Estimates of Lamprey-Induced Mortality in Whitefish, Coregonus clupeaformis

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Abstract
The seasonal rate of lamprey attack upon lake whitefish in Lake Huron is estimable as the proportion of recently wounded fish in the catch. The nonfatal lamprey attack rate is estimable from the accumulation of healed scars observed on a cohort of marked (tagged) fish sampled throughout the fishing season. The difference between these estimates is an estimate of the fatal lamprey attack coefficient. In northern Lake Huron, lamprey attacks on whitefish are most frequent during August to November. The fatal lamprey attack rate is greatest during late summer when a large proportion of attacks results in the death of the host. Approximately 75% of the lamprey attacks on whitefish are fatal during mid-June to mid-November.Key words: Lake Huron, Petromyzon marinus, lake whitefish, lamprey attack rate

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