Method for establishment of hybrid strain between bluntsnout bream and topmouth culter and breeding method of topmouth bream

Abstract

The invention discloses a method for establishment of a hybrid strain between bluntsnout bream and topmouth culter. The bluntsnout bream is used as a female parent, the topmouth culter is used as a male parent, the hybrid strain F1 of the bluntsnout bream and the topmouth culter is obtained through distant hybridization and is then bred and tested to obtain a bisexual fertile F1; then F1 is cultured as an object, selfing of the bisexual fertile F1 is performed, and a diploid F2 of the bluntsnout bream and the topmouth culter is obtained through incubation and breeding; and the ploidy and sterility of F2 are tested to obtain a bisexual fertile F2, and thus the heterologous bream and culter stain with genetic stability and bisexual sterility is obtained. The invention also discloses a breeding method of topmouth bream. The bisexual fertile diploid hybrid strain F1 of the bluntsnout bream and the topmouth culter and the bisexual fertile F2 of the bluntsnout bream and the topmouth culter are obtained by the establishment method, and backcross breeding is performed with the bluntsnout bream to obtain the hybrid topmouth bream. By adopting the breeding method, the novel hybrid topmouth bream with characteristics of high growth speed, high resistance, high meat quality, attractive shape and the like can be prepared.

Description

technical field [0001] The invention relates to a method for distant hybrid breeding of fish, in particular to a method for establishing a hermaphrodite fertile heterologous strain through distant hybrid technology and a method for preparing a new type of hybrid fish by utilizing the fertile heterologous strain. Background technique [0002] Distant hybridization can transfer the genome from one species to another, resulting in changes in both the phenotype and genotype of the hybrid offspring. If distant hybridization can form fertile heterologous lines, it provides an important opportunity for genetic breeding. The germplasm resource bank is of great significance in genetic breeding. Distant hybridization can promote the occurrence of polyploidy and may form hybrid offspring with hybrid vigor, and has been proven to be an effective method to form sexually fertile allotetraploid fish. Fertile allotetraploid fish can not only be used as an important model animal in the basi...

AI Technical Summary

Problems solved by technology

[0005] In the prior art, there have been no related reports on the use of distant hybridization technology to cultivate sexually fertile heterologous bream strains and to prepare bream by using fertile bream strains

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