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在家鱼卵的人工孵化过程中,提早脱膜多发生在胚胎发育的尾鳍出现至肌肉效应期这段时间,卵膜破裂或溶解,失去卵膜保护的胚体沉入水底,并致死亡。发生的主要原因:一是鱼卵质量差,或是卵子过熟,卵膜脆薄而弹性差,极易破损;二是孵化池内壁较粗糙,划破卵膜;三是放卵的密度过大,或是孵化用水水质差,PH值偏高偏低等;四是几个孵化池同时使用孵化循环水,而各个孵化池进卵的时间又先后不一,早入池孵化的鱼卵早脱膜,释放到水体中的卵膜溶解酶随循环水进入后放鱼卵的孵化池,引起后入池孵化的鱼卵提早脱膜。
In the process of artificial hatching eggs, early stripping occurred in the embryonic development of the caudal fin to the muscular effect of this period of time, the rupture or dissolution of the egg membrane, lost egg membrane protection of the embryo body sink to the bottom, and cause death. Occurrence of the main reasons: First, poor quality eggs, or ova overgrowth, egg thin and brittle and flexible, easily damaged; Second, the hatchery wall rough, cut the egg membrane; Third, the density of ovulation Large, or hatch water quality is poor, PH value is low and so on; Fourth, several hatchlings at the same time the use of hatching circulating water, and each hatch pool into the egg time and one after another, Tuomo, released into the water in the egg with lytic enzyme into the circulating water into the hatching pool of fish eggs, causing hatching eggs after hatching premature release.