Breeding method of hybrid bream

Abstract

The invention discloses a breeding method of hybrid bream. The method comprises the steps: selecting the backcross progeny of female diploid F<1> hybrid (blunt snout bream x topmouth culter) x male blunt snout bream (BTB for short) (with a Chinese name of Qiaozuibian) and Megalobrama amblycephala, and performing culture in a special pond in a mating period, wherein the BTB and Megalobrama amblycephala have obvious sexual characteristics and good physical signs; performing artificial induced spawning on the parent fishes in the breeding season, performing natural fertilization, putting the obtained fertilized eggs in an incubation tank, performing incubation in running water, raising the fry after completion of fry incubation, and then performing detection and screening on the raised fry soas to obtain the improved diploid hybrid bream. Through the breeding method of the hybrid bream, ecbolic of a low dose is adopted for induced spawning, and is combined with natural fertilization, sothat smooth induced spawning and a survival rate of the parent fishes are ensured, the cost of induced spawning is reduced, and it is ensured that the fertility rate and hatching rate are not affected; and the whole breeding process is simple, the obtained improved diploid hybrid bream has the characteristics of fast growth, beautiful bodies, rich nutrition, hypoxia tolerance, good resistance to diseases, good stress resistance and the like, and the method has great significance to genetic breeding and production practice.

Description

technical field [0001] The invention belongs to the technical field of fish hybridization, and in particular relates to a cultivation method for preparing a new type of hybrid bream. Background technique [0002] Hybridization can transfer the genome from one species to another, resulting in changes in the phenotype and genotype of the offspring, making hybrid offspring exhibit heterosis in terms of meat quality, disease resistance, stress resistance, and growth rate. Hybridization to form fertile strains provides an important germplasm resource bank for genetic breeding, which is of great significance in genetic breeding. How to quickly form a new type of hybrid fish with existing methods and technologies is a problem to be solved by those skilled in the art. [0003] Group head bream (Megalobrama amblycephala) belongs to Cyprinidae, Cyprinidae, Cyprinidae, and bream genus. Dory bream is one of the main freshwater cultured fishes in my country and is widely loved by peopl...

AI Technical Summary

Problems solved by technology

However, in recent years, it has been found in the breeding process that due to the inbreeding of the bream, the growth of the bream has declined, the meat quality of the bream has deteriorated, the growth rate has slowed down, and it is extremely intolerant to low oxygen. The improvement of quality resources is imperative

The bream is derived from the bream strain, which has fast growth rate, strong stress resistance, good meat quality, low oxygen tolerance, and strong stress resistance, but the bream will segregate and its biological characteristics are unstable

And in the previous artificial oxytocin and artificial insemination, a high dose of progesterone-releasing hormone, chorionic gonadotropin and dioconone mixed oxytocic agent was used to induce labor, resulting in a higher mortality rate of the postpartum parents.

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