1, it is required that the specifications of the fork tail should be uniform and the size should meet the standards of cage culture. When commercial fish were cultured for more than 500 grams in that year, the minimum size of fish species was 30 grams/tail.

2. According to the observation, there are significant differences among different species: 8 ~10cm (5 ~10g/tail) species can reach 200 ~ 300g12 ~15cm (15 ~ 22g by the end of the year. 15 ~ 18cm(22 ~ 40g/ fish) can reach 500 ~ 600 g at the end of August of that year. According to the above three specifications, large-sized fish can be sold in September ~ 65438+February of that year; Medium-sized products can be sold from April to June of the following year; Small products are sold from July to September of the following year. The stocking amount is determined according to the average weight of fish, unit yield and dissolved oxygen satisfaction at expected harvest. The conditions of cage culture vary widely, and the stocking density of fish species ranges from high to low. Generally, the minimum stocking density is 80 fish /m3.

3. The maximum stocking density varies with environmental quality and other factors, and the recommended yield for new farmers is 150kg/m3. It is estimated that the average weight of commercial fish in the future will be 500g and the survival rate will be 95%, so the stocking density will be 3 1.5 fish /m3. In eutrophic water, if feeding management is normal, it is normal to raise 30-50g, 10- 15kg/m3 large fish. After a growth cycle, the yield of adult fish reached 150-200kg/m3. Refer to pond culture for calculation method.

The content of this article comes from: The Journey of Species Protection by China Agricultural Publishing House.