Success of hybridization between tilapia and mandarin fish in freshwater

Introduction: the research group led by Xia Dequan, researcher and doctoral supervisor of Jiangsu freshwater fishery research center of China Academy of Fishery Sciences, finally achieved the success of hybridization between tilapia and mandarin fish (a major project of China Academy of Fishery Sciences) this year after several years of research, which is an innovative and significant achievement Although both tilapia and Siniperca belong to the Perciformes, tilapia belongs to the Cichlidae and Siniperca belongs to the ichthyinae Generally speaking, it is difficult to crossbreed between different families In his long-term research, Mr Xia Dequan was not discouraged by hundreds of failures, but persevered in the research, and finally got the hybrid fish this year, which is now in breeding This success mainly includes two key breakthroughs: ① the breakthrough of artificial propagation of tilapia is the dream of experts at home and abroad to solve This is because tilapia belongs to spawning fish for many times, and its propagation process is more complex than that of ordinary cultured fish Artificial reproduction of tilapia has not been solved at home and abroad Its reproduction mainly depends on natural spawning and fertilization It is difficult for people to get high-quality eggs with good maturity, and it also makes many research work (such as ploidy, gynogenesis, transgene, etc.) difficult to carry out on tilapia The problem of human reproduction of tilapia has been recognized as the main subject of genetic breeding of tilapia in the world Limit factors Mr Xia Dequan accumulated experience from numerous failures Through the identification of the maturity of the parent fish and the screening and optimization of various combinations of oxytocin, he was able to control the spawning of tilapia and obtain high-quality eggs and sperm ② The best conditions of hybridization and the treatment of fertilized eggs were optimized, which made the hybridization successful The far-reaching significance of the successful distant hybridization between tilapia and mandarin fish lies in: theoretically, it provides rich information for the study of the mechanism of fish distant hybridization; in production practice, tilapia and mandarin fish have their own characteristics Tilapia grows fast, has strong resistance to disease, and has a variety of eating habits, but the disadvantage is that they are not resistant to low temperature; mandarin fish is a rare breed of freshwater fish, with excellent meat taste, which is loved by people, but Its disadvantage is that it has to eat live food all its life, especially the open food is difficult to solve, which hinders the development of mandarin fish breeding industry The success of hybridization between tilapia and mandarin fish is likely to cultivate new varieties with better production characteristics than their parents, which is of great significance At present, Mr Xia Dequan is leading the research team to conduct more in-depth research on hybrid fish in order to make a greater breakthrough in the cultivation of new varieties of tilapia.