Directional breeding method of female parents of finless eel

A technology of female and parent, which is applied in the field of directional cultivation of rice field eel female parents, can solve the problem of limited number and scale of seed reproduction, small amount of female eel parents and eggs, stocking time, quality and quantity, and sources that cannot meet the needs of eel farming Scale and industrialization needs and other issues, to meet the requirements of seedlings, improve the effect of colony fecundity

Inactive Publication Date: 2014-10-01
YANGTZE UNIVERSITY
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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

Method used

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Embodiment Construction

[0019] Implement the present invention, take the Jianghan Plain area as an example, can carry out according to the following steps:

[0020] (1) Artificial breeding to obtain 1-year-old eel with uniform development:

[0021] Put the net cage with a specification of 100cm×150cm×100cm into the paddy field, spread 10-15cm of soil on the bottom of the cage, and then inject water into the paddy field. The water level should be 8-10cm above the soil surface in the cage; Several water hyacinths are floated in the net cage as a place for parents to build nests, mate and lay eggs, and fertilized eggs hatch and emerge. In the middle of May of that year, 2 sexually mature female and 2 male parents were placed in the net cage, and artificially cultivated for about 15 days, allowing them to lay eggs, fertilize and hatch naturally in June to July, and collect eel species in batches after emergence The seedlings were transferred to pond cages for cultivation until June to July of the follow...

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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...

Claims

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Application Information

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IPC IPC(8): A01K61/00
CPCY02A40/81
Inventor 杨代勤阮国良苏应兵陈芳
Owner YANGTZE UNIVERSITY
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