All female method for salmon and bulltrout

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 ...

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This technique has been expressly prohibited from being used in production