The pinecone fish (Monocentris japonica) is a small armored fish, up to about 6 inches that lives in the West Pacific at depths of 10 - 200m. On he lower side of their jaw they have two large phosphorescent organs that they can use to attract their planktonic prey at night. This organ is filled with symbiotic bioluminescent bacteria (Vibrio fischeri). They have a flap on their jaw that allows them to regulate the light being released. During the day these fish tend to hang out in caves. They have large spines on their dorsal and ventral sides that they use to lock themselves into the rock.