Abstract
ABSTRACT Intra-annual variations in prevalence, mean intensities, and distribution of Salmincola californiensis on juvenile sockeye salmon (Oncorhynchus nerka) from Lake Washington were examined. Seasonal variations in parasite prevalence seemed to be related to the seasonal variations in fish body size. No copepod parasites were observed on juvenile salmon < 75 mm. More than 80% of the parasites were observed in the branchial cavities of the fish; the rest occurred on the body surface or bases of fins. There was no difference in the length-weight relationship of infested and uninfested fish.
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