Early propagation and rapid breeding method of little yellow croakers

Abstract

The invention relates to the technical field of mariculture fish propagation and breeding, and particularly relates to an early propagation and rapid breeding method of little yellow croakers. The method includes preparation of a parent fish pond and an incubation cylinder, selection of parent fish to nutrient enhancement, ovulation and fertilization, oosperm incubation, breeding cultivation and others. Through the early propagation and rapid breeding method of little yellow croakers, the spawning fertilization time of the little yellow croakers is advanced by 1 month in comparison to nature condition, the rate of inducing spawning is 88.2+ / -0.2%, rate of fertilization is 78.4+ / -0.1%, and the hatching rate is 76.7+ / -0.1%; the fry breeding time of small yellow croaker with body length of 5cm is shortened by 50 days in comparison to that under the nature condition; the average body length of fry at the beginning of June is up to 7.8 cm, the survival rate is improved by 20%; thus the early emergency and advanced marketing of the little yellow croakers are realized; the offspring seeds of the little yellow croakers are high in price and good in economic benefit; meanwhile, the market demand on large-sized little yellow croakers can be released, and a way for protecting the fishing resource of the little yellow croakers in the East China Sea is provided.

Description

technical field [0001] The invention relates to the technical field of seawater cultured fish breeding and breeding, in particular to a method for early breeding and rapid breeding of small yellow croakers. Background technique [0002] Small yellow croaker, large yellow croaker, octopus, and squid are also known as my country's "Four Seafoods". Its distribution range is relatively wide, mainly concentrated in the Bohai Sea, the Yellow Sea, the East China Sea and the sea area on the west coast of the Korean Peninsula where the water depth is less than 100m. With the continuous development of fishery equipment and fishing technology, the resources of small yellow croaker are seriously threatened by overfishing, coupled with the impact of environmental deterioration and other factors, resulting in a sharp decline in the catch of small yellow croaker, and the fishery population structure of small yellow croaker also appears such as younger age, miniaturization, sex Maturity ad...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems that most small yellow croakers are small in size and the economic benefits are not obvious, the present invention provides a method for early breeding and rapid seedling raising of small yellow croakers. By establishing a rapid seedling raising method for small yellow croakers, it is expected to improve the size of small yellow croakers and shorten the emergence of small yellow croakers. Time, to achieve early emergence of small yellow croaker, early listing, high seed prices, so as to obtain good economic benefits, can alleviate the market demand for large-scale small yellow croaker products, and also provide a way to protect small yellow croaker fishery resources in the East China Sea

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