The Life Cycle of Diphyllobothrium sebago (Ward, 1910)

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Abstract
Starting with a plerocercoid obtained from a landlocked salmon (Salmo salar), the life cycle of Diphyllobothrium sebago (Ward), regarded as conspecific with Spargannm sebago Ward, 1910, has been elucidated experimentally. The parental generation was established in a golden hamster. Egg production began at 7 days and dropped off sharply at 114 days post-infection. The incubation period of the eggs from this worm was from 9 to 12 days, depending upon temperature. After 13 days 52% of 300 Cyclops bicuspidatus thomasi and C.yemalis feeding on the oncospheres were infected, some with almost fully developed procercoids, for an average of 1.8 per host. When these Cyclops were fed to brook trout (Salvellinus fontinalis), infective plerocercoids resulted. At a water temperature of 1 C plerocercoids developed slowly at first, reaching only 1 to 2 mm at the end of 113 days. After an additional 61 days, during which the water temperature had increased to 10 C, 12 to 15 mm long larvae were found. Adult worms developed in hamsters, kittens, and herring gulls. Larval and adult development in the different hosts is discussed.

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