2. They belong to different categories, mullet is a fish in the mullet family of the order Mulletiformes, and pike is a fish in the family Lingidae of the order Perciformes.
3. In addition to category, they are actually different in many ways.
4. Their heads are different, with the mullet having a flat head and the pike having a more pointed head.
5. Their backs are different in color, with the mullet's being darker and the barracuda's being lighter.
6. Also, the mullet lives in both fresh and salt water, while the barracuda lives in sea water.