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Fig. 3. Take-off speed is rapidly gained at the end of the turning phase and is
changed only very slightly in the immediately subsequent translatory phase.
For each of the N=90 responses, speed measurements
v1, v2, v3 were
derived from changes in position during the first, second and third 20 ms
interval, respectively, of the fish's initial translatory motion. The
histograms show the distribution of speed differences between subsequent
intervals. Distribution of (A) speed changes
v2-v1, (B)
v3-v2. Both distributions are
systematically shifted towards positive values, but the shifts (0.05 m
s-1 and 0.07 m s-1, respectively, both
P<0.01; t-test) are small compared to the basis speed
level of about 1 m s-1 acquired during the final phase of the turn.
Speed differences in A and B are sampled in intervals of 0.1 m s-1
and accumulated into histograms normalized so that total frequency is 1, ticks
on ordinate indicate 10% frequency.
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