Industrialized method for breeding large-size fish fries of perches

Abstract

The invention discloses an industrialized method for breeding large-size fish fries of perches. The industrialized method comprises the following steps: 1, breeding small fish fries outside cages; 2,carrying out early-stage breeding; 3, carrying out post-period breeding; when body lengths of perch fries reach 2cm, starting to train feeding; firstly, stopping feeding for 24h; then gradually replacing artemia nauplii with 0# perch compound feed with the protein content higher than 45 percent according to the ratios of 20 percent, 50 percent, 80 percent and 100 percent; finishing feeding training within 2 to 3 days according to a principle that a replacement speed is slow firstly and then fast, and then slow; 4, intensively breeding. The breeding method for the perch fish fries, disclosed bythe invention, can be used for intensively training the feeding to finish bait conversion, and a condition that the perches kill each other is reduced; the size of the bred fish fries is uniform andthe survival rate of the perch fish fries can reach 60 percent or more; the survival rate of the fish fries is improved to the greatest extent and the disadvantages in an existing perch fish fry breeding technology are made up; the method has very great actual application value.

Description

technical field [0001] The invention belongs to the field of freshwater aquaculture, in particular to a method for cultivating large-scale seedlings of California perch in industrialized aquaculture. Background technique [0002] California perch has been regarded as an excellent species for freshwater aquaculture because of its fast growth, less disease, good meat quality, and high economic benefits. In recent years, the supply of large-scale California perch fry has been in short supply, especially the demand for fry with a body length of 4 cm or more is more urgent. California perch is a carnivorous fish. Due to uneven feeding and large differences in fish species size in seed cultivation, there is a problem of cannibalism, which greatly reduces the survival rate of seedlings. At present, there is a lack of a large-scale seed breeding method that can effectively reduce mutual cannibalism, convert its feeding habits from animal bait to compound feed, and maintain a high s...

AI Technical Summary

Problems solved by technology

[0003] Chinese patent (CN1653891) discloses a method for cultivating barramundi, through the desalination of larvae breeding ponds and domestication in outdoor ponds, to cultivate barramundi seedlings. However, referring to this method to cultivate California perch, there are obvious individual differences in seedlings and outdoor ponds. It is difficult to focus on training, killing each other is still serious and other problems, resulting in a low survival rate of seedlings, only 20%-30%