The roles of filters in the photophores of oceanic animals and their relation to vision in the oceanic environment
- 22 July 1985
- journal article
- research article
- Published by The Royal Society in Proceedings of the Royal Society of London. B. Biological Sciences
- Vol. 225 (1238), 63-97
- https://doi.org/10.1098/rspb.1985.0051
Abstract
In many of the photophores found in deep-sea fishes and invertebrates, light filters containing pigments lie between the tissues that generate light and the sea. The loss of light within such filters has been measured throughout the visible spectrum for a variety of animals. These filters differ greatly in their spectral absorption characteristics and do not all contain the same pigments. All those from ventral photophores have a transmission band in the blue corresponding to the daylight that penetrates best into oceanic waters. For two fishes it is shown that the light generated inside their photophores is a relatively poor spectral match for the ambient submarine daylight while the light emitted into the sea, after passing through the filters, is a good match. For a third fish a similar improvement in `colour match' is brought about not by passing the light through a filter containing pigments but by reflecting the light into the sea by a blue mirror. All these observations support the hypothesis that the ventral photophores are used for camouflage. Malacosteus niger Ayres 1848 is an oceanic fish which emits red light from a large suborbital photophore. The red light generated inside the photophore is largely absorbed by a coloured filter over its external surface which transmits only a band of light of wavelengths around 700 nm. This is a waveband which is heavily absorbed by oceanic sea water. It is shown, however, that animals that can emit and are sensitive to such far-red light will have very great advantages in being able to see without being seen. The ranges over which such red light can be useful for vision are, however, relatively small. The nature of the pigments found in these various photophores is discussed. It is also calculated that the intensities of penetrating daylight are such that visual acuity could be fairly good down to considerable depths in the mesopelagic zone.This publication has 44 references indexed in Scilit:
- A system for the collection of comparative emission spectra suitable for shipboard useJournal of the Marine Biological Association of the United Kingdom, 1979
- Bioluminescence of lantern fish (Myctophidae) in response to changes in light intensityNature, 1977
- On the integument and photophores of the alepocephalid fishesXenodermichthysandPhotostylusJournal of the Marine Biological Association of the United Kingdom, 1976
- ULTRASTRUCTURE OF A CEPHALOPOD PHOTOPHORE. II. IRIDOPHORES AS REFLECTORS AND TRANSMITTERSThe Biological Bulletin, 1974
- The N.I.O. combination net (RMT 1 + 8) and further developments of rectangular midwater trawlsJournal of the Marine Biological Association of the United Kingdom, 1973
- Review lecture: On the organization of reflecting surfaces in some marine animalsPhilosophical Transactions of the Royal Society of London. B, Biological Sciences, 1970
- Function of Bioluminescence in Mesopelagic OrganismsNature, 1963
- The contributions of the orientated photosensitive and other molecules to the absorption of whole retinaProceedings of the Royal Society of London. B. Biological Sciences, 1959
- Purkinje Shift and Retinal NoiseNature, 1957
- Laboratory Analysis of the Selective Absorption of Light by Sea Water*Journal of the Optical Society of America, 1939