The method of feeding the deducted crab seedlings is not proper, and the phenomenon of precociousness and semi-precociousness often occurs. Farmers buy back the precocious and semi-precociously reared, and often the crabs die when they grow up, seriously affecting the economic benefits.
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The main reasons for the precocity of deducted crab seedlings are shallow water, high water temperature, small aquaculture area, improper feeding methods, excessive protein feed, and water quality, which contributed to premature and semi-precocious maturation of crabs. How to control the crab precocious and semi-precocious? The following 5 measures are proposed for reference by farmers.
1. Simulating the natural ecological environment Plant some aquatic plants in seedling ponds, such as putting peanuts in water, etc., and the area can be 1/3 of the water body. Aquatic grasses not only can feed crabs, hide and cover, and cool down, but also aquatic grasses can breed many aquatic animals, increase the natural bait of crab seedlings, and water plants can also absorb fertilizer and water to play a role in purifying water quality.
2. Grasp the feeding method. When the big-eyed larvae plunge into the pond, the water should be fat, and the proper quantity of plankton should be cultivated. That is, early and late feeding should be refined, and the medium term should be green. Specifically, the young crabs should be fed with fine fishes and fine grained materials from April to May, and by July, August and September, they should be fed less concentrates. , More feed palatability, such as calabash best, when the weather is hot, crabs like to eat cool food. Therefore, it is necessary to use rough generations to reduce the cost of feeding and to control the early maturity of crab seedlings. After October, the temperature dropped gradually and the crabs stopped shelling again. During this period, the main material must be concentrated to make the seedlings robust winter.
3. Do a good job of injection and drainage to continuously improve water quality, increase water levels, increase dissolved oxygen, and control fertilizers.
4. Adjust the pH value of the pool water The optimal pH value for the growth of crab seedlings is between 7.5 and 8.5. Keep this standard. Two limes are applied every month for disinfection, generally 15 kg per mu, which can regulate water quality and prevent diseases of seedlings.
5. The number of fishery dunk crabs should be moderate. The pond area should not be too large or too small. Usually about 2 mu is appropriate. The crab pond culture mode should be used. The best type is the plate type. The “crab Island†should not be set. The pool slope should not be steep. The slope is better than 1:4 and the water depth is about 1.5 meters. 