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通过对日本棘隙吸虫尾蚴生态学观察,结果表明尾蚴的发育、逸放、活动,感染鱼类宿主等均与温度、光度有密切关系。在水温27～32℃时,螺体内子雷蚴可不断增殖尾蚴,并有大量的尾蚴逸出;低于24℃,增殖能力减弱,尾蚴逸出明显减少;14℃时不再有尾蚴逸出。小型鱼种的日本棘隙吸虫囊蚴感染率和感染度之所以比大型鱼种者高,在于尾蚴具有明显的趋光性和好在水体浅层活动,与小型鱼种接触的机会较多之故。纹沼螺内尾蚴自然感染率以采于7～10月者为高,调查第一中间宿主应选择适宜的季节进行。
Through the ecological observation of cercariae crassa, the results showed that cercariae development, easing, activity, infected fish host and so on are closely related with temperature and luminosity. At the water temperature of 27 ~ 32 ℃, spirochaetes Erythrocytes can continue to proliferate cercariae, and a large number of cercariae to escape; below 24 ℃, proliferation decreased, cercariae significantly reduced escape; 14 ℃ no more cercariae escape . Small fish species of Japanese echinococcus metacerictus infection and the reason why the infection rate is higher than the large species, cercariae has obvious phototropism and good shallow water activities, and small fish contact opportunities are more. The natural infection rate of C. malacodatus internal cercariae collected in July to October were high, the first intermediate host survey should choose the appropriate season.