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Table 1.

Summary statistics of cylinder wake variables and trout kinematic variables for five experimental treatments

VariablesmD2.5smD4.5laD4.5FSBW
Vortex shedding frequency (Hz) 2.24±0.01 4.02±0.02 2.22±0.01 
Tail-beat frequency (Hz) 2.10±0.04 3.71±0.05 2.18±0.05* 6.62±0.11 4.34±0.24 
Cylinder wake wavelength (L1.12±0.01 1.12±0.01 2.03±0.01 
Body wavelength (L1.57±0.04 1.50±0.03 4.05±0.22 1.15±0.02 1.21±0.03 
Snout amplitude (L0.02±0.01 0.02±0.01 0.16±0.02 0.02±0.01 0.02±0.01 
COM amplitude (L0.01±0.01 0.02±0.01 0.15±0.01 0.02±0.01 0.01±0.01 
50% L amplitude (L0.05±0.01 0.05±0.01 0.17±0.01 0.02±0.01 0.02±0.01 
Tail-beat amplitude (L0.14±0.01 0.16±0.01 0.32±0.02 0.11±0.01 0.09±0.01 
Max. body curvature (1/L1.60±0.06 1.83±0.06 2.09±0.09 1.71±0.06 1.16±0.09 
Location of max. curvature (L0.74±0.01 0.74±0.01 0.71±0.01 0.76±0.01 0.78±0.01 
Distance downstream from cylinder (L1.68±0.03 1.77±0.05 1.92±0.05 
Maximum head angle (degrees) 16.53±0.54 14.74±0.49 16.76±0.96 12.96±0.40 10.46±0.65 
Slip 0.77±0.02 0.82±0.01 0.55±0.02 0.60±0.01 0.93±0.06 
Strouhal number 0.24±0.01 0.26±0.01 0.31±0.01 0.32±0.01 0.17±0.01 
VariablesmD2.5smD4.5laD4.5FSBW
Vortex shedding frequency (Hz) 2.24±0.01 4.02±0.02 2.22±0.01 
Tail-beat frequency (Hz) 2.10±0.04 3.71±0.05 2.18±0.05* 6.62±0.11 4.34±0.24 
Cylinder wake wavelength (L1.12±0.01 1.12±0.01 2.03±0.01 
Body wavelength (L1.57±0.04 1.50±0.03 4.05±0.22 1.15±0.02 1.21±0.03 
Snout amplitude (L0.02±0.01 0.02±0.01 0.16±0.02 0.02±0.01 0.02±0.01 
COM amplitude (L0.01±0.01 0.02±0.01 0.15±0.01 0.02±0.01 0.01±0.01 
50% L amplitude (L0.05±0.01 0.05±0.01 0.17±0.01 0.02±0.01 0.02±0.01 
Tail-beat amplitude (L0.14±0.01 0.16±0.01 0.32±0.02 0.11±0.01 0.09±0.01 
Max. body curvature (1/L1.60±0.06 1.83±0.06 2.09±0.09 1.71±0.06 1.16±0.09 
Location of max. curvature (L0.74±0.01 0.74±0.01 0.71±0.01 0.76±0.01 0.78±0.01 
Distance downstream from cylinder (L1.68±0.03 1.77±0.05 1.92±0.05 
Maximum head angle (degrees) 16.53±0.54 14.74±0.49 16.76±0.96 12.96±0.40 10.46±0.65 
Slip 0.77±0.02 0.82±0.01 0.55±0.02 0.60±0.01 0.93±0.06 
Strouhal number 0.24±0.01 0.26±0.01 0.31±0.01 0.32±0.01 0.17±0.01 

Values are means ± S.E.M. (N=8 for all treatments except for BW, N=5).

L, total body length.

Treatments: smD2.5, 2.5 cm diameter cylinder at 2.5 Ls-1; smD4.5, 2.5 cm diameter cylinder at 4.5 Ls-1; laD4.5, 5 cm diameter cylinder at 4.5 Ls-1; FS, free stream at 4.5 L s-1; BW, bar wake of 5 cm diameter cylinder at 4.5 L s-1.

*

Not significantly different from the corresponding vortex shedding frequency (P=0.48).

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