If it looked like white warts it's a skin disease common to perch and walleye (the name escapes me right now), does not infect the meat, and the fish usually recover fine on their own according to the research I've read. I've eaten hundreds of perch with those growths.
And yes, legally you have to release it in that situation.
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“Nothing is more persistent than a liberal with a dumb idea” - Ebrand
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