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Effects of reduced seasonal cycle and LHRHa injections during the vitellogenic phase on sexual maturation in perch (Perca fluviatilis)
Jentoft, S.; Andersen, Ø.; Juell, J.-E. (2000). Effects of reduced seasonal cycle and LHRHa injections during the vitellogenic phase on sexual maturation in perch (Perca fluviatilis), 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. 447
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 
  • Jentoft, S.
  • Andersen, Ø.
  • Juell, J.-E.
Abstract
    Effects of reduced seasonal cycle and injections of LHRHa and pimozide on sexual maturation in perch (Perca fluviatilis) were investigated. 150 tagged perch were split into two groups and subjected to two months with decreasing temperature and day length followed by two months with increasing temperature and day length. One group was treated monthly with LHRHa (30 µg/kg) and pimozide (10 mg/kg). From October to December testosterone (T) levels in females increased from 0.2 to 16.4 nmol/l while estradiol-17 beta (E sub(2)) levels increased from 0.8 to 6.6 nmol/l. The sex steroids were not significantly higher in the hormone treated group than in the control group. 3 % of the treated females spawned at the end of the study, while no spawning was observed in the control group.
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