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Fig. 3. Data from locomotory gait and behaviour experiments. (A) The relationship
between mean swimming speed (determined from videotapes) and water velocity
for 30 cm smallmouth bass in the raceway, and the locomotory gaits used by
individuals to attain various speeds. Similar patterns existed for other size
groups (24–38 cm). (B) The relationship between fork length and maximum
steady (solid line, y=3.9+2.3x, r2=0.65) and
minimum unsteady (broken line, y=46.2+1.8x,
r2=0.55) gait thresholds for smallmouth bass in the raceway.
(C) Mean ground speeds calculated from videotapes, the light-gate interval
that spanned the observation window and the light-gate data from the entire
raceway for smallmouth bass that were observed using steady, mixed or unsteady
locomotion. Significant differences within gaits are indicated by differing
lowercase letters. (D) Mean ground speeds (vertical bars) and passage times
(black circles) for smallmouth bass relative to water velocities in the
raceway. Dark, intermediate and light sections within each vertical bar
indicate the relative proportions (0–100%) of fish that swam at mean
speeds that fell within the steady, transitional and unsteady zones.
Significant differences in mean ground speed and passage time are indicated by
differing lowercase and uppercase letters, respectively. Error bars in all
figures indicate S.E.M.
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