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JOURNAL OF PLANKTON RESEARCH | VOLUME 17 | NUMBER 9 | PAGES 1757-1769 | 1995
© Oxford University Press

research-article

Growth, metabolism and growth efficiency of a euphausiid crustacean Euphausia pacifica in the southern Japan Sea, as influenced by temperature

Naoki Iguchi and Tsutomu Ikeda1

Japan Sea National Fisheries Research Institute 1 Suido-cho, Niigata 951 Japan 1Seikai National Fisheries Research Institute 49 Kokubu-machi, Nagasaki 850, Japan

Received on September 29, 1994; accepted on April 29, 1995 Growth (assessed from intermolt period and molt increment) and metabolism (oxygen consumption) of the post-larva of Euphausia pacifica from the southern Japan Sea were determined at seven graded temperatures ranging from 1 to 25°C. The intermolt period shortened progressively as temperature increased from 1 to 20°C, but an effect of temperature on molt-to-molt growth increment was not seen. Oxygen consumption rates were accelerated by the increase in temperature up to 20°C. Beyond 20°C, E.pacifica exhibited reduced oxygen consumption and died within 1 day without molting. After removing the effect of body size, the relationships between growth rate and temperature, and between oxygen consumption rate and temperature, were established. The carbon budget was calculated as a function of temperature. Because of differential effects of temperature on growth and metabolism, the net growth efficiency [K2 growthx100/(growth+metabolism)] changed with temperature. The optimum temperature at which E.pacifica attained the maximum K2 was 11.4°C, which was derived from calculation of cumulative carbon invested in growth and metabolism in this animal. In an alternative method, the optimum temperature was obtained mathematically by solving a set of differential equations. The biological and ecological significance of the optimum temperature which leads to the maximum K2 is discussed.


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N. Iguchi and T. Ikeda
Effects of temperature on metabolism, growth and growth efficiency of Thysanoessa longipes (Crustacea: Euphausiacea) in the Japan Sea
J. Plankton Res., January 1, 2005; 27(1): 1 - 10.
[Abstract] [Full Text] [PDF]


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