Straightforward upriver migration to spawning sites by chum salmon Oncorhynchus keta homing to coastal short rivers in the Sanriku region.
chum salmon
coastal short river
maturation
river entry
sex steroid
upriver migration
Journal
Journal of fish biology
ISSN: 1095-8649
Titre abrégé: J Fish Biol
Pays: England
ID NLM: 0214055
Informations de publication
Date de publication:
Mar 2022
Mar 2022
Historique:
revised:
31
12
2021
received:
05
08
2021
accepted:
06
01
2022
pubmed:
12
1
2022
medline:
29
3
2022
entrez:
11
1
2022
Statut:
ppublish
Résumé
In chum salmon (Oncorhynchus keta) homed to the Sanriku region, Japan, most of the fish are matured in bays and spawn near river mouths in coastal short rivers; therefore, their upriver migration is extremely short, but their behavioural characteristics have remained unknown. Upriver migration in the Otsuchi River, a typical coastal river, was evaluated from behavioural and physiological aspects. Homing salmon tracked in Otsuchi Bay held in the inner bay for less than 1 day to more than 10 days before river entry. The varied holding duration was negatively correlated with plasma 17α, 20β-dihydroxy-4-pregnen-3-one (DHP) concentration, an indicator of maturation. After river entry, however, most fish were captured in weirs near the river mouths within 2 days regardless of the DHP concentration. Of the 34 fish released in the river, on the contrary, eighteen and five fish were seen next day in the main spawning sites located at c. 1.5 km upstream and in the branch creek, respectively, and 85% of the fish held position there until their death. The mean survival time of released fish was 5.8 days. Plasma DHP level suggested that preparations for spawning were already completed at the timing of the release. Taken together, homing salmon completed spawning preparation in the bay, and then they moved to their spawning sites immediately after river entry and spawned there during their short remaining life. This upriver migration contrasts with those of other populations, such as early migrants and long river migrants, whose maturation is completed during upriver migration.
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
748-757Subventions
Organisme : Japan Society for the Promotion of Science
ID : Scientific Research (C) (15K07544)
Organisme : Japan Society for the Promotion of Science
ID : Scientific Research (B) (16H04968)
Organisme : Japan Society for the Promotion of Science
ID : Challenging Exploratory Research (25660153)
Organisme : Ministry of Education, Culture, Sports, Science and Technology
ID : Tohoku Ecosystem-Associated Marine Science (TEAMS) research program
Organisme : Program 'Bio-Logging Science of the University of Tokyo' (UTBLS)
Informations de copyright
© 2022 Fisheries Society of the British Isles.
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