title: Modelling energetic costs of fish swimming.
abstract: The oxygen consumption rates of two cyprinid fishes, carp (Cyprinus carpio L.) and roach (Rutilus rutilus (L.)), were analysed for a wide range of body mass and swimming speed by computerized intermittent-flow respirometry. Bioenergetic models were derived, based on fish mass (M) and swimming speed (U), to predict the minimal speed and mass-specific active metabolic rate (AMR) in these fishes (AMR=aMbUc). Mass and speed together explained more than 90% of the variance in total swimming costs in both cases. The derived models show that carp consume far more oxygen at a specific speed and body mass, thus being less efficient in energy use during swimming than roach. It was further found that in carp (AMR=0.02M0.8U0.95) the metabolic increment during swimming is more strongly effected by speed, whereas in roach (AMR=0.02M0.93U0.6) it is more strongly effected by body mass. The different swimming traits of carp and roach are suitable for their respective lifestyles and ecological demands.
authors: Leibniz-Institute of Freshwater Ecology and Inland Fisheries, 12587 Berlin, Germany.
authors: Jan
authors: J
authors: Ohlberger
authors: Georg
authors: G
authors: Staaks
authors: Peter L M
authors: PL
authors: van Dijk
authors: Franz
authors: F
authors: Hölker
mesh_terms: D000818:Animals; D001835:Body Weight / Q000502:physiology; D003530:Cyprinidae / Q000502:physiology*; D004734:Energy Metabolism / Q000502:physiology*; D016014:Linear Models; D008954:Models, Biological; D010101:Oxygen Consumption / Q000502:physiology; D013550:Swimming / Q000502:physiology*