Fish that mimic fish

There are many fish that mimic other fish for protection.

Many types of surgeon fish or tangs as a juvenile mimic different types of large angelfish for protection.

There are also a few file fish that mimic the Toby puffer since the puffer is poisonous.

Certain types of Cuttle fish mimic the female cuttle fish when they are juveniles to gain the ability to live in a larger male's territory with out being killed or run off.