Due to the water system, fish species should be put in reasonably.

In a scientific and technological activity, the author learned that many@#@233@#@households in the pond fish culture process over the years, the yield and benefit are not ideal, the main reason is that the species are not reasonably matched according to the fish feeding habits and habits, the species are single, the quantity is more than small, the specification is small, etc. This kind of situation exists more or less all over the country. At the end of the year and the beginning of the year, it is the season for putting a large number of fish species in various places. In order to make full use of water bodies, reasonably put fish species and improve the yield per unit area of water bodies, the essentials of reasonably putting fish species according to water conditions are briefly described as follows.

1. Fish species released in warm weather. Fish stocking time should be early, general conventional fish water temperature in 5~15℃, tropical fish water temperature in 16℃ above, if the water temperature is low, the temperature does not meet the requirements should not be put, especially ice, freezing, snow, windy, rainy weather can not put fish species.

2. Put in high quality large size fish. The fish species are required to be healthy, individual, injury-free and neat. The feeding specifications are: Pengze crucian carp or other crucian carp 50g/tail, grass carp (old mouth) 400~ 500g/tail and winter slice more than 200g/tail, silver carp (old mouth) 400~ 500g/tail and winter slice more than 200g/tail, freshwater white pomfret 5~ 10g/tail. Fish species should be soaked in 3%~4% saline for 10~20 minutes before entering the pond, and then put in to prevent the introduction of pathogens. Fish transportation should use the water of this pond to prevent fish body discomfort caused by water temperature difference.

3. Rational release of fish species. Large water area, deep water body, rich water quality, sufficient water source, wide source of bait, high scientific management level, adopting rotation catch and release method can stock more fish species; otherwise, appropriate release less. The following provides you with a reference ratio for different water bodies to put fish species, ① reservoir. Water exchange capacity is large, manure or fertilizer should be applied, mainly bighead carp should be stocked, and silver carp, grass, carp, crucian carp, catfish, etc. should be properly matched. The survival rate of large-sized fingerlings is high when 250~ 400g is put in. 13.3 50~100 fish per 667 square meters (1 mu) in large reservoirs above water surface (200 mu), 150~200 fish per 667 square meters in medium reservoirs below 13.3 hectares and above 6.67 hectares (100 mu), and 250~300 fish per 667 square meters in small reservoirs below 6.67 hectares. 300~400 g/fish should be put into mountain pond and Tianhan pond, and about 300 fish should be stocked every 667 square meters to make them reach the commercial fish standard before autumn drought. If there is a village in the reservoir area, the fertile water reservoir with abundant domestic sewage and rich nutrients can put 350~450 fish per 667 square meters; the reservoir with artificial bait can put more fish. 2 pond. The ponds with sufficient water resources and good conditions are rich in natural bait. The artificial feeding intensive culture ponds should be dominated by silver carp, bighead carp and crucian carp. It is appropriate to put 800~1000 fish per 667 square meters, of which silver carp and bighead carp account for 40%, and their proportion is 3∶1 or 4∶1. Crucian carp 50%, grass, bream 10%, the proportion of each half. Tropical fish (400~500 freshwater pomfret or tilapia) are also bred. The pond that depends on rain and ponding can be put less appropriately, and the proportion is the same as that of fish ponds with good water source conditions.

In short, good conditions can be put more, poor put less. The stocking quantity and variety collocation can be adjusted according to the stocking situation over the years.