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Table 4 Physiological parameters in blood of rainbow trout after stunning with different types of electric current

From: Is humane slaughtering of rainbow trout achieved in conventional production chains in Germany? Results of a pilot field and laboratory study

CurrentFrequency [Hz]Duration [sec]Electrode positionCortisol [ng ml−1]Haematocrit [%]Potassium [mmol l−1]Sodium [mmol l−1]
DC 30Head/ Tail18.6 ± 14.7843.2 ± 4.104.4 ± 0.95167.0 ± 6.22
  Top/Bottom21.7 ± 20.1841.0 ± 8.825.7 ± 0.88160.0 ± 5.06
  Lateral29.5 ± 31.0845.8 ± 9.754.6 ± 0.50152.0 ± 18.43
 60Head/ Tail17.9 ± 14.2642.8 ± 6.204.6 ± 0.58163.0 ± 5.30
  Top/Bottom74.6 ± 54.2649.0 ± 7.215.2 ± 0.58166.0 ± 6.94
  Lateral41.4 ± 51.2237.9 ± 12.395.2 ± 1.12159.0 ± 8.00
AC5030Head/ Tail42.0 ± 15.5643.4 ± 3.463.7 ± 1.11163.0 ± 7.11
  Top/Bottom54.0 ± 29.6948.5 ± 5.245.4 ± 1.08164.0 ± 6.39
  Lateral38.0 ± 20.5139.9 ± 4.424.4 ± 0.85162.0 ± 2.75
 60Head/ Tail57.0 ± 25.5347.8 ± 4.624.6 ± 1.04157.0 ± 8.72
  Top/Bottom82.0 ± 62.4442.9 ± 5.114.3 ± 0.53156.0 ± 3.68
  Lateral73.0 ± 60.9047.1 ± 4.324.2 ± 0.52150.0 ± 15.83
10030Head/ Tail74.0 ± 31.1344.6 ± 3.366.2 ± 2.21167.0 ± 7.69
  Top/Bottom41.0 ± 38.7744.3 ± 2.714.3 ± 0.63168.0 ± 5.95
  Lateral59.0 ± 24.1139.5 ± 3.894.8 ± 1.51158.0 ± 10.03
 60Head/ Tail68.0 ± 36.039.5 ± 4.574.4 ± 0.68165.0 ± 1.77
  Top/Bottom50.0 ± 25.5542.9 ± 3.724.3 ± 0.94164.0 ± 5.31
  Lateral24.0 ± 18.5339.0 ± 6.745.1 ± 1.26158.0 ± 3.54
100030Head/ Tail51.0 ± 387848.3 ± 10.003.5 ± 2.01160.0 ± 16.22
  Top/Bottom60.0 ± 44.1140.1 ± 3.834.0 ± 1.401620 ± 5.51
  Lateral40.0 ± 23.2545.3 ± 4.433.0 ± 0.48163.0 ± 5.42
 60Head/ Tail37.0 ± 24.9641.9 ± 5.083.4 ± 0.60167.0 ± 3.07
  Top/Bottom65.0 ± 57.0943.0 ± 4.342.6 ± 0.61167.0 ± 4.93
  Lateral37.0 ± 25.5339.9 ± 4.825.3 ± 1.62164.0 ± 3.72
  1. Shown are mean ± standard deviation of n = 10–12 specimens per treatment. Electrode position: plate electrodes positioned at head and tail, top and bottom; or lateral: at lateral sides of stunned rainbow trout
  2. Statistical analysis: Kruskal Wallis ANOVA on ranks followed by Dunn’s post hoc test. Cortisol, haematocrit, sodium: no differences at p < 0.05. Potassium: AC 1000 HZ, lateral 30 s and1000 Hz top/bottom 60 were significantly different to the other groups at p < 0.05