6b514bce_ter_Fish___Minnesota_Sea_Grant__Symptom
[Parasite] LYMPHOSARCOMA [Type] virus [Description] Infects muskies and northern pike. More prominent in cooler water (fall, winter). Usually fatal in muskellunge. [Edible] No; lack of scientific understanding [Recommendation] Dispose of fish or entrails in household waste or bury. Never discard into a waterbody [Symptom] 
Cauliflower-like reddish tumor; small to several inches; may spread to internal organs
Parasites of Freshwater Fish | Minnesota Sea Grant
Symptom