Method for hatching gift tilapia with high-male-rate

Abstract

Gift tilapia is a new strain bred from Nile tilapia, and has the characteristics of fast growth, good body type and tender meat. As the growth rate of male tilapia is faster than that of female tilapia, the increase of the proportion of male gift tilapia can greatly improve the culture efficiency. Aiming at the situations, by a method of controlling the temperature condition of hatching water, the invention provides a method for hatching the gift tilapia with high-male-rate. The method can raise the male rate of the gift tilapia from the prior 50 percent to over 90 percent, namely by 40 percent, thus the yield of the gift tilapia can be raised by more than 10 percent than before at least. Meanwhile, as the proportion of female gift tilapia is greatly reduced, and bred fry in culture ponds greatly decrease, so that the contradiction that the fry and adult fishes fight for water and bait is avoided.

Description

technical field [0001] The invention relates to a breeding technology of tilapia, in particular to a sex control technology for the hatching of Gifu tilapia. Background technique [0002] Gifu tilapia is a new strain selected from Nile tilapia, also known as Gifu strain Nile tilapia. It has the characteristics of fast growth, good shape, and tender meat, and is deeply loved by farmers. The area continues to expand. The male to female ratio of Gifu tilapia in the natural population state is close to 1:1. Since the male of Tilapia grows faster than the female, increasing the male ratio of Gifu tilapia can greatly improve the breeding efficiency. [0003] At present, the general method to improve the male rate of tilapia is through hybridization between different tilapia strains, that is, the male and female broodstock naturally mate, spawn and hatch naturally in the pond. For example, the current main breeding object is Aoni hybrid fish (oria tilapia male × Nile tilapia fema...

AI Technical Summary

Problems solved by technology

The hybridization of Gifu tilapia and Olia tilapia has low seedling efficiency, the male rate is not high enough, and the hybridization has also changed the excellent traits of Gifu tilapia; the food safety of using hormones to induce male fish is not easy to be accepted by people. Some countries ban the use of sex hormones

[0004] By controlling the incubation temperature to achieve the purpose of controlling the sex of offspring, it has been successful in reptiles such as crocodiles, but no substantive research and experiments have been carried out on fish