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选留好亲鱼是人工繁殖鱼苗成功的关键一环。亲鱼随着繁殖次数的增加,生殖能力逐年下降,所以每年都应补充新的,淘汰老的可以预先在成鱼池中留一些2龄以上的雌鱼或雄鱼蓄养,留作亲鱼,以后相应配放雄鱼和雌鱼。其选留关键是:1.选留时间最好在春节前(即大量捕捞成鱼时)选留亲鱼。这时选留亲鱼因鱼的摄食量减少,活动缓慢,鳞片紧,而不易受伤。2.选留年龄养殖鱼类的性成
Choosing to keep good broodstock is a key part of the success of artificial breeding fry. Broodstock with the increase in the number of reproductive, reproductive capacity decreased year by year, so each year should add new, out of the old can be pre-existing in the fish pond to stay some 2 or more years old female or male storage, broodstock, after the corresponding Put the male and female fish. The key to its reservation is: 1. Election time is best before the Spring Festival (that is, a large number of fish into fish) to choose to retain their broodstock. At this time the choice of broodstock due to reduced food intake, slow activity, tight scales, and not easy to hurt. 2. Select the age of breeding fish sex into