Fish are neither amphibians nor reptiles. Fish belong to a separate group of animals known as vertebrates, specifically classified under the category of aquatic vertebrates. Amphibians, such as frogs and salamanders, are a distinct class of vertebrates that typically live both in water and on land during different stages of their life cycle. Reptiles, like snakes and turtles, are another class of vertebrates that are primarily land-dwelling and have scales or scutes covering their bodies. Fish, on the other hand, are adapted to live entirely in water and have gills for breathing underwater. Therefore, fish are a unique group separate from both amphibians and reptiles.