A transmission trial was conducted
to determine if there was a temperature effect on transmission
of walleye dermal sarcoma in young-of-the-year walleyes. Cell-free
filtrates were prepared from tumors collected from adult fish
in the spring. The laboratory-based transmission model was conducted
at 10, 15, and 20C. Fish received an intramuscular injection
in the right epaxial muscle. Grossly visible dermal sarcomas
were observed as early as 8 weeks post-challenge in fish held
at 15C and 20C. Tumors were observed in fish maintained at 10C
only with the aid of histological examination. Prevalence of
walleye dermal sarcoma was greatest in fish challenged at 15C,
followed by that at 20C and 10C.
Reference:
Bowser, P.R., D. Martineau, and G.A. Wooster. 1990. Effects
of water temperature on experimental transmission of dermal sarcoma
in fingerling walleyes (Stizostedionvitreum).
J. Aquat. Animal Health 2:157-161.
