6b514bce_ter_Fish___Minnesota_Sea_Grant__Symptom
[Parasite] COLUMNARIS DISEASE (Flexibacter columnaris) [Type] bacteria [Description] Infects catfish, trout, and possibly other species. [Edible] Yes [Recommendation] Clean fish and prepare as usual [Symptom] 
Grey-white to yellowish slime on skin, gills or fins; also frayed fins
Parasites of Freshwater Fish | Minnesota Sea Grant
Symptom