Is a dolphin fish an amphibian or mammal explain?

A dolphin fish is neither an amphibian nor a mammal. It's a fish, specifically a mahi-mahi.

Here's why:

* Amphibians live part of their lives in water and part on land, and they breathe through their skin and lungs. Dolphins are fully aquatic and breathe through lungs.

* Mammals give birth to live young, have fur or hair, and nurse their young with milk. While dolphins are mammals, the "dolphin fish" is not.

* Fish are aquatic animals with gills for breathing and fins for movement. Mahi-mahi are a type of fish.

So, the confusion comes from the common name "dolphin fish" being similar to "dolphin" the mammal. However, they are completely different creatures.