First, reasonable polyculture. The stocking time of ponds with guaranteed water sources is advanced to February before 1 1-65438+ years, which is beneficial to the transportation of fish species and improves the survival rate. Grass carp can be mainly raised in mountain ponds with shortage of fertilizer source, thin water quality and rich local green feed. Generally, there are 200 grass carp, 80 silver carp and 30-50 bighead carp per mu, with a ratio of 2-3 1-2, and a small number of carp, pomfret and pomfret are raised. For ponds with rich water nutrition and guaranteed feed, fertilizer and funds, the species and density of stocking can be appropriately increased, mainly edible fish, generally 2-3 grass carp 150, tilapia 500, silver carp 1-2 100 and tilapia1. Second, scientific feeding and fertilization. In mountain ponds with water and fertilizer conservation, sufficient base fertilizer should be applied on the 5th day after fish enter tang qian10-/KLOC-0. The base fertilizer can be grass or manure. Topdressing should be flexibly controlled according to the change of water color and water level in the mountain pond, and it is usually topdressing once every 3-5 days. Conditional mountain ponds can plant some oak grass or ryegrass in the open space next to the pond or on the hillside for raising grass carp. When the green feed is insufficient, feed some peanut bran, corn and artificial compound feed to supplement it. Feeding should be timed, qualitative, quantitative and positioned. Third, the prevention and treatment of fish diseases. We should give priority to prevention and combine prevention with treatment. First, do a good job in ecological prevention of mountain ponds, that is, expose, clean and disinfect dry mountain ponds in autumn and winter; 2, putting the good fish into a pond, and soaking the fish in 3-5% salt solution for 5- 10 minute for disinfection before entering the pond; Third, grass carp species should be injected with tissue vaccine; Four, fish disease epidemic season, regular medication to prevent fish disease, feed fish Bikang once every 15 days, feed fish every 100 kg 1 2, and stick the medicine on the grass or mix it with artificial feed. Fourth, round catching and releasing. Mountain ponds that often encounter autumn drought should strive for early stocking. In the mountain ponds that can store water for the winter, the first batch of fish such as grass carp, silver carp, bighead carp and carp will be stocked before1-65438+February, and tilapia and bighead carp will be stocked after 4-5 months. In May and June, if the first batch of stocked fish meets the listing standards, they will be caught and listed in time, and the big fish will be caught and the small fish will be kept, and the corresponding fish will be replenished in time after fishing.