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我县20个鱼种场站,近年来都普遍出现草鱼、鲢鱼、鳙鱼进行人工繁殖时,半产和难产的亲鱼增多,催产率下降,产后亲鱼死亡严重。为什么会出现这些现象呢?最主要的原因是各鱼种站的草、鲢、鳙亲鱼没有经过严格的选育和提纯复壮,亲鱼培育技术和人工繁殖技术未过关,概括起来有以下几点: 一、雌鱼不够成熟或卵巢开始退化。由于亲鱼的饲养管理不好,有些雌鱼到了催产期,鱼卵还没有成熟。因此在亲鱼
In 20 counties in our county, in recent years, grass carp, silver carp and bighead carp have been widely used for artificial breeding. The number of brood fish in half-term and dystocia increased, the rate of oxytocin decreased, and the death of brood fish after delivery was serious. Why do these phenomena occur? The most important reason is that grass, silver carp and broodstock of various fish species stations have not undergone strict breeding and rejuvenation. The broodstock breeding technology and artificial breeding technology have not been cleared yet. In summary, the following are the points: First, the female is not mature enough or the ovary begins to degenerate. Due to poor feeding and management of broodstock, some females have reached the stage of oxytocin and their eggs are not mature yet. So in the broodstock