Method for breeding gift tilapia fries with high male ratio through temperature induction

Abstract

The invention belongs to the aquatic animal sex control technology and in particular relates to a breeding method capable of improving the male ratio of gift tilapia fries. The male tilapia grows faster than the female tilapia by 30-50% under the same conditions; therefore the male ratio is improved as much as possible when tilapia is bred. To improve the male ratio of the reproduced gift tilapia and give play to the breeding advantage of the gift tilapia with high male ratio, the invention provides an artificial fry breeding method for improving the male ratio of the reproduced gift tilapia through water temperature control, comprising the following steps: 1. breeding pool preparation; 2. fry source; 3. water injection and fry putting; and 4. temperature control and raising management. The method not only can substantially improve the male ratio, but also does not produce any toxic or side effect, is simple and practical, ensures the male ratio of the bred fries to be over 90% and is suitable for ordinary gift tilapia fry breeding farms.

Description

Technical field [0001] The present invention belongs to aquaculture gender control technology, and specifically relates to a breeding method capable of increasing the male ratio of Gifford tilapia fry. Background technique [0002] Many fish have different growth rates between males and females. This kind of unisex culture is often used in aquaculture to increase production. Tilapia males grow faster than females, 30%-50% faster under the same conditions, so try to increase the male rate when raising tilapia. The methods to increase the male rate of tilapia are as follows: 1. Increase the male rate through cross-breeding. For example, the male rate of hybrid tilapia (Oriya tilapia ♂×Nile tilapia ♀) can reach 90%. Above; 2. Feeding feed containing sex hormones at a certain stage of seedling can also increase the percentage of males or females. At present, the new breed of Gifu tilapia is a new breed cultivated from Nile tilapia after years of selection and breeding. It has the c...

AI Technical Summary

Problems solved by technology

[0003] The breeding efficiency of Gifu tilapia hybridized with other tilapias is low, the male rate is not high enough, and the hybridization has also changed the unique excellent traits of Gifu tilapia; the food safety of using hormones to induce male fish is not easy to be accepted by people, some The country bans the use of sex hormones