Method for selectively breeding excellent strains of saline-alkaline tolerant tilapia

Abstract

The invention discloses a method for selectively breeding excellent strains of saline-alkaline tolerant tilapia. The method includes steps of collecting at least three different strains of Nile tilapia to be used as selective breeding base population and evaluating the saline-alkaline tolerance; carrying out one-generation saline-alkaline tolerant selective breeding on the different strains of Nile tilapia in every year and continuously selectively breeding at least two generations; mixing the different strains of saline-alkaline tolerant Nile tilapia with obvious growth superiority with one another after saline-alkaline tolerant selective breeding is carried out on the different strains of saline-alkaline tolerant Nile tilapia, then carrying out saline-alkaline tolerant selective breedingon the different strains of saline-alkaline tolerant Nile tilapia and continuously selectively breeding at least four generations to obtain the saline-alkaline tolerant Nile tilapia of the excellentstrains. Saline-alkaline tolerant selective breeding procedures include reproduction pond preparing, parent tilapia selecting and rearing, fry hatching and fishing, screening and intensified culture and overwintering. The method has the advantages that the method is high in reliability, operability and efficiency; novel technical ways can be developed for selectively breeding stress-resistant varieties of fish, and the method has important significance and application value in popularization of rearing of stress-resistant improved varieties of cultured fish.

Description

technical field [0001] The invention belongs to the technical field of aquaculture, and in particular relates to a method for breeding an excellent strain of saline-alkali-tolerant tilapia. Background technique [0002] At present, the available fresh water resources for fishery production in my country are shrinking day by day, and there are about 31 million hm 2 In saline-alkali waters, the biological resources in most of the water bodies are relatively poor and basically idle. Rational use of saline-alkali water for aquaculture can transform the unconventional resource of saline-alkali water into regional characteristic economic advantages, while protecting and improving the environment , wherein the development of varieties suitable for saline-alkaline aquaculture is an important way to achieve this goal. [0003] Nile tilapia (Oreochromis niloticus) has excellent characteristics such as fast growth, delicious taste and few spines. It is an important breeding species fo...

AI Technical Summary

Problems solved by technology

[0004] In the process of developing excellent strains of saline-alkali-tolerant tilapia, there are problems such as poor operational feasibility, low breeding efficiency, and relatively simple adaptation to saline-alkaline environments, which affects production and promotion.

Among them, the salt-alkali tolerance breeding technology has the following disadvantages: 1) It is mainly a technical route formed for salinity stress, and the new tilapia varieties bred are also mainly salt-tolerant. It is possible to demonstrate farming in a wider area to maximize the fish farming industry

However, in reality, the environmental factors of water bodies in different aquaculture areas are very different, especially in saline-alkali water bodies, where the two stress factors of salinity and alkalinity exist at the same time, the impact on fish growth is more complicated, and the single salt-tolerant breeding technology and The variety is not suitable for widespread promotion in saline-alkali water bodies, which seriously restricts the industrialization of fine fish species; 2) large-scale family breeding requires a lot of manpower and material resources, and the breeding efficiency is low; 3) artificial insemination in hybrid breeding technology is difficult, The low hatch rate seriously limits the number of basic populations and the scale of breeding and seed production to a certain extent, which cannot meet production needs; 4) The polyploid breeding technology has high accidental components and the hatch rate is unstable; 5) Fish molecular marker-assisted breeding technology is It is still in its infancy at home and abroad, and it cannot be well applied in practice; 6) The application of transgenic breeding technology has always been controversial, especially when it comes to issues such as transgenic safety, and there is no precedent for it to be used in the production of aquatic economic animals

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