Rapid breeding method for small yellow croakers

Abstract

The invention discloses a rapid breeding method for small yellow croakers. The breeding method comprises the following steps: (1) selecting one-age individual female fish and male fish as parents; (2) carrying out artificial spawning induction on the selected parents by using an oxytocic; (3) 0.5-1 h before spawning of the parent fish, independently pairing the male fish with a large amount of seminal fluid flowing out through artificial gentle extrusion with the female fish with rounded and bulged reproductive holes, collecting fertilized eggs for incubation and cultivation, and constructing different families; the female fish does not need manual egg squeezing; and (4) performing genetic evaluation on different families by using body quality data at the age of 8 months, and breeding parents according to a genetic evaluation result. According to the method, parents are one-age individuals, the breeding age limit is shortened, the number of obtained high-quality fertilized eggs is large, and male and female parent fishes are almost not damaged and can be reused after short-time intensive cultivation. According to the method, the accuracy of genetic evaluation is highest when breeding is limited to be 8 months old, meanwhile, the breeding quantity can be reduced, and the breeding cost can be effectively reduced.

Description

technical field [0001] The invention relates to the field of aquaculture, in particular to a rapid breeding method for small yellow croaker. Background technique [0002] The small yellow croaker (Larimichthys polyactis) has very important economic value. Due to the long-term fishing pressure and changes in the marine environment, the resource structure of the wild population of the small yellow croaker has been severely damaged in recent years, manifesting as individual miniaturization and early sexual maturity. Germplasm decline. The artificial breeding of small yellow croaker was successful in 2015, and then it broke through the large-scale breeding of fry and realized large-scale cage culture, which laid a solid foundation for the industrial development of small yellow croaker. [0003] However, at present, there is a serious shortage of improved varieties with large differences in growth among individuals and excellent growth traits in the breeding process of small yell...

AI Technical Summary

Problems solved by technology

The accuracy of this breeding method is low, and it takes a long time to obtain new varieties with excellent traits

Simultaneously, there are certain disadvantages in the method of artificially induced labor and egg-squeezing insemination provided in this invention, such as the inevitable damage to brood fish in the artificial egg-squeezing and semen collection process, especially the small yellow croaker, which is highly stressful, and artificial operation will bring fatal injury

At the same time, the window period for spawning of small yellow croakers after induced spawning is relatively short, and the spawning quality is the best at night. In order to successfully obtain broodstock that are just mature and ready to spawn, continuous observation is required, which increases the labor force and scares the broodstock. This further affects the quality of the eggs, and the method is a little careless. The broodstock excretes eggs by itself or the eggs are overripe. The above problems lead to a low success rate of family building, and the number of individuals in the family is relatively small

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