Epitheliocystis in lake trout Salvelinus namaycush (Walbaum) is associated with a β‐proteobacteria

Lake trout Salvelinus namaycush (Walbaum) raised for stocking experienced yearly (2011–13) winter epizootics of epitheliocystis. Affected fish were dispersed on the bottom of the tank, had decreased feed and fright response, and mortality often reached 40%. Peak mortality occurred within 3 weeks of...

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Veröffentlicht in:Journal of fish diseases 2016-03, Vol.39 (3), p.353-366
Hauptverfasser: Contador, E, Methner, P, Ryerse, I, Huber, P, Lillie, B N, Frasca, S, Jr, Lumsden, J S
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Sprache:eng
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Zusammenfassung:Lake trout Salvelinus namaycush (Walbaum) raised for stocking experienced yearly (2011–13) winter epizootics of epitheliocystis. Affected fish were dispersed on the bottom of the tank, had decreased feed and fright response, and mortality often reached 40%. Peak mortality occurred within 3 weeks of the appearance of clinical signs, and outbreaks typically lasted 6 weeks. Affected fish had no gross lesions but histologically had branchial epithelial necrosis and lamellar hyperplasia, with small to large numbers of scattered epithelial cells containing 10‐ to 20‐μm inclusions. A longitudinal study was undertaken of one annual outbreak, and lamellar hyperplasia was most closely associated with mortality. The number of inclusions was statistically greater (P 
ISSN:0140-7775
1365-2761
DOI:10.1111/jfd.12369