Effects of temperature, body size and feeding on rates of metabolism in young-of-the-year haddock

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The mean rate of oxygen consumption (routine respiration rate, R R, mg O2 fish-1 h-1), measured for individual or small, groups of haddock Melanogrammus aeglefinus (3-12 cm standard length, LS) maintained for 5 days within flow-through respiratory chambers at four different temperatures, increased with increasing dry mass (MD). The relationship between RR and M D was allometric (RR = α Mb) with b values of 0.631, 0.606, 0.655 and 0.650 at 5.0, 8.0, 12.0 and 15.0°C, respectively. The effect of temperature (T) and MD on mean R R was described by RR = 0.387·MD0.630·eT·0.082 (n = 82, r2 = 0.896) indicating a Q10 of 2.27 between 5 and 15°C. Juvenile haddock routine metabolic scope, calculated as the ratio of the mean of highest and lowest deciles of RR measured in each chamber, significantly decreased with temperature such that the routine scope at 15°C was half that at 5°C. The cost of feeding (RSDA) was c. 3% of consumed food energy, a value half that found for larger gadoid juveniles and adults. © 2005 The Fisheries Society of the British Isles.

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Journal of Fish Biology