“oomis: I don’t understand your point. Hashem also says we may eat lettuce, but the the bugs on them. Eat Norwegian Salmon and you’re safe. “
Let me clarify. Bugs on produce go onto the produce themselves. Bugs walk onto the lettuce, and lay eggs, etc. Fish, may ingest these worms as part of their food chain. Do we check poultry and meat flesh for these worms, as well (if so, then of course, it should be checked in fish)? If it is known that the worms are in the fish’s intestines, the intestines should be discarded. But if Hashem gave us fish to eat, the presumably He knew that fish ingest worms and they might be hard, if not impossible to remove from them. Yet, He did not say, eat the fish with fins and scales, but not if they have worms. Anyway, this topic is for discussion by rabbonim, which I am not, and I go by what my poskim tell me is muttar or assur. So far, I am having salmon and blintzes (not mixed together) for dinner tonight, BE”H. And cheesecake.