Abstract
Cystidicola stigmatura (Leidy) (=C. cristivomeri White) (see Black, 1983a, Can. J. Fish. Aquat. Sci. 40: 643-647) is a spiruroid nematode which is restricted to North America and matures in lake trout (Salvelinus namaycush) and Arctic char (S. alpinus) (Black, 1983b, Can. J. Fish. Aquat. Sci. 40: 1244-1253). Intensity of infection frequently exceeds 100 worms per fish and parasites can live for many years (Black and Lankester, 1981, Can. J. Zool. 59: 498-509). There are no seasonal trends in prevalence, intensity or maturation of the nematode (Black and Lankester, 1981, loc. cit.). Heavily infected lake trout (>2,000 worms) have been reported with raised ulcers in the swimbladder (Lankester and Smith, 1980, Can. J. Zool. 58: 1298-1305). Swimbladder lesions were found in less heavily infected hosts from across the parasite's distributional range but not in uninfected fishes. This study examines the relationship between intensity of infection and the number of swimbladder lesions.
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