Active metabolic rate of masu salmon determined by respirometry

Abstract

The relationships between tailbeat frequency, oxygen consumption, temperature and swimming speed (U) were determined for Japanese masu salmon Oncorhynchus masou using swimming respirometry. Fish of mean body length (BL) 29.0 cm displays similar characteristics to other salmonids with tailbeat frequency (TBF) characterized as TBF=0.698 U (U; BL/s)+1.560 at 12°C (n=13) and TBF=0.738 U+1.585 at 18°C (n=9), active metabolic rate described as log M_O2=0.233 U+0.339 at 12°C and log M_O2=0.201U+0.643 at 18°C, estimated standard metabolic rates of 2.19 and 4.39 mM O₂/kg/h for fish swum at 12°C and 18°C, respectively, and an active metabolic rate Q₁₀ of 2.88 at 2 BL/s.