A kind of breeding method of fast-growing and stress-resistant sea cucumber new strain

Abstract

The invention provides a breeding method of a fast-growing stress-resistant new stichopus japonicus strain. The method includes the steps that female stichopus japonicus and male stichopus japonicus are selected as parents for temperature-controlled acclimatization and maturity promotion; 5-7 days after culture, stimulation-induced spawning is carried out; after settlement and metamorphosis of young stichopus japonicus, high-temperature acclimatization and low-salt acclimatization are alternately carried out once every two months, and a first filial generation of stichopus japonicus is bred; when the first filial generation of bred stichopus japonicus grows and matures, a second filial generation of stichopus japonicus is bred; when the second filial generation of bred stichopus japonicus grows and matures, a third filial generation of stichopus japonicus is bred; the fast-growing stress-resistant new stichopus japonicus strain can be obtained through 2-3 generations of breeding. By means of the method, the fast-growing stress-resistant new stichopus japonicus strain with the complex characters of fast growth, high temperature resistance, low salt resistance and the like is obtained, the stichopus japonicus is stable in inheritance, the cost is low, and industrialized popularization is easy.

Description

technical field [0001] The invention belongs to the field of mariculture, and in particular relates to a method for selecting and breeding new strains of fast-growing and stress-resistant sea cucumbers. Background technique [0002] For a long time, the production of japonicus seedlings used for breeding in my country has mostly been self-propagating in small groups and inbreeding, and the phenomenon of germplasm degradation has become increasingly serious, which is prominently reflected in low survival rate, poor stress resistance, and slow growth. Especially since the rapid expansion of sea cucumber breeding space in the estuary bay area and southern regions such as Fujian, due to the lack of high-quality and high-resistant sea cucumber varieties suitable for "low-salt, high-temperature" environments, the unit yield of sea cucumbers is only the original sea cucumber in Jiaodong area. 1 / 3 of the production area has seriously affected the production efficiency and restricted t...

AI Technical Summary

Problems solved by technology

[0003] Based on the above-mentioned industrial status and existing problems, the present invention combines its germplasm characteristics, genetic laws and related basic knowledge of biology on the basis of selective breeding and hybrid breeding of sea cucumbers, and through innovation and optimization of traditional breeding techniques, selects Breeding improved japonicus japonicus species with fast growth, high temperature resistance, and low salt tolerance, can also greatly reduce the cost of japonicus seed conservation and seed production, and improve breeding efficiency, thereby solving the problem of high input costs, Technical problems such as single target traits, long breeding cycle, unstable genetic effects, and poor capacity for large-scale seed production

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