At present, it is the key season for the development of hairy crabs. It is also the final stage of the development of hairy crabs. In order to improve the quality, yield, and benefits of hairy crabs, based on many years of scientific and practical experience, we will analyze the fattening management of crabs in autumn.
1, water quality regulation. Maintain a water depth of 1.2 meters, regulate water quality, and maintain transparency at 3540 cm. Transparency is less than 25cm, change the water 20cm, discharge the old water at the bottom, inject new water, apply microbial agent and sediment modifier after water injection, make the pond water quality fat, live, tender, cool; transparency is greater than 40cm, apply organic bio-organic Fertilizers and microbiological preparations, for cultivating water quality, are generally used once every 10 days until the end of October.
2, scientific feeding. Mainly animal feed, fattening crabs and raising the market size. The amount of animal feeds such as fresh small fish or chilled fish accounts for 60%, and that of boiled corn, soybeans, squash, etc. accounts for 40%. In early October, the amount of feeding was 8% of the body weight of hairy crabs (according to the 2 hours after feeding). In mid-October, the amount of feeding was 45% of the body weight of crabs.
3, aquatic grass care. Keep the water grass coverage rate around 60%. The grass is too dense and the coverage rate is more than 60%. A water channel is used in the dense water plants. The water plants are 5 meters wide and the water channel is 2 meters wide. The grass is too thin, the coverage is less than 30%, and transplanting water peanuts, water spinach, duckweed, etc., makes the hairy crabs have a good growing habitat.
4, disease prevention. In case of prevention, the combination of internal and external use of the prevention method should be used to kill ciliate caterpillars and sterilizing and disinfecting drugs once a month. At the same time, allicin should be added to the feed each month for feeding and feeding, even feed 35 Days, make hairy crabs grow healthily.
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