The skin | Bioluminescence in Fishes

Marine teleost fish comprise one of the most diverse groups of luminescent animals with over 45 families and more than 190 genera containing luminescent species. Predominantly blue light is emitted diffusely through translucent tissue that harbors symbiotic bioluminescent bacteria, or discretely from complex photophores equipped with reflectors, lenses, and filters. Light displays can vary from quick flashes to long-lasting glows. Variety in form is matched by diversity in function with luminescence used for predation, defense, and intraspecific signaling.