Oni fish fry production technology

You can choose a cement pond or an earth pond for the breeding pond. The area of ​​the cement pond is about 100 square meters, and the area of ​​the earth pond is 1.0～3.0 acres. The species characteristics and sexual characteristics of the selected broodstock should be obvious, with strong physique, normal color, thick body and high back. Dorsal fin D: XVⅠ-XVⅡ, 12～13 Anal fin A: Ⅲ, 2.Olia tilapia: dorsal fin edge red, throat and chest gray-white, with dark purple-gray vertical bands on the sides9～D: XV-XVⅠ, 11～13 Anal fin A: Ⅲ, Hybrid breeding can be carried out when the water temperature rises above 22℃ every spring. You can also use hot spring water or factory waste water to carry out cross breeding in advance. 2.The water quality of the breeding pool is relatively fat, and the breeding and mouth-hatching activities of broodstock have higher water quality requirements. In order to avoid fish floating heads due to deterioration of water quality, new water should be added frequently, or the aerator should be started to increase oxygen, depending on the water quality and weather conditions.
3 Tin Hou Pond begins to be filled with new water to a water depth of 60 centimeters, and fermented cow manure, pig manure or chicken manure 300~400kg is applied to cultivate the water quality. In this way, after more than 1 months of cultivation, the seedlings can reach 3~5 centimeters, which can be used for adult fish breeding or for raising overwintering seedlings.