Clownfish have more rounded caudal fins. These fins normally make it a naturally slow, less effective swimmer. However, because they are more rounded, it allows a clownfish to make quick darting movements.

A very important adaptation of the clownfish is their ability to resist the sting of anemones. Their bodies produce mucus that resists these stings. Because of this adaptation, the slow fish is given a place to live and hide from predators.

Another adaptation is their ability to detect the correct anemone by smell. This means that the fish will always remember which anemone they originated from and can return to it.

Clownfish also have the ability to bleach itself in color at night and to hide within the anemone tentacles. This provides the fish with protection from potential night predators.