6b514bce_ter_Fish___Minnesota_Sea_Grant__Symptom
[Parasite] BLACK SPOT (Neascus spp., Uvulifer spp.) [Type] fluke [Description] Easy to recognize; caused by larval flukes burrowing under skin. Become adults in fish-eating birds. [Edible] Yes [Recommendation] Clean fish and prepare as usual [Symptom] 
Small round black spots under skin or in flesh
Parasites of Freshwater Fish | Minnesota Sea Grant
Symptom