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 benefit of crabs, prevent the occurrence of diseases and avoid various unnecessary losses, the author has guided the practice of breeding based on science and technology for many years. Share the main points of fattening management techniques for autumn crabs.
First, do a good job of water quality regulation. When the water temperature of the crab pond gradually decreases and stabilizes below 28°C, the water level is adjusted in time, the water depth is controlled at an average of 1 to 1.2 meters, water quality is adjusted, and the transparency is maintained at 35 to 40 meters. 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 microbial preparations to cultivate water quality. Microbial preparations are generally used once every 10 days and end at the end of October.
The second is scientific feeding. According to the temperature changes and the growth of hairy crabs, animal feeds such as small fish and full-grain pellet feeds can be timely fed to achieve the goal of fattening and gaining weight. Animal feeds should be the mainstay, and crabs should be fattened to increase 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 2 hours after feeding), and the amount fed was 45% of the body weight of hairy crabs from mid-October to mid-November.
The third is 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.
The fourth is to prevent the disease. With prevention as the mainstay, and treatment as the supplement, the combination of internal and external use of the drug is a preventive method. It is recommended that the sterilizing and disinfecting drugs and the ciliary caterpillar drug be used once, and that the garlic should be added to the feed every month. Feed 35 days for healthy growth of hairy crabs.
The fifth is to insist on the tour pond. Fight and destroy biological predators in time to prevent birds from eating freshly shelled soft crabs and to prevent diseases.
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