青鱼是我国主要养殖鱼类,产量高、经济效益较好。但目前采用的养殖方式,由于放养密度过大,生态条件较差,抑制了青鱼的正常生长,致使饲养周期过长。一般从鱼苗养成食用鱼多数要四年,前三年是鱼种养殖阶段,第四年才是食用鱼养殖阶段。由于青鱼长期生活在密集的环境中,又经过多次起 Herring is China’s major cultured fish, high yield, good economic returns. However, the current breeding methods, due to stocking density is too large, poor ecological conditions, inhibit the normal growth of herring, resulting in feeding cycle is too long. Generally raised fish from fish to eat most of the fish to four years, the first three years is the stage of breeding fish species, the fourth year is the stage of food fish farming. As long-term survival of herring in a dense environment, and after many times