Dermal Sarcoma

Cause of disease:


What does it look like?

Grape cluster like tumor. Walleye dermal sarcoma produces warty growths commonly seen on the fish's skin and fins. Growths are usually gray-white or pinkish in color.


Fish species affected:

This disease is only seen in walleye.

Life cycle:

Infections occur throughout the year but at a higher rate during the walleye's spring spawning season. Walleyes congregate on their spawning grounds and the virus spreads from fish to fish through physical contact.

Where is the disease is found?

Found predominantly in the Upper Midwest and Great Lakes Region. Occurs throughout Minnesota.

Is it safe to eat?

The disease is not known to infect humans. As always, cook fish thoroughly.

How can I prevent the spread?

There are no practical ways to control this disease.

Disposal of unused portions:

Skin of infected walleye should be buried or disposed with household waste. Fish entrails should never be discarded back into the lake.

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