Degree Name

Master of Science (MS)

Semester of Degree Completion

1975

Thesis Director

Bill T. Ridgeway

Abstract

Ninety channel catfish (Ictalurus punctatus) were trapped during September 1973 through April 1974 at three hatcheries located at Worden, Centralia, and Kinmundy, Illinois. All were examined for parasites and 87 were parasitized. The trematodes Azygia angusticauda and Neascus sp. were found in the gastrointestinal system and Cleidodiscus floridanus and Dactylogyrus sp. were attached to the gills. Five cestode genera, including Bothriocephalus sp., Corallobothrium giganteum, Eubothrium sp., Haplobothrium sp., and Proteocephalus ambloplitis were present. Rhabdochona sp. was the only nematode found. Protozoans; Costia sp., Myxobolus sp., Scyphidia macropodia and Trichodina discoidea and one kind of glochidium were observed. Three nonparasitic diseases were noted, Anemia, Dietary gill disease and Lipoid degeneration of the liver, all from fish collected at one location, and one form of bacterial infection, Chondrococcus columnaris, from fish at another site. The incidence of parasitism, developmental stage and organ parasitized are discussed. Effects of age, weight, sex and seasonal distribution on the extent of parasitism are also compared.

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