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Table 1 Size frequency (%) of the prey consumed by trout

From: Adaptive flexibility in the feeding behaviour of brown trout: optimal prey size

  Size class (mm)
  0 to 2 2 to 4 4 to 6 6 to 8 8 to 10 10 to 12 12 to 14 14 to 16 16 to 18 18 to 20 >20
Anllóns            
 0+ (n = 2) 0 10.8 27.0 2.7 13.5 45.9 0 0 0 0 0
 1+ (n = 18) 1.3 18.4 23.7 3.0 27.3 24.7 0 0.3 0 0.7 0.7
 2+ (n = 9) 0.4 18.9 56.9 1.3 4.7 17.0 0 0.2 0 0 0.6
 3+ (n = 6) 0 15.1 52.8 15.1 1.9 11.3 1.9 1.9 0 0 0
 Pooled data 0.7 18.2 43.7 2.8 12.8 20.6 0.1 0.3 0 0.2 0.6
Furelos            
 0+ (n = 37) 2.1 3.2 33.5 0 1.9 51.0 0 6.5 0 0 1.8
 1+ (n = 19) 1.4 4.8 81.0 0.1 0.2 6.0 0 3.9 0 0 2.6
 2+ (n = 5) 0.5 2.8 54.1 0 8.7 4.1 0 8.7 0 0 21.1
 3+ (n = 3) 3.2 18.5 15.3 0.8 0 33.1 0 0 0 0 29.0
 Pooled data 1.6 4.8 60.7 0.1 1.5 20.9 0 4.9 0 0 5.4
Lengüelle            
 0+ (n = 6) 0 2.4 62.9 0 13.7 19.4 0 0.8 0 0 0.8
 1+ (n = 13) 0 18.3 37.7 0.4 16.5 20.4 0 0 0 0 6.7
 2+ (n = 16) 0.8 7.9 53.1 0.8 4.3 24.1 0 0.2 0 0 8.7
 3+ (n = 4) 5.8 1.9 32.7 0 9.6 38.5 0 0 0 0 11.5
 Pooled data 0.7 10.0 48.7 0.5 9.4 23.2 0 0.2 0 0 7.2
Tambre            
 1+ (n = 24) 1.6 12.6 59.6 0.7 6.7 17.0 0 0.9 0 0 0.8
 2+ (n = 6) 0.3 5.2 56.0 0.9 4.0 28.4 0 2.4 0 0 2.8
 Pooled data 1.4 11.2 58.9 0.8 6.2 19.2 0 1.2 0 0 1.2
Rois            
 1+ (n = 31) 2.7 7.7 33.8 3.2 14.3 33.9 0 2.7 0 0.2 1.4
 2+ (n = 2) 2.0 6.0 28.0 6.0 4.0 46.0 0 2.0 0 0 6.0
 Pooled data 2.7 7.6 33.6 3.4 13.8 34.5 0 2.7 0 0.2 1.6
Santa Lucía            
 1+ (n = 24) 2.2 29.4 34.7 7.0 5.0 7.9 0 8.0 0.3 2.3 3.4
 2+ (n = 5) 3.2 20.6 40.2 10.6 4.2 15.3 0 4.8 0 0.5 0.5
 Pooled data 2.4 27.7 35.8 7.7 4.8 9.3 0 7.4 0.2 1.9 2.9
Sar            
 1+ (n = 25) 0.6 33.8 4.0 0.9 1.1 57.8 0 0.2 0 0.1 1.6
 2+ (n = 4) 1.0 17.7 3.0 0.5 3.4 70.4 0 1.5 0 0 2.5
 Pooled data 0.6 32.2 3.9 0.9 1.3 59.0 0 0.3 0 0.05 1.7
Traba            
 1+ (n = 15) 0.3 4.8 45.5 0.4 14.8 33.8 0 0.2 0 0 0.1
 2+ (n = 14) 0.5 7.6 51.5 1.0 10.7 28.1 0 0.2 0 0 0.2
 Pooled data 0.4 5.7 47.6 0.6 13.4 31.8 0 0.2 0 0 0.2
Total (n = 288) 3.44 5.00 44.44 3.42 8.27 31.97 0.01 1.30 0.03 0.17 1.97
  1. Data are displayed for each sampling site, each age class and in total using pooled data. Prey were grouped into 2-mm-length classes. The sample size (n) of each age class is shown in brackets.