Parasites of Fish from the Great Lakes - Great Lakes Fishery ...

Protozoans
Five species of ciliates (Ichthyophthirius multifiliis, Trichodina urinaria, Trichodina sp.,
Capriniana piscium, Scyphidia micropteri) representing four families were found in Lake Ontario
fish. Some species occurred on the gills; Ichthyophthirius multifiliis also infected the fins and
body surface, and Trichodina urinaria and Trichodina sp. were found in the ureters. Unidentified
species of Trichodina occurred on seven fish species.
Fifteen species of myxozoans in two families were documented. Nine of these species are in the
genus Myxobolus. All species are host-specific occurring in non-intestinal sites in one fish species
or in one family. Three species of microsporans, Glugea cepedianae, Glugea hertwigi, Glugea
pimephales, have been reported with each species being host-specific to Dorosoma cepedianum,
Osmerus mordax, and Pimephales spp., respectively.
Digenetic Trematodes
Thirty-four species of adult digenetic trematodes in 14 families were reported. Ten species were
in the Allocreadiidae, with the genus Crepidostomum (5 species) being most common. Five
species of Phyllodistomum (Gorgoderidae) have been reported. Azygia angusticauda infected six
fish species. Several species are host-specific to one fish species or one family. Most species
occurred in the intestine or pyloric ceca, except for Acetodextra amiuri (swim bladder, ovaries),
Phyllodistomum spp. (ureters, urinary bladder), Plagioporus sinitsini (also gall bladder),
Sanguinicola occidentalis (blood), and Prototransversotrema sp. (under scales).
Fifteen larval digenetic trematode species representing six families occurred in various nonintestinal
sites. The Diplostomidae was represented by eight species. The most prevalent were
Diplostomum spathaceum in 39 fish species, Ichthyocotylurus sp. in 17 fish species, and
Clinostomum complanatum and Posthodiplostomum minimum each in 7 fish species. Bucephalus
sp. was the only immature trematode found in the intestine.
Monogeneans
Eighty species of monogeneans representing 10 families have been documented on Lake Ontario
fish. The best represented families were the Ancyrocephalidae (43 species), the Gyrodactylidae
(14 species), and the Dactylogyridae (11 species). The genus Gyrodactylus was represented by 14
species, Onchocleidus by 10 species, and Dactylogyrus by 10 species. Gyrodactylus macrochiri
was found on four species of centrarchids. Most species are host-specific to one fish species or
one family. The ancyrocephalids and dactylogyrids were primarily found on the gills and the
gyrodactylids on the fins. Ligictaluridus monticelli occurred in the nares; Lyrodiscus rupestris
occurred in the nares, gills, and fins; and Acolpenteron catostomi occurred in the ureters.
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