Directional breeding method of female parents of finless eel

Abstract

The invention relates to a directional breeding method of female parents of finless eel and belongs to the technical field of fishery science application. The directional breeding method of female parents of finless eel is characterized by comprising the steps of obtaining one-full-age eels growing consistently and having the individual specification of 30-40g by virtue of breeding in pond net cages under imitated ecological conditions, after overwintering, feeding the one-full-age eels of 30-40g in the pond net cages by high density and with high-protein nutrition for a year, namely the feeding density of 50-80 eels per square meter and the feed protein content of 40%-42%, and postponing the sex reversal of the parents of the eels by more than 12 months, thereby obtaining two winter-age female eel parents having large brood amount and the individual specification of more than 100g; the population fertility of the female eel parents can be improved by 200%-300% and the number of the bred eel seedlings is also improved by 200%-300% correspondingly; as a result, the population fertility of the female eel parents is effectively improved and the requirements of large-scale eel breeding on the seedlings can be met.

Description

Technical field: [0001] The invention relates to a method for directional breeding of eel female parents, which belongs to the technical field of fishery science application. Background technique: [0002] Eel is one of the freshwater famous and high-quality fish that has developed rapidly in recent years in my country. Its main breeding areas are located in Hubei, Hunan, Anhui, Jiangxi, Zhejiang and other provinces in the middle and lower reaches of the Yangtze River; eel farming has become an important part of the aquaculture industry in these areas. leading industry. [0003] But at present, the seedlings required for eel farming are mainly wild resources, and the wild eel seedlings cannot meet the scale and industrialization needs of eel farming in terms of stocking time, quality, quantity and source. Therefore, The artificial mass production of eel fry is an inevitable requirement for large-scale eel cultivation. However, there is a phenomenon of sexual transition in t...

AI Technical Summary

Problems solved by technology

[0003] However, at present, the seedlings required for eel farming are mainly wild resources, and wild eel seedlings cannot meet the needs of large-scale and industrialized eel farming in terms of stocking time, quality, quantity, and source. Therefore, The manual mass production of eel fry is an inevitable requirement for large-scale eel cultivation

However, there is a phenomenon of sexual transition in the eel in its life history, that is, the eel is a small functional female before the first sexual maturity and spawning, and then undergoes a sexual transition after spawning, and gradually becomes a larger functional female. male, which ultimately leads to problems such as the small number of individuals and fecundity of female eel parents in the process of artificial reproduction, and the inconsistency of the size of male and female parents, and the number and scale of seed reproduction are limited.