Long-term production practices have proven that large-sized fingerlings have strong disease resistance and high survival rates. Under the same culture and management conditions, if stocking large-scale fish species, fish production can be greatly improved. Therefore, the stocking of large-size fish species is an important technical measure for obtaining high yield in ponds. In actual production, the specific stocking specifications should be flexibly controlled according to the growth laws of different fish species and the supporting conditions of the fish species, and they should not be stereotyped. 1. herring. It is best to stock two winter fishes with an average tail weight of 0.5 to 1 kg. The fish species of this specification can eat large amounts of snails and grow fast. At the end of the year, the average tail weight can reach 2 to 3.5 kg. If the size of the stocked fish is larger, the multiple of its weight gain will be reduced. In addition, it is difficult to cultivate such a large-sized fingerling. Fish species with a tail weight of less than 0.25 kg have difficulty in ingesting snails with hard shells, and the mortality of fish species is also high. 2. Salmon and squid. It is best to stock a winter-aged fish with a body length of 0.09 to 0.12 meters. The fish species of this specification has a faster growth rate. At the end of the year, the average tail weight of the carp can reach 0.8 to 1.5 kg, and the average tail of the carp can reach 0.4 to 0.6 kg. Under normal circumstances, the larger the size of the stocked carp and carp fish, the faster the growth. Under rare conditions, the end of the year when the carp species were put into the end of the year could grow to an average of 1 kilogram each. 3. Bream. Stocking species with a length of 0.09-0.12 m or more can be grown to a length of 0.4-0.5 kg per end at the end of the year, and a winter-aged species with a stocking length of 0.1-0.15 m can be released at the end of the year. The average length of each tail can be 0.5 to 1 kg. 4. Tilapia. The fish species reared in the year of breeding and having a body length specification of 0.03 meters or more will have an average tail weight of 0.4-0.5 kg after 6 months of cultivation. In short, in the culture mode of adult fish, the consistency of the fish stocking specifications cannot be ignored because of over-emphasis on large-scale stocking.
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