Here's the thing. You said a "salmon is a tuna."
Is it in the same family? Yes. No one's arguing that.
As someone who is a scientist who studies fish, I am telling you, specifically, in science, no one calls salmon tuna. If you want to be "specific" like you said, then you shouldn't either. They're not the same thing.
If you're saying "fish family" you're referring to the paraphyletic taxonomic grouping of the Classes Agnatha, Chondrichthyes, Chondrichthyes, Acanthodii , and Osteichthyes, which include things from sharks and rays to tetrapods, which are not fish.
So your reasoning for calling salmon "tuna" is because random people both call them fish?" Let's get Agnathans and conadonts in there, then, too.
Also, calling someone a human or an ape? It's not one or the other, that's not how taxonomy works. They're both. A salmon is a salmon and a member of the fish family. But that's not what you said. You said a salmon is a tuna, which is not true unless you're okay with calling all members of the fish family tuna, which means you'd call sharks, stingrays, and other fish tuna, too. Which you said you don't.
It's okay to just admit you're wrong, you know?
