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Ovulation of Tasmanian Atlantic salmon maintained at elevated temperatures: implications of climate change for sustainable industry development
King, H.R.; Pankhurst, N.W. (2000). Ovulation of Tasmanian Atlantic salmon maintained at elevated temperatures: implications of climate change for sustainable industry development, 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. 396-398
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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  • King, H.R.
  • Pankhurst, N.W.
Abstract
    Tasmanian Atlantic salmon were held at water temperatures of 6, 11 or 16 degree C from late vitellogenesis and plasma steroid levels and ovulation were assessed. Ovulation was delayed at 11 degree C relative to 6 degree C, and inhibited at 16 degree C, prior to temperature reduction. Pre-ovulatory changes in levels of gonadal steroids occurred first at 6 degree C then at 11 degree C but did not occur at 16 degree C before temperature reduction. The quality of ova from fish held at 16 degree C was significantly reduced. These results demonstrate apparent temperature inhibition of endocrine processes associated with maturation but suggest that acute temperature manipulation may restore ovulation in heat-exposed fish. However, 17 beta -estradiol (E sub(2)) levels were lower at 16 degree C, suggesting that vitellogenesis may also be affected
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