

Sea Cucumber & Pearlfish Sea cucumbers are invertebrates that can be found on the ocean floor or on the reef. They have small suction-cup feet to help them move. They breathe out of their anus and can shoot out their internal organs when they detect a predator. Then they regrow their insides. The pearlfish is a long, slim fish. They have no scales but they do have long fins that run along the length of their bodies. Relationship: Commensalism "The pearlfish uses the sea cucumber for a hide-out from predators. The pearlfish will live in the sea cucumber’s anus, backing into the hole tail-first so its head can stick out." "When a predator of the pearlfish comes by, it will bring its head in so it can’t be detected. The sea cucumber is unaffected by this activity."