<p>Simulated average velocity along the main flow vector () (continues orange and green lines) and average (dotted orange and green line) from 3D and 2D HN simulations in the observation section 3, measured average velocities by ADV (blue triangles) and LDV (green squares).</p>

<p>Colored bars specify the four hydraulic zones (after [<a href="plosone.org/article/info:doi/10.1371/journal.pone.0348737#pone.0348737.ref045" target="_blank">45</a>]), Approach zone:- < 0.2 ; <; zone: > 0.2 ; <; Mixed zone: > 0.2 ; ≥ ; High velocity zone: < 0.2 ; ≥ ; *gradual transition between the SVG and mixed zone due to the length dependent variation of the theoretical sprint swimming speed of each fish.

The x-axis denotes the streamwise position along the experimental flume measured from the start of section 1 of the flume; the observation area analyzed here corresponds to 12.5 < x < 22, thus section 3, the observation area (see <a href="plosone.org/article/info:doi/10.1371/journal.pone.0348737#pone.0348737.g001" target="_blank">Fig 1</a>).</p>