I've always thought that many species have worms. It's natural as far as I know. Squeeze lemon over a previously frozen swordfish steak and they will rise out of the meat. Part of the prep for me. (Freaks out my other half though...) Can't say if this is something that is "new" or on the increase though. But it is why I don't eat sushi, and I am often asked why. Sushi for me is for when I am in a liferaft and out of necessity.
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