Actually, the fish attached to the shark at Amberjack reef is a freeloading shark sucker.

They will latch onto sharks and ride with them, enjoying the sharks' sloppy table manners.

The shark has hundreds of sharp, serrated teeth. It will grab hold of its prey. Then, like a dog mauling its stuffed toy, it will shake its head violently back and forth, letting the teeth tear its meal to shreds.

The result is a sloppy mess of fish particles all around the feeding shark. The shark sucker is adapted to take advantage of this mess by being always in the right place at the right time.