Method for cultivating cold-resistance gift tilapia

Abstract

The invention discloses a method for cultivating cold-resistance gift tilapia. The method adopts the establishment of a plurality of pedigrees and selects a pedigree of which an average cold-resistance variance is higher than a total variance as a primitive pedigree through a cold-resistance test. In the May of the following year, a female and a male of the primitive pedigree mate for propagation. After emergency from eggs, fish fry passes through growth selection and cold-resistance selection as well as a growth comparison test to select a pedigree growing faster than a reference gift tilapia and having a cold-resistance variance higher than a cold-resistance total variance of the time as the first pedigree. The selection and the test are both carried in a mesh box. The first pedigree is protected as parent stock in winter and passes the selection of a second pedigree in the same way in the following year. Researches show that the total variance of the cold-resistance selection is obviously higher year by year. Through selection generation by generation, gift tilapia which grows fast and is fully improved in cold resistance can be obtained.

Description

technical field [0001] The invention belongs to the technical field of fish breeding, in particular to the technology for cultivating cold-resistant strains of tilapia. Background technique [0002] The Jifu strain tilapia has the most growth advantage, but its cold resistance is weaker than that of the current domestic breed Aoni hybrid tilapia. The improvement of its cold resistance performance can become an alternative species for tilapia farming. The cold resistance traits of fish are the focus of fish breeding research and also the bottleneck restricting the development of fish industry. At present, there are not many reports on the cold resistance of fish, which are limited to the temperature adaptation mechanism of fish, the impact of low temperature on tilapia, and the cold resistance performance comparison of existing strains of tilapia, and the low temperature acclimation or continuous low temperature selection. However, there is no research on the method and meas...

AI Technical Summary

Problems solved by technology

At present, there are not many reports on the cold resistance of fish, which are limited to the temperature adaptation mechanism of fish, the impact of low temperature on tilapia, and the comparison of cold resistance performance of existing strains of tilapia, and the low temperature acclimation or continuous low temperature selection. The possibility of improving the low temperature tolerance of tilapia through breeding methods has not yet been studied. Methods and measures for improving the cold resistance of tilapia

In terms of molecular biology, some research has been done on cold resistance genes, but it is difficult to apply them to actual production in the short term.