All female method for salmon and bulltrout

A technology for salmon trout and salmon trout, applied in the field of full femaleization of salmon trout

Inactive Publication Date: 2008-02-13
白宝海
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  • Summary
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  • Claims
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Problems solved by technology

This technique has been expressly prohibited from being used in production

Method used

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Embodiment Construction

[0004] Take methyltestosterone in an amount of 5-10ppm, dissolve it in ethanol with a purity of more than 95%, mix the dissolved methyltestosterone with feed, and dry in the shade in a ventilated place.

[0005] When the salmon and trout fry are just starting to eat, they are fed this feed containing methyltestosterone and continue to feed for 3-6 months. Then stop feeding methyltestosterone, and change to normal feeding until sexual maturity.

[0006] In sexually mature individuals, the selection is in terms of morphology: the lower jaw is slightly longer than the upper jaw, the front of the lower jaw protrudes upwards, and the tip of the snout; in terms of physiology: "false male fish" with testes.

[0007] Take out the testis of the "false male fish", grind the testis with a mortar, and pass through the universal sperm diluent (commonly used formula is NaCl 7.6g, KCl 2.98g, CaCl 2 .2H 2 O 0.37g, MgCl 2 .6H 2 O 0.37g, NaHCO 3 0.21g, add distilled water to 1000ml) to di...

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Abstract

The present invention relates to a gender artificial-control technique of the cultivated fish, in particular to a gender control technique of the all-female-orientation of the salmon and bulltrout. Using the estrogen hormone to feed the normal fry transforms the male fry to be a fake-male fish with the female shape feature and the male physiological feature; using the sperm of the fake-male fish to fertilize the normal egg can realize that all offspring are female. When the fries of the salmon and bulltrout start to take food, the fries are fed with the feed containing methyl testosterone for three to six months and then the fries are fed with normal feed until the sex maturation. Selecting the fake-male fish with a female external morphological feature and a sex gland of the spermarium, taking out the spermarium, grinding the spermarium with a mortar, diluting the spermarium powder with the conventional sperm dilution, nursing the solution inside a refrigerator in four cent degrees for two to four hours, and then mating with the male fish to produce the all-female salmon and bulltrout. All fish output by the present invention are female; when in maturation, the ovary of the fish contains a plurality of fish roes that can be make into a featured dish or processed into the caviar, thereby improving the cultivation benefit.

Description

technical field [0001] The invention relates to a method for artificially controlling the sex of cultured fish, especially salmon trout, including rainbow trout, golden trout, Atlantic salmon and American char. Using the method of all-feminization of salmon and trout, all fish are produced as females. The ovaries on the left and right sides of the female abdomen contain larger and more fish eggs when mature, which can be used as raw materials to make special dishes or processed into caviar to improve breeding benefits. Background technique [0002] Currently farmed salmon and trout have a sex ratio of 1:1, or close to 1:1. That is to say, in the cultured commercial fish, half or nearly half of the quantity is male fish, and the testes of adult fish account for 5-15% of the body weight. Since they have no utilization value, they are discarded and the means of production are wasted. The existing salmon trout full feminization technology is to feed estrogen to fry, and under ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01K61/00A01K67/00
CPCY02A40/81
Inventor 白宝海
Owner 白宝海
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