A low-oxygen tolerance breeding method for bream

Abstract

The invention discloses a breeding method for bream: selecting a group of bream with distant kinship and good hypoxia resistance as the parent group of the F0 generation; selecting a group of bream with good growth performance in stages for the parent group of the F0 generation , obtain the selection population of the 1st age stage and the 2nd age stage of the F0 generation parental population of the group head bream, that is, the F1 generation group; to the selection of the F1 generation group of the group head bream, obtain the selection of the 2 age stage of the F1 generation group reproduction population; the first hypoxic stress and the second hypoxic stress are carried out on the selected population of the 2nd age stage of the F1 generation population breeding, and the F2 generation population is obtained; multiple family groups are constructed from the F2 generation population, and the third time is carried out respectively. Hypoxic stress and the fourth hypoxic stress were used to obtain the F3 generation population of the group head bream; for the population selection of the first-year-old population of the F3 generation parental group, the group with good growth performance was selected to obtain the first-year-old group of the F3 generation parental group of the grouper bream and the selection group at the 2nd instar stage, that is, the F4 generation group of bream.

Description

technical field [0001] The invention belongs to the field of aquatic breeding and relates to a breeding method for bream. Background technique [0002] Group head bream (Megalobrama amblycephala, Yih), Cypriniformes, Cyprinidae, Cultrinae, Megalobrama, commonly known as Wuchang fish, bream, belongs to Cypriniformes, Cyprinidae , the subfamily of bream, the genus bream, is native to some large and medium-sized lakes in the middle reaches of the Yangtze River such as Poyang Lake and Liangzi Lake. It is one of the important herbivorous economic fish in my country. Compared with the bulk freshwater cultured fish species such as grass carp, carp, and crucian carp, bream is not resistant to low oxygen and is more sensitive to changes in dissolved oxygen in the cultured water. Hypoxia tends to make the group of bream "floating", causing problems such as decreased food intake, indigestion, disease resistance and immunity, and causes a decrease in growth rate and death, which limits ...

AI Technical Summary

Problems solved by technology

For example, the breeding of the group head bream "Pujiang No. 1" is mainly aimed at growth traits and body shape, and the breeding of low-oxygen tolerance performance has not been carried out.

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