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In most arthropod species that have superposition compound eyes, light reflected by the tapetum and not absorbed by the rhabdoms is visible as eyeshine (Kunze, 1979).
It was shown that in many species there is a decreasing gradient of eyeshine intensity along the anteroposterior axis of the eye.
We set out to investigate the features of eyeshine in mesopelagic decapods and to suggest how the variations found may be related to their life history and depth distribution.
Eyeshine distribution and intensity was examined using a variation of the protocol developed by Shelton et al.
Eyeshine distribution patterns were observed and recorded from 136 eyes from 19 species (Table 1).
There were noticeable differences in the diameter of the eyeshine patches under the two different colors of light used.
Because there was a significant difference in the diameter of the eyeshine patch under white and green light, this study used only the measurements of diameter and intensity made under green illumination, which more closely resembles the light that mesopelagic species would experience normally (Kirk, 1983).
For the 19 species examined, the general trend is for eyeshine to be brightest ventrally (Table 1).
For five species (Acanthephyra pelagica, Oplophorus spinosus, Sergia grandis, Sergia robustus, and Systellaspis cristata) both dorsal and ventral eyeshine increased with carapace length (Table 1).
The light makes the eyeshine of the animals easier to spot and they often remain to continually stare at the light and do not appear to see the light as a threat as they normally would view a human.
Fierce Foil Eyeshines has gloss technology to instantly impart a beautiful multidimensional foil finish to eyes.
Abstract: The distribution and abundance of a population of Caiman crocodilus fuscus were estimated by monthly counting of eyeshines at night, from February 1999 to March 2000 in six transects of Rio Frio in the Cano Negro National Refuge (RNVSCN), Northern Costa Rica.
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