The only recommendations to limit fish that I have seen are due to mercury exposure risks:
https://www.fda.gov/food/consumers/advice-about-eating-fish
Coal burning and incidental industrial releases drastically increased the amount of mercury in surface waters over the past century. The released mercury gets transformed by bacteria into organomercury compounds which are lipophilic and concentrate up the food chain, meaning that predator fish like tuna and swordfish can contain orders of magnitude more mercury than the water they live in.
There are plenty of fish with much lower mercury levels (like salmon, trout, and sardines):
https://www.fda.gov/food/environmental-contaminants-food/mer...
You can eat all the salmon you want without worrying about mercury, and I haven't seen government advice to the contrary.