Nowadays, China's crab breeding technology continues to mature, yield and quality continue to increase, but there are still many unfavorable factors that restrict its development. Crab precociousness is one of the factors, precocious crabs, specifications are generally about 10-40 grams, do not grow, but also due to the difficulty of oyster shell and a large number of deaths, to the majority of farmers have brought great losses. This article only briefly describes how to determine, prevent and control precocious puberty. First, determine the signs of crab precocious 1. Abdomen-shaped female crab abdomen oval or abdominal umbilical long rounded to the base of the foot, surrounded by a long dense and long hair; male abdomen, long and thick abdominal convex bulges in the abdomen, touched with a significant sense of protruding. 2. Body surface color The surface of the precocious crabs is dark green and normal crabs are pale yellow (male) or blue-green (female). 3. Reproductive system Female ovaries have purple-brown or bean-colored hulls with unclear egg masses; male crabs are porcelain white and are easily broken without bending. 4. Crab chewing cheeks are black, dense and long, showing an "O" distribution; while normal crabs are yellow, and thin and short, showing an inverted "C" shape. Second, how to prevent and control precocious puberty 1. Scientific feeding and feeding should follow the principle of "beginning and intermediate", animal feed should be less, the total amount of which does not exceed 30% of the total amount of feed; 6- In September, as little or as little animal feed as possible is used. At the same time, the feeding of plant foods should also allow the crabs to eat enough food and be hungry so as to control the growth and make them grow slightly slower. In the meantime, a small amount of cottonseed cake can also be fed around the end of July, but it cannot be fed too much, otherwise it will cause poisoning death. 2. Regulate water quality Regular use of photosynthetic bacteria, once every 15-20 days, each time 2-3 kg/mu, in order to reduce organic matter content and improve water quality; use lime every 15-20 days in high temperature season, 20 kg/mu each time . Meter, to maintain the best pH 7.0-7.8. The transparency is controlled between 35-40 cm. Under normal circumstances, try to control the number of water changes, because each time after adding water, the juvenile will have a large number of clam shells, appropriately reduce the number of water changes, can control the number of clam shells, and reduce the chance of precocious puberty. 3. In the high temperature season, the pool water temperature should be reduced as much as possible because the higher the water temperature is, the faster the relative growth rate of the crab species is, and the easier it is to become early mature. In summer, high temperatures can be added to the pool during the day to form a micro-flow to the precipitation temperature. At the same time, some water hyacinths, water peanuts, etc. are planted around the pond and in the shallow water area to shave and absorb heat and keep the water depth at 1.2 meters or more. (Source: Scientific fish farming)
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