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- Title
Changes in GnRH levels in the brain and pituitary gland during migrations of sockeye salmon and chum salmon.
- Authors
Kitani, T.; Matsumoto, S.; Yamada, H.; Amano, M.; Iwata, M.; Ueda, H.
- Abstract
Levels of two moleculer types of gonadotropin-releasing hormone (GnRH), salmon GnRH (sGnRH) and chicken GnRH-II (cGnRH-II) in the various brain regions and pituitary gland of sockeye salmon (Oncorhynchus nerka) and chum salmon (O. keta) during smoltification and spawning migration, respectively, were measured using specific time-resolved fluoroimmunoassay (TR-FIA) systems. Changes in sGnRH levels in different brain regions tended to be specifically synchronized with serum thyroid hormone or pituitary gonadotropin (GTH) levels during smoltification and spawning migration, respectively. In contrast, cGnRH-II levels did not show such synchronized changes. SGnRH and cGnRH-II in various brain regions might have different roles during smoltification and spawning migration of salmonid fishes.
- Subjects
FISH migration; ENDOCRINOLOGY; GONADOTROPIN releasing hormone; SOCKEYE salmon; CHUM salmon; NEUROENDOCRINOLOGY
- Publication
Fish Physiology & Biochemistry, 2003, Vol 28, Issue 1-4, p269
- ISSN
0920-1742
- Publication type
Article
- DOI
10.1023/B:FISH.0000030549.43551.89