Tuna aren't a single species, most of them are not endangered. The one you would usually use in sandwiches or salads for example is the albacore or skipjack tun

Tuna aren't a single species, most of them are not endangered. The one you would usually use in sandwiches or salads for example is the albacore or skipjack tuna which is not endangered. Bluefin is critically endangered. (Edit: Saw that albacore is now "near threatened")