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

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<strong>Fish</strong> Families—Parasite Species-Richness, Parasite Analyses<br />

The values for parasite species-richness and number <strong>of</strong> fish species examined (in paren<strong>the</strong>ses),<br />

regardless <strong>of</strong> parasite life-stage, for each <strong>of</strong> <strong>the</strong> five major fish families were Centrarchidae (13,<br />

3), Catostomidae (15, 2), Cyprinidae (12, 4), Percidae (33, 4), and Salmonidae (27, 11). The<br />

correlation coefficient between parasite species-richness and number <strong>of</strong> fish species examined in<br />

each <strong>of</strong> <strong>the</strong> above five families was nonsignificant (rs = 0.307).<br />

Parasite species or a specific genus found only in centrarchids were adult digenetic trematodes<br />

(Caecinicola parvulus, Cryptogonimus chili), leeches (Piscicolaria sp.), and copepods (Ach<strong>the</strong>res<br />

ambloplitis, Ergasilus centrarchidarum). <strong>Parasites</strong> found only in cyprinids were protozoans<br />

(Myxobolus bartai, Myxobolus xiaoi, M. burti, Thelohanellus notatus, Zschokkella sp.,<br />

Chloromyxum sp., Sphaerospora sp.) and adult digenetic trematodes (Centrovarium lobotes).<br />

<strong>Parasites</strong> found only in catostomids were adult digenetic trematodes (Lissorchis attenuatus), adult<br />

cestodes (Glaridacris catostomi), adult nematodes (Capillaria catostomi), and adult<br />

acanthocephalans (Neoechinorhynchus crassus, N. cylindratus, Octospinifer macilentus).<br />

<strong>Parasites</strong> found only in percids were protozoans (Henneguya doori, Myxobolus neurophilus, M.<br />

scleroperca), adult digenetic trematodes (Bunodera sacculata, Crepidostomum cooperi,<br />

Phyllodistomum superbum), larval digenetic trematodes (Apophallus sp., Clinostomum<br />

complanatum), monogeneans (Urocleidus adspectus), adult nematodes (Camallanus oxycephalus,<br />

Philometra cylindracea, Rhabdochona ovifilamenta), and larval/immature nematodes<br />

(Contracaecum sp., Dichelyne cotylophora, Eustrongylides tubifex, Raphidascaris acus).<br />

<strong>Parasites</strong> found only in salmonids were protozoans (Capriniana sp.), adult cestodes (Eubothrium<br />

crassum, E. salvelini, Proteocephalus exiguus), larval cestodes (Diphyllobothrium oblongatum,<br />

Diphyllobothrium sp.), adult nematodes (Capillaria salvelini, Cystidicola farionis, Cystidicola<br />

sp.), immature nematodes (Haplonema hamulatum), leeches (Piscicola punctata, Placobdella<br />

parasitica), and copepods (Ach<strong>the</strong>res pimelodi, Ergasilus nerkae, Salmincola extensus, S.<br />

extumescens).<br />

The number and percentage <strong>of</strong> parasite species and distinct genera in each <strong>of</strong> <strong>the</strong> major parasite<br />

groups reported for each <strong>of</strong> <strong>the</strong> five parasitized fish families <strong>from</strong> Lake Michigan are in Table 6.<br />

The parasite taxa most common in each fish family were protozoans, specifically <strong>the</strong> myxozoans,<br />

in Cyprinidae, acanthocephalans in Catostomidae, digenetic trematodes and copepods in<br />

Centrarchidae, digenetic trematodes and nematodes in Percidae, and copepods, cestodes, and<br />

nematodes in Salmonidae.<br />

All helminth species reported <strong>from</strong> <strong>the</strong> cyprinids (5 species) and catostomids (13 species) are<br />

autogenic species. The numbers and percentages <strong>of</strong> autogenic and allogenic helminth species for<br />

<strong>the</strong> remaining families were Centrarchidae (10 species, 91%; 1 species, 9%), Percidae (21<br />

species, 81%; 5 species, 19%), and Salmonidae (12 species, 92%; 1 species, 8%).<br />

14

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