As all males of tilapia grow faster and the individuals are relatively large, they have become objects of competition. Based on my research in various aspects, I will now briefly introduce to you the transformation control technology of all male fish.
1. Physical control of artificially induced fish tetraploids is one of the main directions of fish genetics and breeding in recent years. Using hydrostatic or hydrostatic pressure combined with cold shock, two methods were used to inhibit the first cleavage-induced tilapia tetraploid, allowing its tetraploid fish to mate with normal diploid fish to obtain a large number of available The triploids produced by the aquaculture were all male tilapia, and the all-male triploid tilapia had no reproductive ability. Some foreign scholars have successfully induced tetraploid embryos by using 7500 psi pressure and 7.5 0 c cold water for 7 minutes before tilapia egg cleavage. However, due to the fact that the method of induction of fish tetraploids has certain difficulties in itself, it has not yet been successfully propagated in large numbers.
2, interspecific hybridization There are many well-equipped fry hatchery using male and female Nile tilapia hybrids Nile tilapia hybrids, the resulting fish male offspring accounted for 90% -95%, and then take This male offspring was paired with this female offspring and all of them were derived from super male tilapia. This generation of super-male tilapia grows faster than its father, but it cannot be preserved as a broodstock. The focus of this method is on the purity of male and female Nile tilapia, because the current river water contains a large number of other wild tilapia fish eggs, if the hatching water treatment is not good, it is easy Causes hatched fry to be impure. This method is now a good way to get a lot of male tilapia.
1. Physical control of artificially induced fish tetraploids is one of the main directions of fish genetics and breeding in recent years. Using hydrostatic or hydrostatic pressure combined with cold shock, two methods were used to inhibit the first cleavage-induced tilapia tetraploid, allowing its tetraploid fish to mate with normal diploid fish to obtain a large number of available The triploids produced by the aquaculture were all male tilapia, and the all-male triploid tilapia had no reproductive ability. Some foreign scholars have successfully induced tetraploid embryos by using 7500 psi pressure and 7.5 0 c cold water for 7 minutes before tilapia egg cleavage. However, due to the fact that the method of induction of fish tetraploids has certain difficulties in itself, it has not yet been successfully propagated in large numbers.
2, interspecific hybridization There are many well-equipped fry hatchery using male and female Nile tilapia hybrids Nile tilapia hybrids, the resulting fish male offspring accounted for 90% -95%, and then take This male offspring was paired with this female offspring and all of them were derived from super male tilapia. This generation of super-male tilapia grows faster than its father, but it cannot be preserved as a broodstock. The focus of this method is on the purity of male and female Nile tilapia, because the current river water contains a large number of other wild tilapia fish eggs, if the hatching water treatment is not good, it is easy Causes hatched fry to be impure. This method is now a good way to get a lot of male tilapia.