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Horizontal distribution and habitat conditions of surface migratory myctophid juveniles in the Kuroshio region off southern and central Japan

Published online by Cambridge University Press:  02 April 2025

Chiyuki Sassa Open the ORCID record for Chiyuki Sassa [Opens in a new window] ,
Hiroshi Kuroda  and
Akinori Takasuka
Chiyuki Sassa*
Affiliation:
Nagasaki Field Station, Pelagic Fish Resources Division, Fisheries Stock Assessment Center, Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Nagasaki, Nagasaki 851-2213, Japan
Hiroshi Kuroda
Affiliation:
Kushiro Field Station, Marine Environment Division, Fisheries Stock Assessment Center, Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Kushiro, Hokkaido 085-0802, Japan
Akinori Takasuka
Affiliation:
National Research Institute of Fisheries Science, Japan Fisheries Research and Education Agency, Yokohama, Kanagawa 236-8648, Japan
*
Corresponding author: Chiyuki Sassa; Email: [email protected]
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Abstract

Surface migratory myctophids migrate nocturnally from the mesopelagic to the near-surface layers and are the dominant components of oceanic neuston fish assemblages. We examined the horizontal distribution and habitat conditions of juvenile surface migratory myctophids in the Kuroshio region in late winter from 2003 to 2016. In total, 9098 myctophid juveniles, including 17 species, were collected in the surface layer at night. Of these, the eight most abundant species accounted for 99.0%. They showed five distinct distribution patterns closely related to the position of the Kuroshio axis. Dasyscopelus orientalis was restricted to the inshore side of the Kuroshio axis (INK), where sea surface temperature (SST) was lowest but zooplankton biomass (ZPB), a proxy for food availability, was highest. The centre of distribution of D. asper and D. obtusirostris was in the area of the axis (KUA), where the highest SST and intermediate ZPB were observed, although they were also abundant in INK. Dasyscopelus spinosus was collected mainly in the area south of Kyushu Island adjacent to upstream of the Kuroshio. The distributions of Symbolophorus evermanni, Centrobranchus nigroocellatus, and Myctophum nitidulum were restricted to the offshore side of the axis (OFK), where intermediate SST and lowest ZPB were observed. Hygophum reinhardtii was collected abundantly in both OFK and KUA. Spatial habitat segregation of juveniles would result from differences in spawning grounds and larval and juvenile transport routes. The Kuroshio contributes to the biodiversity of myctophids along the Pacific coast of southern and central Japan by creating adjacent but distinct habitat conditions.

Keywords

horizontal distribution patternsKuroshio axisMyctophinaenear-surface layerneuston netspatial habitat segregationsurface migratory myctophids
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 105 , 2025 , e36
Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of Marine Biological Association of the United Kingdom.

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Footnotes

Akinori Takasuks’s present address: Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo, Tokyo 113-8657, Japan.

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