Vampire Fish

According to the Croc 1 GBC manual, the Vampire Fish is "A mean fish that snaps his jaws at Croc, be careful of his very sharp teeth!"

In GBC

 * These creatures do not chase Croc; rather they act as obstacles, swimming back and forth. Croc will take damage if he touches one.

In Original Game

 * These fish appear a couple times in underwater stages of the original game, as well. They are recognizable by their green bodies and red eyes.