Sunlight is only available up to a maximum depth of 1000m, while bioluminescence occurs throughout the water column and is the only source of light below 1000m. The deep-sea is therefore a visually very interesting environment. Current research involves the far red sensitivity of stomiid dragon fishes, and in collaboration with N.J.Marshall , a study of the visual optics of both mesopleagic and benthic fishes. J Comp Phys, 177. On the visual pigments of deep-sea fish.
Dragon fish see using chlorophyll.
Lens pigmentation, tapeta and visual pigments. Phil Trans Roy Soc See also 'Lair of the Dragon' New Scientist 27th March 1999, pp30-35 Colour vision Fish are able to perceive a very broad spectrum of radiation, ranging from the near UV to the far red. I am interested in characterising this ability through the use of psychophysical methods, such as two choice operant conditioning, and visual pigment analysis. Psychophysics of depth perception Vertebrates use a variety of strategies for measuring the distance of objects in their surroundings. We study the cues used by both frogs and fish primarily through the use of psychophysical methods.