Abstract
One-hundred age-0 walleye Sander vitreus and 100 age-0 yellow perch Perca flavescens collected in September 2015 from Saginaw Bay, Lake Huron, Michigan, U.S.A., were examined for parasites. Five parasite species (Allacanthochasmus sp., Ichthyocotylurus sp., Bothriocephalus cuspidatus, Camallanus oxycephalus, Ergasilus luciopercarum) infected walleye. Ergasilus luciopercarum had the highest prevalence (97%), mean intensity (9.0), and mean abundance (8.7). Ichthyocotylurus sp. and B. cuspidatus each had a prevalence of 73%. Twelve parasite species (Myxobolus neurophilus, Allacanthochasmus sp., Diplostomum sp., Ichthyocotylurus sp., Neascus sp., Crepidostomum sp., B. cuspidatus, Proteocephalus sp., Dichelyne cotylophora, Eustrongylides tubifex, Philometra cylindracea, Ergasilus luciopercarum) occurred in yellow perch. Ichthyocotylurus sp. had the highest prevalence (72%), mean intensity (7.9), and mean abundance (5.7). Proteocephalus sp. had the next highest prevalence (40%). Walleye and yellow perch are new host records for metacercariae of Allacanthochasmus. Saginaw Bay is a new locality record for M. neurophilus in yellow perch and for C. oxycephalus in walleye. This study is the first survey of the parasites of age-0 walleye and age-0 yellow perch in the Great Lakes.
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