Gulpfish

A big, neutral fish with a perpetually open mouth, drifting lazily through warm ocean biomes and bringing quirky charm to underwater exploration.
Frequently surrounded by schools of smaller fish that feed on the leftovers it stirs up.
The Gulpfish loves to eat Crabs that waddle on the ocean floor. They come to the crab and then suck him in its big mouth.
The Gulpfish occasionally burps up random sea items like kelp, coral fragments, or even treasure from ancient shipwrecks.