Flying Fish

Flying Fish are minor, tiny ghosts that only appear in the Courtyard and Pipe Room in Luigi's Mansion. As the name suggests, the purple Flying Fish will pop up in groups and try to hit Luigi, causing five HP of damage for each hit. Like mice, they have no HP (as opposed to 0 HP like Ceiling Surprise or Purple Bomber) and can be sucked up easily by the Poltergust 3000. The Flying Fish found in the Pipe Room are identical, except they are green and considerably faster than those found in the Courtyard.

Similar yellow ghosts appear in the Observatory, but they're yellow and cannot be sucked up. They can, however, be aimed and fired at the moon to create a star road to Mario's Star.