Establishment method and fry culture method of heterologous hybrid culter strain

Abstract

The invention discloses an establishment method and a fry culture method of a heterologous hybrid culter strain. The establishment method comprises the steps that erythroculter ilishaeformis in the Changjiang river system serves as a female parent, 'Pujiang No.1' megalobrama amblycephala serves as a male parent, artificial induced spawning, fertilization, hatching, fry culture and screening are carried out, and hermaphroditic fertile diploid hybrid culter F1 is obtained; the hybrid culter F1 and the male parent erythroculter ilishaeformis in the Changjiang river system are subjected to backcross, hatching and breeding are carried out, diploid hybrid culter F2 is obtained, and establishment of the heterologous hybrid culter strain is completed; the diploid hybrid culter F2 is subjected to self-cross, screening is carried out, hybrid culter F3 is obtained, hybrid culter F4 and hybrid culter F5 are obtained in the same way, and the stable heterologous hybrid culter strain is obtained. Compared with the prior art, by means of the establishment method of the heterologous hybrid culter strain, the novel hybrid fish, namely heterologous hybrid culter, which has the hybrid advantages of a high growing speed, tightly-closed scales, stable hypoxia resistance inheritance, hermaphroditic fertility and the like can be cultured, and great significance is achieved on the aspects of fish genetic breeding and biological evolution.

Description

technical field [0001] The invention relates to a fish distant hybrid breeding method, in particular to a method for constructing a heterologous hybrid catfish strain. Background technique [0002] Improved varieties are considered to be the first of the three foundations of aquaculture (improved varieties, feed, and water quality). Under the same conditions, improved varieties can significantly enhance disease resistance, increase production, and improve the economic effect of aquaculture. Distant hybridization refers to the hybridization of more than one genera, and is one of the main ways of breeding improved varieties. Compared with other vertebrates, fishes are more likely to perform distant hybridization. Hybrid breeding is widely used in the aquaculture field, resulting in the continuous birth of many new species with production advantages, which has brought huge economic benefits to the aquaculture industry. my country's aquatic animal hybrid breeding began in the 1...

AI Technical Summary

Problems solved by technology

Red bream is a strong carnivorous fish, with the advantages of tender meat and fast growth, but there are disadvantages such as small scales that are easy to fall off and get injured, low oxygen tolerance and high feed cost for artificial breeding.

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