Jammyfish

Jammyfish (originally referred to as jellyfish in a general sense by Prima Games) are underwater jellyfish enemies in the Super Mario Galaxy games. In the first Super Mario Galaxy, they are found in underground lakes in the Bigmouth Galaxy and Deep Dark Galaxy. Schools made up of four Jammyfish swim in vertical rings. Isolated Jammyfish passively suspend themselves in water and pulsate their bodies. Direct contact depletes one bar from Mario's (or Luigi's) Life Meter. In Super Mario Galaxy 2, they appear in Cosmic Cove Galaxy. They do not form schools in this game, but individual Jammyfish behave similarly by swimming in rings, or back and forth. They can be defeated with either a spin or a Koopa Shell and give a coin when defeated. They do not actively pursue Mario. Giant versions called Jam-o'-Wars also appear in these games and require two strikes to defeat.