Disclosed is a germicide for aquaculture, comprising:(a) 15-45% by weight of amide compound,(b) 30-65% by weight of inorganic peroxide, and(c) 1.0-45% by weight of buffering agent, wherein (a), (b), and (c) is totally 100% by weight. The germicide dissolves in water to produce peracetic acid having a concentration in a range of 0.0125-0.5 mg/l. The peracetic acid can kill microbes existing on crustaceans and culture pond of which while maintaining high survival rate of the crustaceans.本發明揭示一種水產養殖用的殺菌劑,其包含:(a) 15-45重量%之醯胺化合物;(b) 35-65重量%之無機過氧化物;及(c) 1.0-45重量%之pH緩衝劑,其中該(a)、(b)及(c)三者之總重量計為100重量%。該殺菌劑經溶解於水後使其產生濃度為0.0125-0.5 mg/l的過醋酸,該濃度之過醋酸能殺滅養殖池內甲殼類體內外所挾帶的微生物並同時維持甲殼類之高存活率。
