What is a tuna fish considered to be?

A tuna fish is considered to be a fish, specifically a member of the Scombridae family, which also includes mackerel and bonito.

Here's a breakdown:

* Fish: A general term for aquatic animals that have gills, fins, and scales.

* Scombridae family: A group of fish characterized by their streamlined bodies, powerful muscles, and ability to swim fast.

* Tuna: A specific type of fish within the Scombridae family, known for their large size, high fat content, and migratory habits.

So, a tuna fish is a fish that belongs to the Scombridae family.