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Size-dependent growth tactics of a partially migratory fish before migration

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Title: Size-dependent growth tactics of a partially migratory fish before migration
Authors: Futamura, Ryo Browse this author
Morita, Kentaro Browse this author →KAKEN DB
Kanno, Yoichiro Browse this author
Kumikawa, Shoji Browse this author
Matsuoka, Yuichi Browse this author
Okuda, Atsushi Browse this author
Sugiyama, Hiroshi Browse this author
Takahashi, Hiroyuki Browse this author
Uchida, Jiro Browse this author
Kishida, Osamu Browse this author →KAKEN DB
Keywords: Anadromous fish
Growth period
Growth rate
Life history
Oncorhynchus masou
Issue Date: 22-Jan-2022
Publisher: Springer
Journal Title: Oecologia
Volume: 198
Issue: 2
Start Page: 371
End Page: 379
Publisher DOI: 10.1007/s00442-022-05111-0
Abstract: In many migratory species, smaller migrants suffer higher mortality rates during the risky migration. To minimize the size-selective mortality, migrants with smaller body sizes would need to accelerate growth rates or delay migration timing to attain a large enough body size prior to migration. To test these predictions, we investigated size-dependent patterns of growth rates and migration timing of juvenile masu salmon (Oncorhynchus masou) before their oceanic migration. We tracked uniquely marked individuals in a study population consisted of oceanic migrants and river-dwelling residents using mark-recapture surveys and PIT-tag antenna-reader system. Data supported our predictions about size-dependent growth rates and migration timing. For approximately 6 months before outmigration (i.e., between the decision of migration and the start of migration), eventual migrants grew more than residents if their initial size was smaller, but such a difference in growth rate diminished for fish with larger initial sizes. In addition, smaller eventual migrants delayed the timing of outmigration compared to larger individuals, to attain a larger body size in the river prior to migration. These results suggest that size-selective mortality during migration has shaped size-dependent patterns of the pre-migration growth in migratory masu salmon. Size-conditional changes in growth rate and duration of pre-migration period may be an adaptive tactic for the migratory animals.
Type: article (author version)
Appears in Collections:北方生物圏フィールド科学センター (Field Science Center for Northern Biosphere) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 岸田 治

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