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>Additionally, I've never seen worms in bottom-feeding fish like catfish and carp.

no just the heavy metals you can see...

Everything in moderation! With the big predators you get mercury, with the bottom-feeders you get persistent lipophilic compounds like PCBs and PFAS.

I could just fish for perch, but what's the fun in that?

(I'm mostly kidding, I love fishing for perch too.)