A SURVEY of the parasites of the trout, char, stickleback, minnow and eel in Llyn Padarn was begun in April 1963. The trout Salmo trutta L. and the char Salvelinus alpinus perisii (Günther) were heavily infected by the plerocercoids of Diphyllobothrium ditremum (Creplin, 1825) and Diphyllobothrium dendriticum (Nitzsch, 1824) which were found encapsuled in the viscera and body wall. The parasite survey was continued in 1964 when a marked fall in the occurrence of Diphyllobothrium plerocercoids in the trout was noted. Observations made in 1965 showed a further fall in the numbers of the plerocercoids in the trout. The numbers of plerocercoids present in the char remained more or less constant throughout the period of investigation (see Table 1).
Fraser, P. G., J. Helminthol., 34, 59 (1960).
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POWELL, A., CHUBB, J. A Decline in the Occurrence of Diphyllobothrium Plerocercoids in the Trout Salmotrutta L. of Llyn Padarn, Caernarvonshire. Nature 211, 439 (1966). https://doi.org/10.1038/211439a0
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