This eelpout, about 7 cm long, swims about in a darkened, chilled aquarium. When illuminated, It curls up in a ball and hangs motionless in the water. To a predator it may appear too large to swallow, or perhaps it resembles a jellyfish with stinging cells.
This is a male cabezon--females generally are green. Cabezon lack scales and have skin flaps over their snout and eyes. They often take shelled animals such as crabs, abalone and other snails but also squid, octopus, and fish. Depth 20 m.