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Lunar synchronization of gonadal development, and changes in plasma levels of gonadal steroids and vitellogenin in golden rabbitfish, Siganus guttatus
Saydur, R.M.; Takemura, A.; Takano, K. (2000). Lunar synchronization of gonadal development, and changes in plasma levels of gonadal steroids and vitellogenin in golden rabbitfish, Siganus guttatus, 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. 180
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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  • Saydur, R.M.
  • Takemura, A.
  • Takano, K.
Abstract
    Lunar periodicity of gonadal development in the golden rabbitfish, Siganus guttatus, was studied using histological observation of gonads, and immunological measurements of plasma sex steroid hormones and a yolk precursor, vitellogenin (VTG). Histological gonad development was observed to occur in June and July and peaked at the first quarter moon of each month. Plasma steroid hormones and VTG concentrations were measured weekly and correlated closely with gonadal activity. These cyclic changes support the hypothesis that the lunar periodicity is a major factor in stimulating reproductive activity in S. guttatus.
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