Measures to strengthen autumn breeding of fish species

The water temperature in autumn is generally between 20 and 30 ℃, which is a good time for fish growth. If the fish species are not quickly bred into fat and strong species in autumn, most fish species will die because of their weak physique in the cold winter, and the average survival rate is often less than 60%. Therefore, strengthening the cultivation of fish species in autumn is a top priority for farmers. The specific measures for cultivation are:

Disinfect the pond and transfer it to the original fish pond in Xintang. After several months of culture in spring and summer, the water quality gradually aged, dissolved oxygen and food organisms decreased, and the pathogenic factors increased greatly, affecting the growth of fish species. Especially for small fish species, their predation ability is weak and their growth is more inhibited. Grass carp grow in this environment and are more likely to get sick. Therefore, those who have the conditions should transfer the fish to the new pond and strengthen the cultivation. In places where the water source is difficult, the water from the original fish pond can be used. After Dora transferred all the fish out of the net several times, he was disinfected with 40 kilograms of quicklime per mu, and the fish fry were released after the water quality was cultivated by conventional methods.

Size classification, reasonable collocation of different specifications of fish species should be released in ponds, different species should be rationally matched. For example, silver carp and bighead carp can be matched with 30% grass carp, while grass carp and crucian carp can be matched with about 30% silver carp and bighead carp. The suitable proportion of silver carp to bighead carp is 5 ∶ 1. For example, if the size of bighead carp species is small, the proportion can be lower. If it is a pond specially cultivated for three kinds of fish, the density should not be too high, and the total weight of fish species should be controlled at 100kg to 150kg per mu.

Strengthen feeding and fertilization for fish ponds dominated by silver carp and bighead carp, fertilization should be given priority to, supplemented by concentrate feed. Generally, chemical fertilizer 5kg / mu (the proportion of nitrogen, phosphorus and potassium should be 1 ∶ 1 ∶ 0.5 per mu) or human and animal manure 50 kg / mu per week should be applied, and dissolved water should be sprinkled evenly to cultivate bait organisms in the water. For fish ponds dominated by grass carp, it is necessary to strengthen the feeding of about 5 kg of concentrate per 10,000 fish species per day, together with some duckweed and fresh grass, bait once in the morning and afternoon, and at the same time regularly inject fresh water to keep the water quality fresh. promote the growth and fattening of fish species in order to survive the winter safely.