Viruses Associated with Lymphocystis Disease and Dermal Sarcoma of Walleye (Stizostedion vitreum vitreum)

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Abstract
Gross examination of a spawning run of walleye (S. vitreum vitreum) revealed many fish with tumors on the body and fins that appeared to be characteristic of lymphocystis disease. Light microscopic and EM examination revealed the presence of 2 distinct tumor types. One was characteristic of lymphocystis, consisting of typical enlarged nonneoplastic cells surrounded by hyaline layers and containing many 260 nm diameter lymphocystis virus particles in the cytoplasm. The other tumor, referred to as a dermal sarcoma, consisted of a solid mass of normal-sized cells and contained in the cytoplasm large numbers of 135 nm diameter virus particles referred to as walleye dermal sarcoma (WDS) virus. The WDS virus was similar in appearance to the leukoviruses and, with its outer layer sectioned tangentially, exhibited symmetry like a member of a leukovirus group designated by Fenner as subgenus C.

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