Actually, that looks more like the offspring of the fish and chainsaw's drunken hookup.
That fish is a sawfish (duh) and its shnozzle is actually called a rostrum, and it can grow as long as 5 feet and have as many as 37 blades running up both sides. And each of those teeth can be up to 2 inches long.
"The only thing I could find to kill it was another sawfish."
And, as if the weapon itself wasn't horrifying enough, the barbed club is also covered in motion- and electro-sensitive pores that are designed to help the monster detect the heartbeats of other fish hiding on the ocean floor.
These are all things you should remember should you ever find your nearly dead body at the bottom of the ocean. That and the fact that cyanide pills slip nicely into any wetsuit.
Careful back there, dude. Its ass is made of grenades.