Theses and Dissertations

Title: The life history and pathology of the eye nematode, Philometra intraoculus sp. n., of bluegill (Lepomis macrochirus)

Name: Wellborn, Jr Thomas L.

Degree: PhD

Chair: E. W. Shell

Resides: FAA library

University: Auburn

Location: Auburn, Alabama

Date: 1970

Pages: 90

Keywords: Eye Nematode,Bluegill.


Philometra intraoculus sp. n. occurs as an adult primarily in the orbit and eye of bluegill. Eight species of fish from three locations (Tupelo National Fish Hatchery, Mississippi: Warm Springs National Fish Hatchery, Georgia: Clark Hill Reservoir, Georgia) were examined, but only three species, bluegill, redear sunfish and largemouth bass, were infested with P. intraoculus. At Tupelo, Warm Springs, and Clark Hill Reservoir, the bluegill examined were found to have an infestation of 76.5 percent, 84.0 percent, and 26.5 percent, respectively. At Tupelo and Warm Springs, P. intraoculus was recovered from the brain of 14.7 percent and 16.0 percent of the bluegill examined, respectively, whereas none was recovered from the brain of bluegill from Clark Hill Reservoir. Adult Moina affinis, Daphnia pulex, D. catawba, Diaptomus sp., and Cypridopsis sp. were exposed to first-stage larvae of P. intraoculus. Only Diaptomus and Cypridopsis became infested and were force fed to uninfested b]uegill. Also bluegill were force fed first-stage larvae. Infestations were established in bluegill that were fed infested Diaptomus and Cypridopsis. Larvae were recovered from bluegill that were fed first-stage larvae. Infestations of P. intraoculus evoke only a mild inflammatory response in the host and apparently cause little damage except when they accidental]y penetrate the brain. The migration of P. intraoculus through the brain results in death of the host.

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