目前罗非鱼养殖中最大的难题是不能有效而又经济地控制其繁殖,故往往种群密度太大,上市规格太小,产品质量不高。通过杂交和单性选择全雄个体养殖,而雄性激素和抗促性腺物质用于产生的雄性个体,对其生理代谢似乎有一定的 At present, the biggest problem of tilapia farming is that it can not control its breeding effectively and economically. Therefore, population density is often too large, the market size is too small, and the product quality is not high. Male individuals are bred by crossing and uniparental selection, whereas male and anti-gonadotropic substances are used to produce male individuals that appear to have some physiological metabolism