A photophore is a glandular organ that appears as luminous spots on various marine animals, including fish and cephalopods. The organ can be simple, or as complex as the human eye; equipped with lenses, shutters, color filters and reflectors. The bioluminescence can variously be produced from compounds during the digestion of prey, from specialized mitochondrial cells in the organism, called photocytes ("light producing" cells), or, similarly, associated with symbiotic bacteria in the organism that is cultured.
Photophores are found on some cephalopods, including firefly squid, the sparkling enope or firefly squid, which can create impressive light displays. as well as numerous other deep sea organisms such as the pocket shark Mollisquama mississippiensis .
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