Larger fish like tuna, swordfish, and shark tend to have high amounts of mercury and other heavy metals.

“the bigger the fish the more Mercury halibut is really high in mercury”

“and I didn't love tuna but swordfish definitely has a lot of mercury”

“many of the bigger fishes the Tunas the Swordfish the shark that has very high amounts of mercury and other heavy metals”

“fish has a lot of heavy metals. Oh, salmon is good. No, salmon still has a significant amount of mercury. Tuna has a ton of mercury.”