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"Closed-knit" From the third stage of juvenile crabs, increase the breeding density, the stocking density is 2 times that of conventional cultivation, and 15,000 pieces of rice are released per mu.
"Cooling down" adopts artificial measures to reduce the temperature of pool water. (1) Enter the high temperature season and raise the water level in the cultivation pool to maintain a water depth of 1.5 to 2.0 meters. (2) Planting shade of aquatic plants. The surface of the water is surrounded by a pond and raised or planted with aquatic plants, with a width of 1 to 2 meters. Under the water, it is planted with seagrass (Oryza nobilis) or Ceratophyllum albus, Hydrilla verticillata, Elodea. (3) Add water to cool down. Whenever the temperature of the water rises, the low temperature outside river water is injected into the crab pool to adjust the temperature of the pool water.
"Limiting baits" limit the amount of food used to prevent excess nutrients in juvenile crabs. (1) The amount of food used is 50% to 70% of the normal amount of crab eaten or fed at regular intervals. When the shelling quantity is required, the quality should be better, so as to avoid food shortage. (2) Feeding is mainly based on plant feeds, and the amount of animal feed should be reduced during the high temperature season. (3) Less use of sterol-containing foods or additives does not artificially promote shelling.
Prevent crab precocious technology
Under the superior conditions of artificial breeding, juvenile crabs tend to appear precocious. If you mistakenly use early-maturing crabs for crab production, from April onwards, premature crabs will continue to die. Even if you don't die, this kind of crab will grow hard and become a "dead crab." Therefore, precautions must be taken to prevent precociousness in larval rearing. In practical production, we have taken some measures and are more effective. The recommendations are as follows: