在鱼卵孵化过程中,提早脱膜和出现畸形胚胎等情况时有发生,严重影响出苗率。提早脱膜多发生在胚胎发育到尾鳍出现至肌肉效应期阶段,卵膜被溶解,放出胚体,沉入水底。这种失去卵膜保护的胚体绝大多数会死亡。笔者从多年的生产实践中了解到,鱼卵提早脱膜的原因主要有:一是鱼卵的质量差,或是卵子过熟,卵膜薄而无弹性,受外力作用极易破损;二是几个孵化池同时使用孵化循环水,而 Hatching in the process of fish eggs, premature release and abnormal embryos, etc. occur from time to time, seriously affecting the emergence rate. Early stripping occurred in the embryonic development occurs to the caudal fin to the muscular stage, the egg membrane is dissolved, the embryo body was released, sink into the water. The vast majority of embryonic bodies that lose their egg protection will die. The author learned from many years of production practice, the main reasons for the early release of the eggs are: First, the poor quality of eggs, or ova overgrowth, thin and elastic membrane, easily damaged by external forces; Second is Several hatcheries use hatching circulating water at the same time, however