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Tilapia all-male control technology
As the all-male of tilapia grows faster and the individuals are relatively large, it has become an object for everyone to compete for breeding. Here is a brief description of 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. Two methods, hydrostatic pressure or hydrostatic pressure combined with cold shock treatment, were used to inhibit the first cleavage-induced Tilapia tetraploid, allowing its tetraploid fish to mate with normal diploid fish to obtain a large amount of support. 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 7.50 c cold water treatment for 7 minutes before tilapia egg cleavage. However, due to the fact that the fish's autotetraploid induction method has a certain degree of difficulty, it has not yet been successfully propagated in large numbers. 2. Interspecific hybridization There are many well-equipped fry hatcheries using male Anopil tilapia and male Nile tilapia interbreeding. The resulting fry male offspring account for 90%-95%, and then This male offspring mates with this male offspring to produce all over male tilapia. This generation of super male tilapia, this generation of super male tilapia grows faster than its parent, but Cannot be preserved as a broodstock. The focus of this method is on the preservation of the female Nile tilapia 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 to cause The hatching of fry is not pure, and this method is now a good way to obtain a large number of male tilapia.