Method of sex reversal of Java tilapia from female to male

Abstract

The invention discloses a male transfer method for java tilapia. The method comprises the steps that by adopting a physical method, young fish of java tilapia is cultured in a rearing pond for four to six days at 35 to 37 DEG C with the culture density of 15000 to 20000 per cubic meter, then the culture density is reduced to 10000 per cubic meter to culture the young fish for ten days at 25 to 30 DEG C, and then java tilapia with high male rate can be obtained; wherein, dissolved oxygen in the rearing pond is larger than 2 milligram/liter, ammonia nitrogen is smaller than 0.5 milligram/liter, and the pH value is 6.5 to 8. The sex of java tilapia is controlled through the physical method in the invention, so that hormone feeding, culture of super male parent fish and interspecific hybridization are not required, and the male rate can reach above 95 percent. The method of the invention is easy to operate, guarantees the food safety of cultured fishes, and is favorable for environmental protection; at the same time, the method of the invention can realize mass production, impurity and degradation can not happen among germplasms, and thereby the superiority of breeds can be guaranteed.

Description

A kind of tilapia transfer male method technical field The invention relates to the field of fish breeding, in particular to a method for male-transforming tilapia. Background technique Tilapia is a warm-water fish belonging to the order Perciformes and the family Cichlidae, native to the brackish waters of the African continent and the Middle East. Tilapia has the characteristics of delicious meat, fast growth, high yield, disease resistance and strong adaptability. It has been recommended to countries all over the world by the Food and Agriculture Organization of the United Nations (FAO), and has become an internationally important farmed fish. However, it should be pointed out that over-breeding of tilapia easily leads to poor specifications and quality of commercial fish, which is not conducive to the healthy development of its aquaculture industry. Therefore, how to suppress its reproduction has always been the concern of the world. Scientific research and producti...

AI Technical Summary

Problems solved by technology

However, these three methods have certain defects. For example, the hormone method involves food safety and environmental safety issues. The super-male method cannot be mass-produced because the production technology of super-male broodstock is difficult to promote. The hybridization method is easy to cause germplasm mixing and degradation.