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JPR Advance Access originally published online on May 14, 2004
Journal of Plankton Research 2004 26(9):1015-1023; doi:10.1093/plankt/fbh092
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Journal of Plankton Research Vol. 26 No. 9 © Oxford University Press 2004; all rights reserved

Vertical distribution, population structure and life history of Thysanoessa longipes (Crustacea: Euphausiacea) around Yamato Rise, central Japan Sea

Naoki Iguchi* and Tsutomu Ikeda1

Japan Sea National Fisheries Research Institute, Fisheries Research Agency, 1 Suido-Cho, Niigata 951-8121 and 1 Marine Biodiversity Laboratory, Graduate School of Fisheries Sciences, Hokkaido University, 3-1-1 Minatomachi, Hakodate 041-0821, Japan

* Corresponding Author: iguchi{at}affrc.go.jp

Received on December 12, 2003; accepted in principle April 22, 2004; accepted for publication May 4, 2004; published online May 14, 2004

The diel vertical migration, growth and spawning season of the euphausiid, Thysanoessa longipes, were investigated using seasonal samples collected from waters around the Yamato Rise, central Japan Sea, during the period 1987 to 1999. Thysanoessa longipes was present throughout a broad bathymetric layer extending down as deep as 1000 m. There was a clear trend for larger specimens to occur at deeper depths. The peak of abundance of the total population occurred at depths of 30–300 m at night, and 150–500 m during the day, and the distance of the diel vertical migrations of the total population was estimated to be between 100 and 150 m. Population structure analysis revealed the occurrence of three cohorts aged 0+, 1+ and 2+ years, with females attaining a larger body size than males. Growth as determined by body length was found to fit well to the von Bertalanffy growth equation. The estimated life span for males and females is 3 years, and females reach maturity in 2 years. Based on the occurrence of calyptopis larvae, spawning of T. longipes was estimated to occur over only a limited period of the year between April and May.


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