虹鳟,原产美国加利福尼亚州,属冷水性鱼类,性娇易发病,我国于1959年引进后,常见病有细菌性肠炎、小瓜虫、车轮虫、三代虫、斜管虫及肝脂肪病变等,且主要发生在鱼种阶段,其中,小瓜虫病病情发展快、死亡率大,是虹鳟鱼死亡主要病因之一。我区泾县水产养殖场1990年5月从浙江建德鳟鱼场引进虹 Rainbow trout, native to the United States of California, is a cold-water fish, sexual Jiao easily disease, the introduction of our country in 1959, the common diseases are bacterial enteritis, Eupolyphaga, car rotifers, three generations of worms, beetles and hepatic steatosis Etc., and mainly occurs in the stage of fingerling. Among them, the incidence of small melon and worm disease develops rapidly and the mortality rate is large, which is one of the major causes of rainbow trout death. My district Jing County aquaculture farm in May 1990 from Zhejiang Jiande trout field introduction of rainbow