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JPR Advance Access published online on September 30, 2004
Journal of Plankton Research, doi:10.1093/plankt/fbh146
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Received December 12, 2003
Accepted August 27, 2004

Article

The effects of temperature on metabolism, growth and growth efficiency of Thysanoessa longipes (Crustacea: Euphausiacea) in the Japan Sea

Naoki IGUCHI 1* and Tsutomu IKEDA 2

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

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


  Abstract

Growth (assessed from intermolt period and molt increment) and metabolism (oxygen consumption) of juvenile and adult Thysanoessa longipes from central Japan Sea were determined at eight temperatures ranging from 0 to 14°C. The intermolt period shortened progressively as temperature increased from 0 to 14°C. The molt increment was not satisfactorily assessed in the rearing experiments, and therefore this was estimated from the natural growth curve and habitat temperature, combined with the laboratory obtained intermolt data. Oxygen consumption rates increased exponentially from 0 to 8°C, and then leveled off. From these results, the growth was expressed as a function of temperature and body size, and metabolism as a function of temperature. Because of the differential effects of temperature on growth and metabolism, the net growth efficiency (NGE: 100 x growth / (growth + metabolism)) changed with temperature. The temperature at which T. longipes attained maximum NGE varied from 0 to 8°C depending on the body length of specimens of 5, 10, 15 and 20 mm. The present results are compared with our previous data on Euphausia pacifica in relation to the body composition and habitat usage of these two trophically important species in the food web of the Japan Sea.


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