NDLI: Evidence of westward transoceanic migration of Pacific bluefin tuna in the Sea of Japan based on stable isotope analysis

Content Provider	Springer Nature Link
Author	Tawa, Atsushi Ishihara, Taiki Uematsu, Yuki Ohshimo, Seiji
Copyright Year	2017
Abstract	Pacific bluefin tuna (Thunnus orientalis; PBFT) is a highly migratory species, with some individuals migrating between the western Pacific Ocean (WPO) and eastern Pacific Ocean (EPO). In this study, we used stable isotope analysis to identify PBFT that had recently undergone westward transoceanic migration on the Sea of Japan. A total of 155 PBFT individuals were examined. Their ages ranged from 2 to 17 years, with most individuals being 2–7 years of age. Individuals from each year class were classified as WPO residents or recent EPO migrants using cluster analysis of δ15N values. Individuals aged 2, 6, and over 7 years had unimodal distributions of δ15N values, while individuals aged 3, 4 and 5 years showed a bimodal distribution with high- and low-δ15N groups. Due to the overall higher baseline of δ15N values in the EPO, high δ15N individuals were considered to represent PBFT that had migrated from the EPO. Though individuals aged 6 and over 7 years showed unimodal distributions in the cluster analysis, discriminant analysis indicated that these PBFT also included some migrants from the EPO. We preliminary estimated the percentages of migrants and residents in the Sea of Japan. Such information can improve stock assessments models for PBFT and contribute to the sustainable stock management of this species.
Starting Page	1
Ending Page	7
Page Count	7
File Format	PDF
ISSN	00253162
Journal	Marine Biology
Volume Number	164
Issue Number	4
e-ISSN	14321793
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2017-03-30
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Age SIA Movements Marine predators Stock structure Marine & Freshwater Sciences Freshwater & Marine Ecology Oceanography Microbiology Zoology
Content Type	Text
Resource Type	Article
Subject	Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics

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Immature Pacific bluefin tuna, Thunnus orientalis, utilizes cold waters in the Subarctic Frontal Zone for trans-Pacific migration

Archival tagging reveals swimming depth and ambient and peritoneal cavity temperature in age-0 Pacific bluefin tuna, Thunnus orientalis, off the southern coast of Japan

Erratum to: Immature Pacific bluefin tuna, Thunnus orientalis, utilizes cold waters in the Subarctic Frontal Zone for trans-Pacific migration

Differential growth rates related to initiation of piscivory by hatchery-reared larval Pacific bluefin tuna Thunnus orientalis

Inter-laboratory comparison of Atlantic and Mediterranean bluefin tuna otolith microconstituents

Distribution, growth and hatch date of juvenile Pacific bluefin tuna Thunnus orientalis in the coastal area of the sea of Japan

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Evidence of westward transoceanic migration of Pacific bluefin tuna in the Sea of Japan based on stable isotope analysis

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