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This is pretty common and cannot always be seen from outside. What do you do when you start cleaning them and find out?
For sunnies its almost never that you cant visually notice them somehow. If you caught one with some black spots its likely that most of the panfish in the area are infected. Its not hard to tell, catching several fish and examining them will give you an better idea. Plus I rarely eat Gills, yes I think its they taste great but I just dont eat them often. In part if see any traces of neascus on sunnies I wont eat them.
You will find some fish are more heavily infected in others, especially the ones caught shallow. I dont eat bass. For crappies or walleyes that are usually infected with black spots the infection or traces are generally light where the meat and fins can be trimmed and salvaged to be eaten.
I dont keep fish often, and the fish I choose to keep im generally very selective of from certain bodies of water only.