Lymphocystis disease in Wisconsin fishes

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Abstract
Lymphocystis disease is reported from seven fish species in 48 of Wisconsin's 72 counties (67%). It was previously known from only two fish species in five counties. The record from northern pike, Esox Indus L. is new. Five other host records are new for Wisconsin. A relationship between the disease distribution in new waters and walleye, Stizostedion vitreum (Mitchill), stocking sources is noted. Histologlcal observations from black crappie, Pomoxis nigromaculatus (Lesueur) and walleye are similar to previously published accounts. Events in hyaline capsule degeneration are described for the first time. In Wisconsin, the disease was most commonly observed in the spring, particularly in walleye, but was consistently evident throughout the rest of the year.

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