Aspects of the Biology of Triaenophorus nodulosus in Yellow Perch, Perca flavescens, in Heming Lake, Manitoba

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Abstract
The yellow perch, Perca flavescens, in Heming Lake, Manitoba, serves as the major second intermediate host of the pseudophyllidean cestode Triaenophorus nodulosus. A description of the cyst, plerocercoid, and invasive stages of the parasite is given. Changes in annual incidence of the parasite are recorded from an examination of 22,696 perch captured between 1954 and 1967. The infection level of T. nodulosus in perch declined when the average size of northern pike, Esox lucius, was reduced through intensive fishing. The incidence of infection in perch is a function of size — small perch have a high incidence of infection, which gradually decreases with increasing size of perch. Particular attention is given to the occurrence of T. nodulosus in newly hatched perch; the parasites can serve as indicators of future infection levels in perch and pike. The dynamics of Triaenophorus infection is discussed.

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