Studies on life cycles of aquatic parasites, in particular, host-specificities of their infective stages

本文阐明了引起东方鲀“卡氏症”的东方鲀的生活史、生长和繁殖。在杯形类中，获得了以下新结果：（1）无节幼体后阶段的数目与其它桡足类一样，为6个;（2）某些种类在成虫时具有转换寄主的生活史;（3）吸盘状新月体发育起源于额板的角质层膜。河豚在玻璃河豚上全年发生和繁殖。三种吸虫分别以大型水母、食草鱼类和霞水母为第二、终末和寄生宿主。组织食性使徒纤毛虫Vampyrophrya pelagicametomorphoses从tomite到phront，在这个过程中，囊壁和柄和食物液泡膜的前体形成。

The life cycle, growth and reproduction of Caligus fugu(=Pseudocaligus fugu), which causes “caligosis” in tiger puffer, are clarified. In caligiforms the following results were newly obtained:(1) the number of post-naupliar stages is six as in other copepods;(2) some species have a life cycle to switch hosts in adults;(3) the suck-like lunule developmentally originates from the cuticle membrane of frontal plates.The monogenean Udonella fugu hyperparasitic on C. fugu on glass puffer occurred and reproduced throughout a year. Three species of trematodes utilize large-sized medusae, medusivorous fish and Cyanea nozakii as the second, final and paratenic hosts, respectively. The histophagous apostome ciliate Vampyrophrya pelagicametamorphoses from tomite to phront, during which cyst wall and stalk and precursors of food vacuole membranes are formed.