Fig. 3

Behaviour spectrum calculated using a Morelet wavelet transformation based on Sakamoto et al. [50] approach for shortnose sturgeon of length a 0.83 m, b 0.90 m, c 0.92 m, d 0.96 m and e 1.09 m. The tail beat frequency cycles are in seconds, and the colour shows the amplitude of the frequency for every second for each fish