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Indoor domestication method for Japanese eel fries

A seedling and eel technology, which is applied in the field of indoor domestication of Japanese eel seedlings, can solve the problems of difficult collection of residual bait, difficult growth of transfer material, cumbersome process, etc., and achieves good application prospects, low cost and simple process

Inactive Publication Date: 2015-03-04
EAST CHINA SEA FISHERIES RES INST CHINESE ACAD OF FISHERY SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional breeding process of glass eels, water earthworms (commonly known as red worms) are used to open their mouths. However, this kind of open bait has the following disadvantages: (1) it carries a large number of pathogenic microorganisms such as bacteria and viruses, which is easy to cause diseases in eel fry; (2) residual The bait is not easy to collect, the waste is large, and it pollutes the breeding water; (3) in the domestication after the metamorphosis into a black eel, it is necessary to gradually reduce the amount of water earthworms in proportion and increase the amount of artificial feed. In the process of transitioning to powdered feed, it is easy to have difficult feed transfer and affect growth

Method used

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Effect test

Embodiment 1

[0018] The artificially captured glass eels were collected, transported to the laboratory, and temporarily kept in glass jars sterilized by potassium permanganate. The size of the glass jars was 70cm×40cm×50cm, and the size of the glass jars was adjusted appropriately according to actual needs. The salinity of the water body is consistent with the salinity of the captured water area, and 300 glass eels are temporarily kept in each tank, and the water depth is kept at 25cm. Place tiles and shelters at the bottom of the glass tank to provide a sheltered place for eel seedlings to inhabit. Oxygenation by the oxygen pump to keep the dissolved oxygen in the water above 6.0mg / L. Drain 1 / 5 of the seawater every day, and add 1 / 5 of the fresh water at the same time. After 5 days, the eel fry are completely transferred to the fresh water for cultivation. Days later, the water temperature rose to 25°C, and the water temperature at 25°C was kept constant. No bait is fed during the salt ...

Embodiment 2

[0022] The artificially captured glass eels were collected, transported to the laboratory, and temporarily kept in glass jars sterilized by potassium permanganate. The size of the glass jars was 70cm×40cm×50cm, and the size of the glass jars was adjusted appropriately according to actual needs. The salinity of the water body is consistent with the salinity of the captured water area, and 300 glass eels are temporarily kept in each tank, and the water depth is kept at 25cm. Place tiles and shelters at the bottom of the glass tank to provide a sheltered place for eel seedlings to inhabit. Oxygenation by the oxygen pump to keep the dissolved oxygen in the water above 6.0mg / L. Drain 1 / 5 of the seawater every day, and add 1 / 5 of the fresh water at the same time. After 5 days, the eel fry are completely transferred to the fresh water for cultivation. Days later, the water temperature rose to 25°C, and the water temperature at 25°C was kept constant. No bait is fed during the salt ...

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Abstract

The invention relates to an indoor domestication method for Japanese eel fries. The method comprises the following steps of completely shifting captured glass eels into fresh water for aquaculture by a method of gradually changing fresh water; directly feeding eel fries by taking frozen minced artificial formulated feed as initial feed, and taking an elaborated artificial feeding and management method as assistance; when the glass eels are changed into black fry eels, feeding with powdery artificial formulated feed, matching the weight of the feed and water according to a ratio, controlling the feeding quantity, regularly sucking dirt and changing water each day, and timely feeding individuals in different specifications in different ponds. The method is simple in process and low in cost, effectively overcomes the defect of adopting tubificidae as initial feed, ensures that the survival rate of the eel fries is over 99 percent int the domestication process, and has a good application prospect.

Description

technical field [0001] The invention belongs to the field of Japanese eel and relates to an indoor domestication method for Japanese eel seedlings Background technique [0002] my country is a big aquaculture country, and Japanese eel, as an excellent aquaculture object, is one of the leading varieties of my country's export earnings. However, the difficulty in the artificial propagation of its seed has not been overcome. So far, it is still only completely dependent on the natural seed collected in the estuary area on the way to support the large-scale eel breeding industry. After reaching the Yangtze River estuary, the eel fry metamorphose into translucent cylindrical larvae, called glass eels or white eels. Glass eels travel up the estuary, appearing melanin, and the back turns black, which is called black eels. The breeding and management of eel fry during metamorphosis are very important in artificial culture, and the opening feeding stage of glass eel is a critical pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01K61/00
CPCY02A40/81A01K61/00
Inventor 黄晓荣龚盼庄平章龙珍侯俊利赵峰刘鉴毅张涛冯广朋
Owner EAST CHINA SEA FISHERIES RES INST CHINESE ACAD OF FISHERY SCI
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