Abstract
Abstract One of the most difficult components to measure in the energy budgets of natural fish populations is the energy released in metabolism. Telemetry of physiological correlates of metabolism, such as heart rate, can (with calibration) enable direct measurements of metabolism and simultaneous observations of behavior in the natural environment. Heart rate is a good indicator of metabolic rate for northern pike Esox lucius and was used to obtain information on metabolism, activity, and food intake in the natural environment. Mean field metabolic rates were 1.5 times standard metabolic rate. Activity metabolism accounted for 5–10% of total metabolism and was approximately an order of magnitude greater than estimates based on mean swimming speed derived from location tracking. Feeding metabolism was 15–25% of total metabolism. Even when the full metabolic rate calibration is not considered. physiological telemetry can provide useful information on patterns of energy expenditure ofdirect relevance to bio...
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