Fish look normal on the outside but certain areas of the fillet look semi-translucent, or yellowish brown with knotted muscle fibers. The tissue has a very dry freezer burn appearance. Other areas of the fillet may be even granular with mineral deposits or opaque.
This condition is only seen in walleye.
The condition is not infectious. Genetic and environmental stressors may play a role in the development of the disease.
Can be found in lakes in Minnesota, Wisconsin, North Dakota and South Dakota.
Due to a lack of concrete scientific knowledge about the spread of the disease, consumption is not recommended.
There are no known methods of preventing this condition.
Dispose of unused portions by burying or with household waste. Fish entrails should never be discarded back into the lake.