Shark

Sharks is an enemy found in Turtle Zone in Super Mario Land 2: 6 Golden Coins. Normally, he swims slowly, but when Mario gets close to him, he starts swimming faster, charging at him. Since he is an underwater enemy, Mario can not stomp on him, and unlike many other enemies Fireballs do not affect him. The only way to defeat him is with a Star, or, in rare cases, a Koopa Shell from the surface. He wears boxing gloves, but he doesn't seem to use them against Mario.

In volume 9 of the Super Mario-Kun, Mario, Luigi, and Yoshi encounter a Shark during their boat trip. The Shark attacks them, but Mario throws Yoshi to the Sharkto defeat it, although Yoshi gets injured.