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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on June 30, 2007
ICES Journal of Marine Science: Journal du Conseil 2007 64(7):1387-1395; doi:10.1093/icesjms/fsm091
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© 2007 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Effect of El Niño on migration and larval transport of the Japanese eel (Anguilla japonica)

Heeyong Kim1,, Shingo Kimura1, Akira Shinoda1, Takashi Kitagawa1, Yoshikazu Sasai2 and Hideharu Sasaki2

1 Ocean Research Institute, University of Tokyo, 1-15-1 Minamidai, Nakano, Tokyo 164-8639, Japan
2 Earth Simulator Centre, Japan Agency for Marine–Earth Science and Technology, 3173-25 Showa-machi, Kanazawa-ku, Yokohama, Kanagawa 236-0001, Japan

Correspondence to H. Kim: tel: +81 3 5351 6504; fax: +81 3 5351 6508; e-mail: kimhy{at}ori.u-tokyo.ac.jp

Kim, H., Kimura, S., Shinoda, A., Kitagawa, T., Sasai, Y., and Sasaki, H. 2007. Effect of El Niño on migration and larval transport of the Japanese eel (Anguilla japonica). – ICES Journal of Marine Science, 64: –.

To clarify the effect of an El Niño on the migration of Japanese eels (Anguilla japonica) in the western North Pacific, differences in migration patterns of eel larvae (leptocephali) in El Niño and non-El Niño years were compared qualitatively through a numerical particle-tracking model. Depending on interannual meridional displacements of the salinity front and bifurcation of the North Equatorial Current, transport of Japanese eel larvae to the Kuroshio was much less than to the Mindanao Current in an El Niño year, and recruitment to coastal habitats in Japan decreased in those years. In non-El Niño years, transport to the Kuroshio was twice as high, and recruitment to coastal habitats increased. If the spawning area of eels was independent of El Niño, transport differences between the two currents were not clear. In the western North Pacific, mesoscale eddies also played a significant role in dispersing eel larvae and prolonging their migration. Consequently, the changing oceanic conditions associated with climate change have resulted in decreased recruitment of Japanese eels, and the eddy effect on migration of the Japanese eel larvae needs to be added into the North Equatorial Current–Kuroshio system.

Keywords: El Niño, Japanese eel, larval migration, mesoscale eddy, NEC bifurcation, salinity front

Received 3 January 2007; accepted 24 May 2007; advance access publication 30 June 2007.


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