MEPS 163:285-288 (1998)  -  doi:10.3354/meps163285

Respiration rate and swimming speed of the necrophagous amphipod Eurythenes gryllus from Antarctic deep waters

Ichiro Takeuchi1,*, Kentaro Watanabe2

1Otsuchi Marine Research Center, Ocean Research Institute, University of Tokyo, Akahama, Otsuchi, Iwate 028-11, Japan
2National Institute of Polar Research, Kaga 1-Chome, Itabashi, Tokyo 173, Japan

During the 35th JARE (Japanese Antarctic Research Expedition) Cruise, we collected large lysianassoid amphipods Eurythenes gryllus alive from 3186 m depth off Lützow-Holm Bay using a baited trap and measured the respiration rates and swimming speeds of amphipods on board (-0.5 to -1.0°C). The oxygen consumption rate (OC; µM ind.-1 h-1) was significantly correlated with the wet body weight (BW; g) for log10 transformed data; logOC = 0.190 + 0.647·logBW (p < 0.05). The swimming speed (SS; cm s-1), which was determined from video camera recordings made on amphipods placed in a plastic container, also showed a linear relationship with body weight for log10 transformed data; logSS = 0.412 + 0.515·logBW (p < 0.005). Using the regression of the swimming speed, the population density of E. gryllus was estimated based on a modification of an existing model of the area where the amphipods were attracted to the bait.

Ammonia-N excretion rate · Antarctic deep waters · Eurythenes gryllus · Lysianassoid amphipods · Respiration rate · Swimming speed

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