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Fig. 4. (AC) Velocity and vorticity values for one trial with
Lepomis (A), one trial with Colomesus (B) and one with
Thysochromis (C) as function of time (60 s). Maximum velocity in the
field of view (top), mean velocity in the field of view (middle) and maximum
vorticity in the field of view (bottom) are shown. Different colours refer to
different layers (black, layer 1 = uppermost layer; red, layer 2; green, layer
3; blue, layer 4; cyan, layer 5; magenta, layer 6 = lowermost layer.