Abstract
THE poeciliid Belonesox belizanus Kner has a mixture of two visual pigments in its retina. One of these is based on vitamin A1 (λmax = 498 mµ), the other on vitamin A2 (λmax = 521 mµ)1,2. Like the cyprinids Scardinius3 and Notemigonus2 the proportions of these pigments in the retina vary throughout the year, there being more of the vitamin A2-based pigment in the winter and less in summer2. As in Notemigonus4, there is considerable variation of retinal visual pigment composition among individuals of Belonesox caught at the same time and in the same place (Bridges, C. D. B., unpublished observations).
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References
Bridges, C. D. B., Nature, 203, 303 (1964).
Bridges, C. D. B., Nature, 203, 191 (1964).
Dartnall, H. J. A., Lander, M. R., and Munz, F. W., Progress in Photobiology, 203 (Elsevier, Amsterdam, 1961).
Bridges, C. D. B., Vision Res., 4, 233 (1964).
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BRIDGES, C. Visual Pigments in a Fish exposed to Different Light-Environments. Nature 206, 1161–1162 (1965). https://doi.org/10.1038/2061161a0
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DOI: https://doi.org/10.1038/2061161a0
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