Resumen del producto

¹ Southwest Fisheries Science Center
² Monterey Bay Aquarium
³ Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas, Pesquerías y Biología Marina

Routine and postprandial oxygen consumption rates of dolphinfish (Coryphaena hippurus) were assessed over a wide size range (4.30 – 18.50 kg) and variable temperatures (21.0-24.5 °C) at preferred swimming velocities using a large 8850 l static respirometer. Post-meal oxygen consumption was determined following feedings of 3-13% body mass, with meals of variable caloric value of either sardine or squid to examine the magnitude of specific dynamic action. Postprandial oxygen consumption was elevated for up to 41 hours post ingestion and was linearly correlated with meal size and caloric value, resulting in a maximum 3.1X increase in metabolic rate with the largest meals. These trends mirror those observed in other teleost fishes, and postprandial oxygen consumption was similar in magnitude to that of tunas (family Scombridae). In addition to metabolic data, video recordings from the trials were collated to examine routine and post-meal swimming speeds and behavior. Some individuals exhibited a tilted swimming posture, which may provide some hydrostatic lift and consequent energy savings. Future research efforts should seek to link lab-based energetic estimates and observations with field-based movements and behavior to accurately gauge true energetic costs in the wild. The emergence of accelerometers capable of measuring tilt, speed, acceleration, and tailbeat frequency, along with environmental parameters such as temperature, can further refine such energetic cost estimates.

Palabras clave: Oxigen consuption; dolfinfish; captivity

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