Hatchet fish

Bioluminescence functions in mating (fireflies, the Bahama fireworm), in the search for prey (angler fish, Photmus fireflies), camouflage (hatchet fish, squid), schooling (euphausiid shrimp), and to aid deep water fish (flashlight fish, Photoblepharon to see in the dark ocean depths. 

The light emission continues until all of the luciferin has been oxidized. This type of reaction is found in fireflies, Cypridina, Latia, and many types of fish, such as lantern fish or hatchet fish. 

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