| Summary: | The prolonged swimming speed and metabolic rate of 0þ year Arctic grayling Thymallus articus were examined with respect to current velocity, water temperature and fish size, and compared to conditions fish occupy in the river. Oxygen consumption (mg O2 h 1) increased with fish mass and temperature (6–23 C), with a steep increase in metabolic rate between 12 and 16 C. Absolute prolonged swimming speed (cm s1) increased rapidly with fish size (total length, LT, and mass), however, fish in the natural stream habitat occupied current velocities between 15 and 25 cm s1 or 4 LT s 1, approximately half their potential prolonged swimming speed (10 LT s
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