Japanese fighting fish are called "fish" because they are, in fact,
fish.
The term "fish" is a broad category that encompasses a vast array of aquatic animals. Japanese fighting fish, scientifically known as *Betta splendens*, are part of this group.
While they are known for their aggressive nature and beautiful, flowing fins, they are still members of the animal kingdom classified as fish due to their:
* Aquatic nature: They live in water and breathe using gills.
* Fins and scales: They possess fins for movement and scales for protection.
* Ectothermic nature: They are cold-blooded, meaning they rely on their environment to regulate their body temperature.
So, the simple answer is that Japanese fighting fish are called fish because they are a type of fish, just like any other species of fish!