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Journal of Plankton Research Vol.21 no.12 pp.2421-2430, 1999
© Oxford University Press 1999

Short Communications

Production of Oikopleura longicauda (Tunicata: Appendicularia) in Toyama Bay, southern Japan Sea

Mika Tomita1, Tsutomu Ikeda and Naonobu Shiga

Biological Oceanography Laboratory, Faculty of Fisheries, Hokkaido University, 3-1-1 Minatomachi, Hakodate 041-0821, Japan

1 Present address: Joetsu Environmental Science Center, 231-2, Shimomonzen, Joetsu-shi 942-0063, Japan

Oikopleura longicauda occurred throughout the year in Toyama Bay, southern Japan Sea, and analysis of its size composition and maturity revealed that reproduction was continuous overthe year. Somatic growth production (Pg) varied with season from 0.03 to 103 mg carbon (C) m–2day–1 (annual Pg 4.5 g C m–2), and house production (Pe) from 0.11 to 266 mg C m–2 day–1 (annualPe 11.3 g C m–2). The annual Pg/B ratio was 176. Compared with production data of some predominant zooplankton species in Toyama Bay, it is suggested that despite their smaller biomass, appendicularians are an important secondary producer.


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