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Table 4 Morphological data from historic walleye andblue pike” samples, with mean, standard deviation (SD), and range of values

From: A population genetic window into the past and future of the walleye Sander vitreus: relation to historic walleye and the extinct “blue pike” S. v. “glaucus”

  Historic walleye (N = 51) “Blue pike” (N = 52)
Measurement Mean ± SD Range Mean ± SD Range
Standard length (mm) 264.3 ± 49.9 187 - 385 248.8 ± 37.7 202 - 362
% Standard length     
Body depth 20.1 ± 1.9 15.8 - 24.2 20.4 ± 2.1 16.3 - 24.9
Head length 30.7 ± 0.8 28.9 - 32.2 30.6 ± 1.8 27.9 - 40.7
% Head length     
Cheek length 48.3 ± 1.8 44.3 - 52.5 48.4 ± 1.6 46.3 - 55.7
Upper jaw length 38.6 ± 3.1 33.6 - 43.9 37.9 ± 3.7 31.0 - 44.9
Lower jaw length 38.8 ± 4.1 30.1 - 43.7 38.2 ± 4.3 31.6 - 44.1
Head width 41.6 ± 4.5 34.3 - 55.0 38.6 ± 2.5 32.1 - 44.0**
Interorbital width 14.9 ± 1.1 12.8 - 17.3 14.1 ± 1.2 11.2 - 17.2**
Orbit diameter 20.7 ± 1.8 17.4 - 26.4 21.9 ± 2.1 16.6 - 25.9**
Orbit: interorbital 1.4 ± 0.2 1.1 - 2.0 1.6 ± 0.2 1.0 - 2.2**
Upper: lower jaw 1.0 ± 0.2 0.8 - 1.3 1.0 ± 0.2 0.7 - 1.3
Meristic Mode Range Mode Range
First dorsal fin rays 14 11 - 16 12 11 - 15
Second dorsal fin rays 21 19 - 22 20 13 - 22**
Pectoral fin rays 15 11 - 17 14 10 - 16
Pelvic fin rays 6 5 - 8 7 5 - 8**
Anal fin rays 14 11 - 16 14 11–16
  1. Body and head measurements are given as percentage of standard or head lengths, respectively. Ratios are between the original measurement values.
  2. Additional file 11 lists individuals examined. ** = statistically significant comparisons between walleye and “blue pike” using Student’s t and Mann Whitney U tests. Overall, walleye and “blue pike”differed according to the nonparametric MANOVA (morphometric: F = 4.34, degrees of freedom (df) = 1, p < 0.001; meristic: F = 4.13, df = 1, p = 0.001).