Channel-tailed fish pond rearing

Catfish tail, also known as American salmon. Native to North America, it is a valuable freshwater cultured species with high nutritional value and economic value.

I. Selection of ponds Ponds that have been cultured with catfish should be constructed in locations where water is sufficient and water is easily accessible. Experience has shown that the normal growth of the cataracts requires a dissolved oxygen of 3 mg/L or more. If dissolved oxygen exceeds 5 mg/L, it will grow well. When dissolved oxygen falls below 5 mg/L, it will grow slowly and the feed coefficient will be large. Therefore, the inaccessible ponds need to be equipped with aerators, otherwise the fish should not be cultured. Pond soil is better with loam, and the water depth is 1.5~2m.

Second, prepare before restocking
1. Dredging and disinfecting old ponds must first dry the pool water and remove excess silt from the pool floor outside the pond. Mu l00kg quicklime or 30ppm bleaching agent for disinfection. Disinfect the sun bath for two weeks. During the drying season, the drainage gates shall be repaired to facilitate timely changing of water during the breeding period.
2. Feitang uses a 60-mesh sieve to make a conical mesh bag to infiltrate the water, so that the depth of the pool is 60cm, and 100kg of organic fertilizer or 2ppm of fertilizer (urea, etc.) is applied in the mu. Gradually add water to 1.5m. If large-scale fish species of 40g/head or more are to be released, the fish ponds can also be fed directly to the pond after 1.5m, and the pH of the pool water can be adjusted to 6.5 to 8.0 to feed the fish species.

Third, seed stocking in order to shorten the breeding cycle, to achieve early stocking, the morning market, ponds single catfish and fishtail should be suitable for stocking 10-20cm of large-size fish species, generally 1,000 to 1,500 per acre stocking. Fish selection requires uniform specifications, no injuries on the surface, and strong vitality. Fish seedlings were soaked in 5% salt water for 5-10 minutes before disinfection.

Fourth, feed feeding
1. The choice of feed and the amount of feed required for feeding are fresh and palatable. The protein content of feed should be 30%-35% in the early stage of stocking, and the protein content in middle and later stages of breeding can be reduced to 25%-28%. The conditions can be fed small fish, chilled fish, snails or snails, snails and snails must be cooked and chopped. The feeding amount was 3%-4% of fish body weight in the initial stage of stocking, and 2%-3% after a body weight of 500g.
2. Feeding method The channel fork likes low light feeding, so the feeding time should be chosen at dawn and dusk. There are clustering characteristics of the spotted fork and tail. By tame food, feeding can be carried out according to the “four definite” method (ie, timing, fixed-point, qualitative, quantitative) to improve the feed utilization rate.

V. Routine management and disease prevention In order to avoid the formation of “bloom” due to over-fertilization in the later stage of cultivation, each pond should be stocked with 60 turtles and 40 turtles. When the fish has a body weight of 250g, micro-flowing water should pass through the pond from 9:00 pm to 4:00 am the next day. The pond with inconvenient water source should be started with an aerator to ensure the water-soluble oxygen content of the pond. Sprinkling quicklime regularly can not only regulate water quality, but also play a role in disinfection. The forked tail has the characteristics of strong disease resistance, so as long as the water quality is well managed, no disease usually occurs. During the middle and late breeding period, the bait is fed every half a month for 3-5 days. The baits are made with allicin and Vc, which not only enhances the disease resistance of the catfish but also promotes its growth.

6. The market price is the best for harvesting the spotted fork and weighing 450-650g. When a weight of 450g can be gradually listed for sale. In general, it is used to pull nets to catch and catch large and small. Flat bottom ponds generally have a catch rate of over 70% on the first net, and up to 90% on the tallest ones. The feeding should be stopped 10 hours before catching.

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