dnw 🤔curious

Tuna versus Tuna 'Fish'

Why is it, that among the commonly referred to fish here in the US, do we add the secondary qualifier of 'fish' to Tuna? You can't go out and buy a can of Salmon Fish, or Trout Fish, or Halibut Fish. So why Tuna Fish?

And don't try to come back with Catfish or Swordfish or Hagfish. If you drop the 'fish' from those, you're now talking about something else completely different. If you drop the 'fish' from Tuna Fish, you're still taking about the same thing.

Its as if someone was afraid that if 'fish' wasn't added to Tuna, there'd be confusion as to just what was being referred to, as if there were Tuna Cheese or Tuna Paper or Tuna Boilerplates.

Does anyone out there know the answer?