Breeding method of excellent breeds of genetically improved farmed tilapia resistant to streptococcus agalactiae

A technology for tilapia and Streptococcus lactis, which is applied in fish farming, application, climate change adaptation, etc., can solve the problems of disease resistance, poor resistance to stress and cold, low seedling yield, slow growth rate, etc. The effect is obvious, the growth rate is fast, and the disease resistance is strong

Inactive Publication Date: 2017-04-26
GUANGXI ACADEMY OF FISHERY SCI
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AI Technical Summary

Problems solved by technology

However, Gifu tilapia generally has shortcomings such as disease resistance, stress resistance, and poor cold resistance.
Oni tilapia is a distant hybrid of Nile tilapia and Olia tilapia. It is better than Gifu tilapia in terms of disease resistance, cold resistance and salt tolerance, but its disadvantage is the number of seedlings. low growth rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] The present invention will be further described below in conjunction with the examples.

[0028] 1. Evaluation of the resistance to Streptococcus agalactiasis of Gift tilapia in different geographical populations

[0029] An experiment of artificial infection with Streptococcus agalactiae was carried out on the three geographic populations of "Jiaji", "Baigui" and "Qingdao" protected by the unit. 300 fishes (weight specification: 60-80g) were randomly selected from each population, and 3 parallels were set for each population. Agricultural feed company No. 2 extruded material) 1 time. Then, artificial intraperitoneal injection was performed to infect Streptococcus agalactiae (strain HN016), and the concentration of the bacterial solution was about 1.70×10 7 cfu / mL, the injection dose is 0.3Ml, after injection infection, the experimental fish are cultured in large buckets with a water temperature of 30-31 °C, and the number of diseased and dead fish in each bucket is r...

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Abstract

The invention discloses a breeding method of excellent breeds of genetically improved farmed tilapia resistant to streptococcus agalactiae. Streptococcus agalactiae artificial infection is conducted on genetically improved farmed tilapia of different geographical species to evaluate the disease-resistance performance of the species, and the geographical species with high geographical species are screened out to form streptococcus agalactiae-resistant breeding basic groups. Streptococcus agalactiae resistance performance is taken as a major trait and the growth speed is taken as an auxiliary trait, selection among families and within families is carried out through an animal model best linear unbiased prediction (BLUP) method. Tilapia fingerlings are reserved for breeding according to a comprehensive breeding value and genetic backgrounds of the species, and excellent breeds of genetically improved farmed tilapia that exhibit streptococcus agalactiae resistance performance and grow fast are selected and bred through generations of breeding assessment.

Description

technical field [0001] The invention belongs to the technical field of fish breeding, in particular to a breeding method for an excellent strain resistant to Streptococcus agalactiae of tilapia. Background technique [0002] Tilapia is an international aquaculture fish and trade aquatic product promoted by the United Nations Food and Agriculture Organization (FAO), and has a broad consumer market at home and abroad. Tilapia aquaculture is the pillar industry of my country's aquaculture, and it is also the leading aquaculture species in my country's aquaculture. In the past ten years, with the rapid development of scale and intensification of tilapia aquaculture, diseases have become more and more serious, among which Streptococcus agalactiae caused by Streptococcus agalactiae is the most troublesome. The disease not only has a high mortality rate, but also has an extremely fast rate of death and spread, making it extremely difficult to treat. From 2009 to 2016, streptococc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01K61/10
CPCA01K61/00Y02A40/81
Inventor 朱佳杰甘西敖秋桅谭芸罗永巨梁军能陈明李莉萍
Owner GUANGXI ACADEMY OF FISHERY SCI
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