This entire thread is /c/badlinguistics.

I just call it canned tuna. Or tuna from a can.

We know tuna is a fish is a wild statement when talking about americans

Tuna was not always popular and when people didn't know what it was it helped people know what they are buying. The US also having a large portion of bilingual people with a Spanish base, this helps it not get confused with cactus fruit (apparently tuna in Spanish)

"吞拿魚"

[transliteration of "tuna"] + ["fish"]

The American English language is wierd... Two to four instances of one word to mean different things or to put emphasis on plurals or not... Plus certain connotations depending on who you're talking to. So trying to go and learn different languages, especially when they only have one instance of something, I have found.

Listen, y’all eat something called spotted dick - you can let us have tuna fish with no damn grief thank you

I would love to tune my bass

I prefer to stick to soylent human when I’m hungry

I love bull beef burgers

Tuna means prickly pear cactus fruit in Spanish, I've heard it called that pretty often in Texas

I’ve noticed the same thing with Koi. But not with trout or bass or most other fish.

It makes sense for swordfish, because just sword is ambiguous.

Language is weird.

Of note, the homophonic word, Tuna means the large fish with lots of mercury in it in English, and means the fruit of the prickly pear cactus in Spanish. I've made honey wine (mead or in this case melomel) with tuna, the fruit, and it's amusing to hear people's reaction to "tuna melomel".

“Hand me that can of tuna please, I want to make a tuna fish sandwich. “

These words have come out of my mouth.

Yes they’re wrong. But something about the cadence.

Americans do love redundancies. e.g Just barely, only just, just a bit, true facts, free gift, end result, advance warning etc.