Horizontal distribution of Thetys vagina Tilesius (Tunicata, Thaliacea) in the Japan Sea during spring 2004 |
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Authors: | Iguchi, Naoki Kidokoro, Hideaki |
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Affiliation: | Japan Sea National Fisheries Research Institute, Fisheries Research Agency, 1 Suido-Cho, Niigata 951-8121, Japan |
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Abstract: | The occurrence of the salp Thetys vagina was observed in theJapan Sea during spring 2004. Catches up to 187 kg wet weight(WW) per 2.18 x 105 m3 (equal to 0.9 g WW m3) were collectedwith 10-m diameter surface-water otter trawl nets. The horizontaldistribution indicated that the high biomass was related tothe area with high chlorophyll a (Chl a) concentration, whichwas located around the subarctic front with the warm TsushimaCurrent. Five prey taxa were identified from the gut contentsof individuals from the high Chl a area. The diatom Coscinodiscusspp. (1355 µm in diameter) dominated numerically.Another significant prey was the large diatom Coscinodiscuswailesii (219313 µm) that is an indicator of thespring bloom in this area. The mass occurrence of T. vaginathus appears related to phytoplankton availability, though themechanisms remain uncertain. |
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