Seasonal dynamics and spatial distribution of Cleidodiscus stentor Mueller 1937 and Ergasilus centrarchidarum Wright 1882, gill parasites of Ambloplites rupestris (Raf.)

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Abstract
Seasonal dynamics and spatial distribution were determined for Cleidodiscus stentor Mueller 1937 and Ergasilus centrarchidarum Wright 1822, gill parasites of Ambloplites rupestris (Raf.).Twenty-five specimens of A. rupestris from eutrophic (West Lake) and 25 specimens from oligotrophic (Glenora) habitats were examined monthly between November 1971 and October 1972.The data were analysed using a two-factor ANOVA and Duncan's multiple range test.High abundance levels of C. stentor and E. centrarchidarum were recorded in the two localities throughout the sampling period.Cleidodiscus stentor, the dominant parasite of A. rupestris in West Lake, reached the peak during March 1972 in West Lake and during April 1972 in Glenora. Ergasilus centrarchidarum, the dominant parasite of A. rupestris in Glenora, reached the peak during August 1972 in both localities.The anterior side of hemibranchs, their medial sections, and gill arch two were preferred sites of infection (P < 0.001) for C. stentor.Ergasilus centrarchidarum exhibited clear preference (P < 0.001) for anterior sides of hemibranchs and their dorsal and ventral sections, while its distribution over the four gill arches was fairly even.

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