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Fishing WisconsinLymphosarcoma in musky and northern pike

Believed to be a viral disease that may be transmitted by close physical contact, such as spawning. Transmission of the virus may be possible by physical contact during spawning and other close contacts.

Cauliflower like tumor on the skin. Tumors range from pea size to several inches, depending on water temperature. Tumors are more prominent at cooler water temperatures (fall and winter) and sometimes regress in northern pike. Tumor may spread to inner organs.

Lymphosarcoma in Muskellunge in Wisconsin

Lymphosarcoma in a northern pike

For more information, please see the Lymphosarcoma fact sheet [PDF]

Last revised: Wednesday June 19 2019