1. Aquatic planting and snail migration can be referenced to ponds and grasses for routine operation of snails and crabs. Spirogyra rich, can not grow and transplant; snail resources are small, each mu should be transplanted 7-10 kg snail.
2. Artificially cultivated shrimp, which are usually stocked in two ways. The first is that from April to May each year, 15-20 kg per acre, the specifications of which are more than 40 shrimps per kilogram; the second is from August to September each year, put a shrimp or brood with a weight of 25 grams or more per acre. 10-20 kilograms, requiring a male to female ratio of 3:1. Shrimp should be kept in stock for three consecutive years. Afterwards, natural populations can be formed and shrimp species need not be added. Only reasonable fishing and conservation are required. When shrimps are stocked, they are sterilized with 3-4% saline for 8-10 minutes. In order to prevent escape of shrimp and encroachment of predators, isolation nets should be set up at the deep and shallow water boundaries around aquaculture waters.
3, do a good job of fertilizing and feeding food. Artificially cultivated crayfish are generally not fertilized. However, if the stocking density is high or plankton is not abundant in the culture area, it should be artificially applied. It is better to use rotting and non-polluting pigs, cow dung, etc. as far as possible, and to use as little or no fertilizer as possible. The amount of fertilizer applied is usually 100-150 kilograms per acre per acre applied and applied in 2-3 times. Artificially cultivated crayfish generally do not need to feed. Plankton, aquatic grasses and benthic snails in the water can meet their growth needs. If the density of the shrimp is relatively large and the natural food in the aquaculture water area is insufficient, the feed must be manually fed. . Such as livestock and poultry products processing of waste, bran, surimi, rapeseed cake, melon, etc., lobsters like to eat. During the growing season, the bait is usually fed for 15-20 days, and 7-10 kilograms per acre are thrown.
4, scientific fishing. Taking into account the re-use of resources and the high productivity and efficiency of each year, it is extremely important to determine the appropriate fishing specifications and quantities after successful breeding. When fishing, large nets should be used for the purpose. A single shrimp weighing more than 15 grams will be harvested and put on the market, with less than 15 grams left. It will continue to grow in the aquaculture waters.
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