title: Plasma levels on thyroid hormones in sockeye salmon (Oncorhynchus nerka) decrease before spawning.
abstract: Blood samples were taken from mature sockeye salmon (Oncorhynchus nerka) at various stages in their upstream migration to spawn at Adam's River in British Columbia, Canada. Plasma T3 and T4 levels decreased significantly in both males and females between time of entry into fresh water and postspawning.
mesh_terms: D000818:Animals; D002170:Canada; D005260:Female; D005618:Fresh Water; D008297:Male; D010058:Oviposition; D012098:Reproduction; D012474:Salmon / Q000502:physiology*; D012741:Sexual Maturation; D013974:Thyroxine / Q000097:blood*; D014284:Triiodothyronine / Q000097:blood*
chemical_list: D014284:Triiodothyronine; D013974:Thyroxine