Whitefish parasitized with plerocercoids of Triaenophorus crassus are slightly shorter and considerably lighter than non-parasitized fish of the same age. Heavily parasitized tullibee (Leucichthys sps.) grow slightly more slowly than lightly parasitized fish.Whitefish are more affected by the parasites than tullibee, a fact which favours the argument that Leucichthys sps. are the more natural hosts for T. crassus.
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Richard B. Miller (1945) studied this question.