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The black hard parasites that I sometimes see in yellow perch are some type of snail larva. They are spread by birds and any fish with those larva should not be left on the ice because any birds that eat those fish will spread them through their feces. Those fish should be released alive or disposed of where no birds will eat them. They are safe to eat after cooking but not very appetizing. Any white worms are also harmless when cooked and are very common in many fish. I remove any that I find and don't worry about those that I miss.
not to over state, but I've found the black'specks' are in the skin only, not the meat, so they're not an issue; nor are they indicative of the white ones,
I have seen the black specks in the skin that you mention. They don't seem to be in the meat. Other yellow perch I have caught had hard black nuggets in the meat. Those are the snail larva that I mentioned earlier. They won't cause harm after cooking but little crunchies in the meat does not appeal to me.
Other yellow perch I have caught had hard black nuggets in the meat. Those are the snail larva that I mentioned earlier. . . .