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Hormonal control of homing migration in salmonid fishes
Ueda, H.; Urano, A.; Zohar, Y.; Yamauchi, K. (2000). Hormonal control of homing migration in salmonid fishes, 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. 95-98
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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  • Ueda, H.
  • Urano, A.
  • Zohar, Y.
  • Yamauchi, K.
Abstract
    The salmon homing migration is closely related to gonadal maturation, which is regulated mainly by the brain-pituitary-gonadal axis. In particular, salmon gonadotropin-releasing hormone (sGnRH) produced from the ventrocaudal telencephalon and the preoptic area, gonadotropins (GtH I and II) from pituitary gland, and gonadal steroid hormones seem to play important roles in both the homing migration and gonadal maturation in salmonids. The present paper presents gene expression profiles of sGnRH and GtHs as well as serum gonadal steroid hormone profiles in anadromous chum salmon (Oncorhynchus keta) during the homing migration. Recent attempts using intramuscular GnRH analog (GnRHa) implantation to shorten homing duration and to accelerate gonadal maturation in lacustrine and anadromous sockeye salmon (O. nerka) are also described. These findings indicate sexual differences in homing profiles which may be reflective of changes in serum steroid hormone levels in salmonid fishes.
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