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In vivo and in vitro ovarian steroid production by fish from a natural population of the brooding tropical damselfish Acanthochromis polyacanthus
Pankhurst, N.W.; Pankhurst, P.M.; Hilder, P.I.; Hilder, M.L. (2000). In vivo and in vitro ovarian steroid production by fish from a natural population of the brooding tropical damselfish Acanthochromis polyacanthus, 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. 99-102
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., more
In: International Symposium on the Reproductive Physiology of Fish. Museo Nacional de Ciencias Naturales. , more
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Keyword
    Marine/Coastal
Authors  Top 
  • Pankhurst, N.W.
  • Pankhurst, P.M.
  • Hilder, P.I.
  • Hilder, M.L.
Abstract
    Spiny damselfish were captured from natural populations and plasma levels of gonadal steroids and the capacity of ovarian tissue to produce steroids in vitro was assessed across the boundary between regressed and reproductively active fish. Vitellogenic fish had higher plasma levels of testosterone (T) than previtellogenic fish and measurable levels of 17 beta -estradiol (E sub(2)) (non-detectable in regressed fish). Vitellogenic follicles were gonadotropin (GtH) sensitive and produced T and E sub(2) in response to steroid precursors, whereas previtellogenic follicles were less GtH sensitive, and did not reliably produce steroids from precursors. The level of blockade is suggested to be at the GtH receptor level and also in the capacity of ovarian tissue to convert steroid substrates upstream of T.
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