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ARS Home » Southeast Area » Stuttgart, Arkansas » Harry K. Dupree Stuttgart National Aquaculture Research Cntr » Research » Publications at this Location » Publication #169261

Title: AN UNUSUAL CASE: WALLEYE LESIONS IN THE VISCERAL CAVITY

Author
item Mitchell, Andrew

Submitted to: Annual Eastern Fish Health Workshop
Publication Type: Abstract Only
Publication Acceptance Date: 3/2/2004
Publication Date: 3/22/2004
Citation: Mitchell, A.J. 2004. An unusual case: walleye lesions in the visceral cavity [abstract]. 29th Annual Eastern Fish Health Workshop. p. 12.

Interpretive Summary:

Technical Abstract: An unusual disease condition was found in a 1.8 kg walleye from Merritt Reservoir in northwestern Nebraska. The fish was processed at the Stuttgart diagnostic laboratory in May of 1990, and when the body cavity was opened hard cysts or nodules in the swimbladder and visceral fat were observed. The nodules appeared to be formed around a worm-like mass. The nodules (10±5 mm in diameter) were composed of five to seven layers of tightly packed granules, that were at least partially calcified and the layers were held together by a sticky matrix. The outer coat of the nodule was convoluted with many protuberances. This is a first report of such cysts from fish and they appear to be similar to nodules induced by worms (encysted nematodes) in the intestines of swine and ruminants. Histopathological results were not conclusive but supported results found from the original diagnostic workup.