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Extra-retinal photoreceptors are more important than retinal photoreceptors for sexual maturation in the three-spined stickleback (Gasterosteus aculeatus)
Bornestaf, C.; Borg, B. (2000). Extra-retinal photoreceptors are more important than retinal photoreceptors for sexual maturation in the three-spined stickleback (Gasterosteus aculeatus), in: Norberg, B. et al. (Ed.) Proceedings of the 6th International Symposium on the Reproductive Physiology of Fish, Bergen, Norway, July 4-9, 1999. pp. 138
In: Norberg, B. et al. (2000). Proceedings of the 6th International Symposium on the Reproductive Physiology of Fish, Bergen, Norway, July 4-9, 1999. International Symposium on the Reproductive Physiology of Fish, 6. Department of Fisheries and Marine Biology, University of Bergen: Bergen. ISBN 82-7461-048-2. 499 pp., meer
In: International Symposium on the Reproductive Physiology of Fish. Museo Nacional de Ciencias Naturales. , meer
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  • Bornestaf, C.
  • Borg, B.
Abstract
    In sticklebacks extra-retinal photoreception can mediate photoperiodic effects on reproduction. To examine the possible mediating role of the retina, black or transparent plastic was sewn onto their heads covering extra-retinal photoreceptors. Fish were then kept for 33 days under three different light intensities or full dark. Control fish matured significantly more than covered fish in the three light intensities. This suggests that retinal photoreceptors are ineffective, or at least less effective than extraretinal photoreceptors, in mediating photoperiodic stimulation of reproduction in sticklebacks.
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