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Routine oxygen consumption rates were measured for Dolphinfish (Coryphaena hippurus) (4.25 – 11.57 kg) at two temperatures (21.5 and 24.5 °C) at preferred swimming speeds using a large 8850 l static respirometer. Postprandial oxygen consumption was measured at both temperatures following meals of 5-14% body weight of either sardine or squid to examine the magnitude of specific dynamic action. Postprandial oxygen consumption was elevated for up to 35 hours post ingestion and was linearly correlated with meal size, resulting in a maximum 2.4X increase in metabolic rate with the largest meals. These patterns are similar to those exhibited by other teleost fishes and are of similar magnitude to tuna. In addition to metabolic data, videos taken throughout the experiments show that Dolphinfish spend a significant proportion of their swimming tilted to the side. This may provide some hydrostatic lift resulting in energetic costs savings. Future efforts should seek to link lab-based energetic estimates and observations with field-based movements and behavior to estimate true energetic costs in the wild. The advent of accelerometers which can measure tilt, speed, acceleration, and tailbeat frequency along with environmental parameters (e.g., temperature) can further refine such energetic cost estimates.

Palabras clave: oxygen consumption; Dolphinfish; metabolic rate

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