35 cm. Adhere to the patrol once a day in the morning and evening, check the water quality, dissolved oxygen, shrimp, crab eating and activities, often clear the enemy, splash lime slurry every 20 days, and use 75 to 150 kg of lime every 100 square meters. To prevent fish and shrimp crab disease and regulate the pH of the pool water. Usually add some chitin, Chinese herbal medicine, etc. to the feed of shrimp and crab to prevent disease and promote clam shell. After 120 days of feeding, white shrimp can grow to 12 cm to 15 cm in diameter, and when the water temperature is 18°C ​​or less, it is drained to dry ponds for shrimps. The crabs were taken in the pool at night and the crabs were caught by hand and caught in cages. The crabs were washed in time and raised for sale.
Fifth, the breeding effect and summary. The total test area is 200 square meters, and 750,000 shrimps of Penaeus vannamei are reared, and 7875 kg of shrimp are harvested. The average size is 56/kg, and the survival rate is 58.8%. 9000 crabs are released and 760 kg of crabs are harvested. The average size is 108. Grams / only, the rate of 78.2% recovery; stocking oysters, squid 1500, harvested 1104 kg of adult fish. The total output value was 236.363 million yuan and the total profit was 110.023 million yuan, with an input-output ratio of 1:1.87. Tests have shown that polyculture of white shrimp and river crab in the same pond is feasible, with a moderate level of yield and high economic efficiency. The gross profit is equivalent to 3667.43 yuan per mu, which is about 40% higher than other local farming models.
First, pond conditions and preparation. The pond is made by transforming ditches and dikes around low-yield farmland, covering an area of ​​200 square meters and lifting water to a depth of 1.5 to 1.8 meters. The test site has a quiet environment, convenient water and land transportation, sufficient water supply, clean water, and no pollution. It conforms to the NY5051-2002 standard. The surrounding area of ​​the pond is surrounded by asbestos tiles to prevent escape. One end of the ring ditch is used to block 1000 square meters of plastic pellicles as the second desalination holding pool for white prawns. At the same time, it is equipped with a pump pump, three aerators and a simple particle. Feed machine. At the beginning of May, the pool water was drained to remove the sludge. After the 1125 kg of lime and 675 kg of tea cake were dissolved and soaked, the whole pool was splashed and sprinkled. After filtered water injection, Vallisneria, Elodea, and other water peanuts were planted in the pool. For aquatic plants, 3,750 kilograms of fresh snails are released per 100 square meters.
Second, seed sources and stocking. Penaeus vannamei seedlings purchased from a local nursery base for pollution-free aquatic products, specifications 1.0 cm to 1.2 cm. Crab species specifications are about 10 grams/body, and fish species specifications are 15 centimeters/tail. The stocking rate per 100 square meters of water surface is: 375,000 white penaeid shrimps, 4,500 crabs, and 750 fishes. Shrimp Penaeus vannamei need to be raised temporarily, and the holding pool water is treated with 3 grams of “sea crystal†per cubic meter in advance, so that the salinity of the pool water reaches 2‰ to 3‰, and the returned shrimps adapt to the water temperature in the holding pool. Afterwards, use a formalin solution in a wooden tub for 2 minutes to 3 minutes (20 grams per ton of water). During the holding period, pay attention to adjust the water temperature and water quality, feed the special pellet feed, and remove the enclosure after 15 days of raising. Blocked in feeding ponds.
Third, feed supply and feeding. Adult shrimps and adult crabs are self-contained. The feed formulation is 17% fishmeal (fish dry powder, blood meal), bean cake 40%, bran 30%, bone meal or shell powder 3%, plus 1 ton of special multivitamin and 2% Adhesives. After the shrimp enters Datang, they are fed with feed. According to the weight of shrimps and crabs, they are fed on 3% to 5% of their daily intake. Every day from 7 to 8 in the morning, the total amount of the shrimp is 1/3 of the total daily amount. The rest They are fed from 3:00 to 4:00 in the afternoon and are fed with freshly crushed fresh snails, oysters, and cut pumpkin and potato silk at the later stage to serve as supplements for shrimps and crabs.
Fourth, daily management and harvest. During the entire breeding period, the water quality is always maintained to meet the requirements of fertilizer, living, tender and cool. In the high temperature season, water or water is changed in time so that the transparency of the pool water reaches 30 cm to 35 cm. Adhere to the patrol once a day in the morning and evening, check the water quality, dissolved oxygen, shrimp, crab eating and activities, often clear the enemy, splash lime slurry every 20 days, and use 75 to 150 kg of lime every 100 square meters. To prevent fish and shrimp crab disease and regulate the pH of the pool water. Usually add some chitin, Chinese herbal medicine, etc. to the feed of shrimp and crab to prevent disease and promote clam shell. After 120 days of feeding, white shrimp can grow to 12 cm to 15 cm in diameter, and when the water temperature is 18°C ​​or less, it is drained to dry ponds for shrimps. The crabs were taken in the pool at night and the crabs were caught by hand and caught in cages. The crabs were washed in time and raised for sale.
Fifth, the breeding effect and summary. The total test area is 200 square meters, and 750,000 shrimps of Penaeus vannamei are reared, and 7875 kg of shrimp are harvested. The average size is 56/kg, and the survival rate is 58.8%. 9000 crabs are released and 760 kg of crabs are harvested. The average size is 108. Grams / only, the rate of 78.2% recovery; stocking oysters, squid 1500, harvested 1104 kg of adult fish. The total output value was 236.363 million yuan and the total profit was 110.023 million yuan, with an input-output ratio of 1:1.87. Tests have shown that polyculture of white shrimp and river crab in the same pond is feasible, with a moderate level of yield and high economic efficiency. The gross profit is equivalent to 3667.43 yuan per mu, which is about 40% higher than other local farming models.
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