Spike Bass
From the Super Mario Wiki
The Spike Bass is one of the most intimidating enemies in New Super Mario Bros..
Only appearing in two levels, a Spike Bass is a giant fish. Spike Bass are brown, with a pale underbelly. They also have beaming yellow eyes, sharp teeth and spikes all over their bodies. Spike Bass jumps from the water, and tries to attack Mario. The fish can only reach a certain level though, so if Mario is on high grounds, he will have a good chance of being safe. Sometimes Mario has to swim to complete the level, and a Spike Bass will be right there to attack the plumber.
This enemy can be defeated with a fireball, a Koopa Shell, a Starman, and a Mega Mushroom, but returns after a few seconds.
