论文部分内容阅读
罗非鱼是世界性养殖鱼类,在水产养殖业中占有重要地位,它的年产量仅次于鲤科鱼类而居第二位。我国自1978年引进尼罗罗非鱼以来(以下简称尼罗鱼),无论单养或混养都可增加单位面积产量。但是由于罗非鱼生殖周期短,导致过度繁殖,种群密度过大,结果鱼体规格日趋小型化。另外通过生产实践表明雌雄性罗非鱼生长具有明显差异,雄性鱼生长快于雌性鱼1-2倍。因此国内外有关单位采用人工方法控制罗非鱼性别来生产雄性鱼。目前控制罗非鱼性别的途径有人工挑选、种间杂交、性激素处理、生理遗传技术等。从目前结果看,唯有用杂交的方
Tilapia is a worldwide farmed fish that holds an important place in the aquaculture industry and ranks second only to the annual production of carps. Since the introduction of Nile tilapia in China in 1978 (hereinafter referred to as the Nile fish), both monoculture and polyculture can increase yield per unit area. However, due to the short reproductive cycle of tilapia, resulting in over-breeding, population density is too large, resulting in increasingly smaller size of the fish body. In addition, through production practices showed that male and female tilapia growth has significant differences, male fish grow faster than female fish 1-2 times. Therefore, the relevant units at home and abroad use artificial methods to control the sex of tilapia to produce male fish. At present, the methods for controlling the sex of tilapia are artificially selected, interspecific hybridization, sex hormone treatment and physiological and genetic technologies. From the current results, only with the hybrid side