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JPR Advance Access published online on February 22, 2006
Journal of Plankton Research, doi:10.1093/plankt/fbi138
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org
Received September 30, 2005
Accepted February 10, 2006

Article

Horizontal distribution of Thetys vagina Tilesius (Tunicata, Thaliacea) in the Japan Sea during spring 2004

Naoki Iguchi 1 * and Hideaki Kidokoro 1

1 Japan Sea National Fisheries Research Institute, Fisheries Research Agency, 1 Suido-cho, Niigata 951-8121, Japan

* To whom correspondence should be addressed.
Naoki Iguchi, E-mail: iguchi{at}affrc.go.jp


  Abstract

The occurrence of the salp Thetys vagina was observed in the Japan Sea during spring 2004. Catches up to 187 kg wet weight per 2.18 x 105 m3 (equal to ca. 0.9 g WW m-3) were collected with 10-m diameter surface-water otter trawl nets. The horizontal distribution indicated that the high biomass was related to the area with high chlorophyll a (Chl a) concentration, which was located around the subarctic front with the warm Tsushima Current. Five prey taxa were identified from the gut contents of individuals from the high Chl a area. The diatom Coscinodiscus spp. (13-55 µm in diameter) dominated numerically. Another significant prey was the large diatom Coscinodiscus wailesii (219-313 µm), which is an indicator of the spring bloom in this area. The mass occurrence of Thetys vagina thus appears related to phytoplankton availability though the mechanisms remain uncertain.

Communicating Editor: KJ Flynn


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