Abstract
The reported pathogenicity of the monogenean Gyrodactylus salaris Malmberg, 1957 on Atlantic Salmo salar in Norway has necessitated a national survey of salmonid sites throughout the British Isles to determine which species of the genus Gyrodactylus are resident on these hosts in British waters. Eight morphotypes were identified following examination of the opisthaptoral sclerites at both the light and scanning electron microscope level. Gyrodactylus truttae Glaser, 1974 was found on wild brown trout Salmo trutta in Scotland, England and Wales with an uncharacteristic morphotype, having long, thin marginal hooks. Two morphotypes of Gyrodactylus derjavini Mikailov, 1975 were recorded for the first time from Britain. G. caledoniensis n. sp. from Scottish S. salar is erected, based on differences in the shape and size of the marginal hooks. Two possible new species from English Salvelinus alpinus and a possible new species from Welsh S. salar and Scottish O. mykiss are described.
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