During the 35th JARE (Japanese Antarctic Research Expedition) Cruise, we collected large lysianassoid amphipods Eurythenes gryllus alive from 3186 m depth off Lutzow-Holm Bay using a baited trap and measured the respiration rates and swimming speeds of an~phipods on board (-0.5 to -l.O°C). The oxygen consumption rate (OC; FM ind.-' h-') was significantly correlated with the wet body weight (BW; g) for loglo transformed data; logOC = 0.190 + 0.647.logBW (p 0.05). The swimming speed (SS; cm S-'),

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... which was determined from video camera recordings made on amphipods placed in a plastic container, also showed a linear relationship with body weight for loglo transformed data; log SS = 0.412 + 0.515. log BW (p < 0.005). Using the regression of the swimming speed, the population density of E. gryllus was estimated based on a mo&fication of an existing model of the area where the amphipods were attracted to the bait.