Another random Parashi creature.
Plungerfish swim ridiculously slowly, look more or less like a lump, and taste awful. They have a suction cup on their back; smaller plungerfish will stick onto swimmers, big ones may stick onto ships and weigh them down. In spite of that they're generally pretty harmless. They are incredibly stupid and only live long because they grow to be so huge.

Oh and Ryuu sucks at swimming.