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

Jung-Schroers, Verena; Hildebrandt, Uta; Retter, Karina; Esser, Karl-Heinz; Hellmann, John; Kleingeld, Dirk Willem; Rohn, Karl; Steinhagen, Dieter

doi:10.1186/s12917-020-02412-5

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

Current	Frequency [Hz]	Duration [sec]	Electrode position	Cortisol [ng ml⁻¹]	Haematocrit [%]	Potassium [mmol l⁻¹]	Sodium [mmol l⁻¹]
DC		30	Head/ Tail	18.6 ± 14.78	43.2 ± 4.10	4.4 ± 0.95	167.0 ± 6.22
			Top/Bottom	21.7 ± 20.18	41.0 ± 8.82	5.7 ± 0.88	160.0 ± 5.06
			Lateral	29.5 ± 31.08	45.8 ± 9.75	4.6 ± 0.50	152.0 ± 18.43
		60	Head/ Tail	17.9 ± 14.26	42.8 ± 6.20	4.6 ± 0.58	163.0 ± 5.30
			Top/Bottom	74.6 ± 54.26	49.0 ± 7.21	5.2 ± 0.58	166.0 ± 6.94
			Lateral	41.4 ± 51.22	37.9 ± 12.39	5.2 ± 1.12	159.0 ± 8.00
AC	50	30	Head/ Tail	42.0 ± 15.56	43.4 ± 3.46	3.7 ± 1.11	163.0 ± 7.11
			Top/Bottom	54.0 ± 29.69	48.5 ± 5.24	5.4 ± 1.08	164.0 ± 6.39
			Lateral	38.0 ± 20.51	39.9 ± 4.42	4.4 ± 0.85	162.0 ± 2.75
		60	Head/ Tail	57.0 ± 25.53	47.8 ± 4.62	4.6 ± 1.04	157.0 ± 8.72
			Top/Bottom	82.0 ± 62.44	42.9 ± 5.11	4.3 ± 0.53	156.0 ± 3.68
			Lateral	73.0 ± 60.90	47.1 ± 4.32	4.2 ± 0.52	150.0 ± 15.83
	100	30	Head/ Tail	74.0 ± 31.13	44.6 ± 3.36	6.2 ± 2.21	167.0 ± 7.69
			Top/Bottom	41.0 ± 38.77	44.3 ± 2.71	4.3 ± 0.63	168.0 ± 5.95
			Lateral	59.0 ± 24.11	39.5 ± 3.89	4.8 ± 1.51	158.0 ± 10.03
		60	Head/ Tail	68.0 ± 36.0	39.5 ± 4.57	4.4 ± 0.68	165.0 ± 1.77
			Top/Bottom	50.0 ± 25.55	42.9 ± 3.72	4.3 ± 0.94	164.0 ± 5.31
			Lateral	24.0 ± 18.53	39.0 ± 6.74	5.1 ± 1.26	158.0 ± 3.54
	1000	30	Head/ Tail	51.0 ± 3878	48.3 ± 10.00	3.5 ± 2.01	160.0 ± 16.22
			Top/Bottom	60.0 ± 44.11	40.1 ± 3.83	4.0 ± 1.40	1620 ± 5.51
			Lateral	40.0 ± 23.25	45.3 ± 4.43	3.0 ± 0.48	163.0 ± 5.42
		60	Head/ Tail	37.0 ± 24.96	41.9 ± 5.08	3.4 ± 0.60	167.0 ± 3.07
			Top/Bottom	65.0 ± 57.09	43.0 ± 4.34	2.6 ± 0.61	167.0 ± 4.93
			Lateral	37.0 ± 25.53	39.9 ± 4.82	5.3 ± 1.62	164.0 ± 3.72

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
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

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