Breeding method of all-male hybrid snakehead

Abstract

The invention belongs to the technical field of fish breeding, and discloses a breeding method of all-male hybrid snakehead. The method includes the following steps of bred channa maculata sex reversal, identification of pseudo-female fishes, reproduction of the pseudo-female fishes, identification of super-male fishes and expanding propagation of the super-male fishes. By using the method, the all-male hybrid snakehead can be bred, and the male rate is 93% or above; after being bred for 7 months, the all-male varieties are increased by 8% or above in yield compared with normal varieties, andthe all-male varieties with the height of 2 jin or more are increased by 15%; the coefficient of a novel fish feed in the current year of breeding is reduced by 0.1; after being bred for 7 months, theall-male varieties are increased by 26.6% in yield compared with normal varieties, and the feed coefficient is reduced by 0.175-0.21. The new varieties 'hybrid snakehead' obtained through hybridization have the advantages of being high in growth speed and strong in low temperature resistance, can replace snakehead breeding in the north area and become national breeding varieties.

Description

technical field [0001] The invention belongs to the technical field of fish breeding, and in particular relates to a method for cultivating all-male black spotted hybrid snakehead. Background technique [0002] Currently, the closest prior art: [0003] Channa is an important freshwater high-quality economic fish in my country. It has the characteristics of less bone spurs, fresh and tender meat, and rich nutrition. [0004] At present, the main breeding species in the south of the Yangtze River and South China is the hybrid snakehead, which is obtained by crossing the snakehead as the female parent and the snakehead as the male parent. The snakehead is mainly cultivated in the Yellow River and the north. Because snakeheads can only eat chilled fish or live bait, the water quality is seriously polluted, and breeding has been restricted or prohibited in many areas. The hybrid snakehead is not cold-resistant and cannot be extended to northern regions. [0005] The unit uses...

AI Technical Summary

Problems solved by technology

[0008] (1) In the prior art, the new variety obtained by continuous breeding of 4 generations of spotted snakeheads and 2 generations of black snakeheads as the parents of fine-bred lines only solves the problems of cold resistance and growth speed, but does not solve the problem of the sex of snakeheads The problem of large differences, in which the female individual is small, and after sexual maturity, the egg will increase the feed coefficient and increase the cost of breeding

[0009] (2) Channa commercial fish are priced according to specifications, and the market price of individuals over 1kg is more than 50% higher than that of individuals under 1kg, and the proportion of small females increases, which reduces the overall price and seriously affects the income of fishermen

This consumes a lot of labor and increases expenditure

[0011] (4) The existing technology uses the method of gynogenesis to produce and multiply YY super male snakehead. The identification of pseudo female fish needs to use the sex of the offspring to infer the genotype of the parents, and the survival rate of the offspring of gynogenesis is very low, and the efficiency of parent preparation is very low. very low

The main technical obstacles lie in the molecular identification of pseudo female fish and super male fish, and the inability of pseudo female fish or super male fish to reproduce, etc.

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