| Summary: | This thesis presents the results of a study, which aimed to understand and evaluate the locomotion of Atlantic salmon and Arctic char under three different swimming conditions, slow, medium and fast. A Fourier-series based numerical model that describes the swimming mode for each condition is presented and the control variables for a swimming fish are evaluated. The numerical model is based on a video analysis of a swimming fish. A video recording system was used to record the movement of two fish species under different swimming conditions in a respirometer tunnel. The movements of eleven points on the fishes were tracked from the video recordings and logged. The movements of each point were then analyzed in Matlab and a model constructed to describe the motion. Fourier series was used to determine the fish motion and mathematically important variables such as frequency, amplitude, acceleration, phase difference and the most important factor, flexibility. The change in swimming behavior of fish has not been fully understood, neither how it changes with increased swimming velocity. The change in flexibility or stiffness is addressed for sub-Carangi form type of fish and results graphically illustrated. Orkusjóður
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