Abstract
A model, based on hydrodynamic theory, predicting least-cost swimming speed and cost of transport in mg O 2·kg −1·km −1 in relation to body length for pelagic estuarine fishes, indicated that least-cost swimming speeds in length-specific terms are less for larger fish than for smaller fish. Predicted least-cost swimming speeds ranged from 1.3 lengths per second for a 50-cm fish to 4.7 lengths per second for a 10-cm fish. The predicted minimum cost of transport for a fish 30 cm in body length was 110 mg O 2·kg −1·km −1. Predictions from the model were consistent with empirically derived estimates for least-costs swimming speeds and cost of transport values for four estuarine species.
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