Ecology regulation and control method for delaying sex reversal time of eels

Abstract

The invention relates to an ecology regulation and control method for delaying the sex reversal time of eels. The ecology regulation and control method for delaying the sex reversal time of the eels is characterized in that under an ecology imitation condition, young eels with the same specification are massively produced, and moreover, with the adoption of a pond net cage breeding method, the young eels obtained in the same year are bred and overwinter to grow into 30-40g 1-full-age eels; and after the overwintering, the 30-40g 1-full-age eels are fed for one year with high protein nutrients at a high density in a pond net cage, wherein the feeding density is 50-80 eels per square meter and the feed protein content is 40% to 42%. Through the method, 2-winter-age female eel parents with great brood amount and an individual specification of more than 100g can be produced; the colony reproductive capacity of the female eel parents can be improved by 200% to 300%; the quantity of the produced young eels is correspondingly improved by 200% to 300%; and therefore, the demand on the large-scale breeding of the young eels can be met.

Description

Technical field: [0001] The invention relates to an ecological control method for delaying eel's sex transition time, and 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 trans...

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 eel in its life history, that is, 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, eventually lead to problems such as small individual and fecundity of female eel parents and uncoordinated individual size of male and female parents in the process of artificial reproduction, and the number and scale of seed reproduction are limited