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本文采用在淡水和海水中加入不同浓度的福尔马林,进行鮸鱼刺激隐核虫防治的研究。结果发现,福尔马林质量浓度为221.3mg/L的海水中,鮸鱼12h内无死亡,海水福尔马林对鮸鱼12h,24h,48h,72h,96h时的半致死浓度分别为475.6,413.8,248.1,212.7,200.7mg/L,安全浓度为56.08mg/L;淡水浸泡鮸鱼的半致死时间为126min;淡水处理刺激隐核虫的半致死时间为26min,海水福尔马林中,处理2h和12h的半致死浓度为62.5,23.3mg/L。全池泼洒20～80mg/L福尔马林可防治刺激隐核虫,淡水浸泡30min后泼洒25mg/L福尔马林效果更佳。研究结果表明,海水和淡水福尔马林对刺激隐核虫的致死浓度处于鮸鱼安全范围之内,淡水浸泡30min后泼洒25mg/L福尔马林可有效防治刺激隐核虫。
In this paper, different concentrations of formalin were added into freshwater and seawater to study the prevention and cure of Cryptocaryon irritans. The results showed that there was no death in 12h in marine water with formalin concentration of 221.3mg / L, and the LC50 of formalin to sea bass fish at 12h, 24h, 48h, 72h and 96h were 475.6 , 413.8,248.1,212.7,200.7mg / L, the safe concentration of 56.08mg / L; freshwater immersion tuna fish semi-lethal time was 126min; freshwater treatment to stimulate the Cryptosporidium semi-lethal time was 26min, seawater, formalin treatment The lethal concentrations of 2h and 12h were 62.5,23.3mg / L. Quanchiposa 20 ~ 80mg / L formalin can prevent and cure Cryptocercalis, fresh water soaked 30mg 25mg / L formalin effect better. The results showed that the lethal concentration of seawater and freshwater formalin in stimulating Cryptocercus was within the safe range of anchovy, and spraying 25mg / L formalin after 30min immersion in freshwater could effectively prevent and cure the Cryptocaryon irritans.