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The dynamics of infection of diphyllobothrium dendriticum and diphyllobothrium ditremum in the char salvelinus alpinus in sweden

The dynamics of infection of diphyllobothrium dendriticum and diphyllobothrium ditremum in the char salvelinus alpinus in sweden

Journal of Fish Biology 13(1): 51-72

A total of 654 char, S. alpinus, from Lake Bjellojaure, Sweden, were examined for plerocercoids of D. dendriticum (Nitzsch, 1824) and D. ditremum (Creplin, 1825) during Sept. 1969-Dec. 1974. Plankton samples showed that the dominating copepod species in the lake were Eudiaptomus graciloides (Lilljeborg), Cyclops scutifer Sars and Heterocope appendiculata Sars. E. graciloides passed the winter as adults and C. scutifer as copepodids while H. appendiculata was restricted to a short period in the summer. Copepods occurred in the stomachs in Sept.-Oct. and to a certain extent in April-May, but only cyclopids and Heterocope sp. were found. C. scutifer may be the main 1st intermediate host of D. dendriticum and D. ditremum. The potential final hosts were the common gull, Larus canus L., for D. dendriticum and the black-throated diver, Gavia arctica (L.), for D. ditremum. One common gull was experimentally successfully infected with plerocercoids of D. dendriticum. The parasites showed no seasonal cycle in incidence of infection.

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Accession: 006633579

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