Catfish, Intensive Cage Cultivation Technique

The channel forktail, also known as gully plover and American quail, is a large-scale freshwater economic fish. It has wide adaptability, strong disease resistance, rapid growth, and easy feeding. Its meat is delicate and delicious, and it is quite competitive in the market. Now it has become our country. One of the key development targets for famous aquatic products. Using cages for high-density, intensive culture of channel catfish can significantly improve water production efficiency. 1. Site selection: The spot is the fresh water fish, which is suitable for water temperature 0-38°C, and the optimum growth temperature is 21-26°C. It grows well in pure fresh water and can survive in salinity of 1.4 ‰. The catfish cage feeding catfish tail should be carried out in reservoirs, lakes and gentle rivers with good water quality. Where the cages are set up, the water surface should be open, the wind and waves should be small, and the water depth should be more than 8m. 2. There are many ways to arrange and arrange cages for cages. The pontoon bridge type is generally adopted and the cages are distributed on both sides. The operation and management are more convenient. It is made of polyvinyl chloride material into a closed cage or an open cage with a specification of 4m2.5m and a mesh of 2-3cm. When using the new cages, they should be soaked in water for about 1 week; before the old cages are used, they should be cleaned by air for several days to remove attachments and sterilized with drugs. 3. Fish species that are used for cage culture of commercial fish should be fed with fishes over 20cm in length. 150-200 fingerlings per square meter were put in stock, together with stocking about 100 tails of large-sized bream and bream stocks, and more than 10 red bream fish species with smaller specifications were put in order to check the situation of flight prevention. All box species were soaked with 30-50 g/L saline to prevent saprophytic disease. 4. The feed is fed with spotted catfish? The main feed is benthic organisms, aquatic insects, zooplankton, organic detritus and macroalgae. Cage culture catfish tails can be fed with full-priced compound feed, but require protein content of 34% -36%. When fed, the rats were first fed for 1 week, and they were conditioned and fed twice a day. They were fed according to the rhythm of “slow, fast, slow” and “less one more, one less”. The feeding amount should be based on the water temperature, the size of the fish, and the actual feeding conditions. Each feeding should be no longer to catch food by clusters. When the water temperature is 5-12°C, the feeding amount is 1.2%-1.5% of the fish body weight, the water temperature 13-20°C is 2%-2.5% of the fish body weight, the water temperature 21°C-35°C is the weight of the fish 3%-4%. In the cage, there is a food counter, and the operator stands and feeds at a fixed position on the working pontoon. Speckled? Like to feed in the dark light, there is a habit of nocturnal feeding, summer can be hung near the cage - black light traps for food. 5. The routine management of catfish was poor in tolerance to hypoxia, and dissolved oxygen in the water should be kept above 3 mg/L. Water bodies with poor water exchange capacity can regularly move cages. Net cage attachments are cleaned every half month to ensure the smooth exchange of water. Feeding table feeding method is used. When the water temperature is low, the food table is cleaned once in 2-3 days, and cleaned in the hot season to keep the food table clean. Frequently inspect the cages and repair them in time to avoid running fish or wild fish into the tank. When the water level rises and falls, the cage must be adjusted to a suitable depth. In order to control the breeding density and improve the efficiency, the fish body grows up and it is timely to start the arrest and listing in batches. 6, disease prevention and treatment of catfish on the end of the disease more, in addition to regular disinfection, but also insist on not feeding degenerate feed, and regular drug prevention. Gastrointestinal septicemia is a common disease. All kinds of fishes are susceptible to infection. It can be treated by adding oxytetracycline 180g per 100kg for 7-10 days. Squash is also one of the common diseases, which can be treated with 8g/m3 copper sulfate dipping fish for 15-20min.

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