Optical measurement of tissue perfusion changes as an alternative to electrocardiography for heart rate monitoring in Atlantic salmon (Salmo salar)

Table 2 Results sorted by average SQI where the columns named Fish is the fish number, Or. is the orientation, Rot. is the rotation, HR_ECG is the heart rate in BPM calculated from ECG, HR₆₆₀ is the calculated heart rate in BPM for the 660 nm time series, HR₈₈₀ is the calculated heart rate in BPM for the 880 nm time series, ∆HR₆₆₀ is the difference in HR estimate between the 660 nm time series and ECG in percent, ∆HR₈₈₀ is the difference in HR estimate between the 880 nm time series and ECG in percent, SQI₆₆₀ is the SQI for 660 nm, SQ I₈₈₀ is the SQI for 880 nm and SQI_avg is the average SQI, respectively

Fish	Or.	Rot.	HR_ECG	HR₆₆₀	HR₈₈₀	∆HR₆₆₀	∆HR₈₈₀	SQI₆₆₀	SQI₈₈₀	SQI_avg	Likely tissues
5	Ver	270	50.4	50.2	50.4	0.40	0.00	0.03	0.02	0.02	M, F
3	Hor 2	0	53.1	53.3	53.3	0.38	0.38	0.04	0.05	0.05	F
5	Hor	270	50.6	50.4	50.6	0.40	0.00	0.02	0.08	0.05	M, F
5	Hor 1	0	35.9	N/A	35.2	N/A	1.95	N/A	0.08	0.08	F
5	Hor	180	46.0	N/A	46.0	N/A	0.00	N/A	0.10	0.10	F, I
2	Ver	270	43.0	42.7	42.4	0.70	1.40	0.16	0.14	0.15	M, F
5	Ver 1	0	49.0	48.6	48.2	0.82	1.63	0.28	0.06	0.17	L, G
3	Hor	90	41.1	N/A	40.7	N/A	0.97	N/A	0.18	0.18	M, F
3	Hor 1	0	41.1	N/A	40.7	N/A	0.97	N/A	0.18	0.18	F
3	Hor	180	41.7	41.2	41.0	1.20	1.68	0.21	0.21	0.21	F, I
6	Ver	90	27.5	27.3	26.8	0.73	2.55	0.36	0.17	0.26	M, F
3	Hor	270	42.9	42.9	43.5	0.00	1.40	0.48	0.24	0.36	M, F
5	Ver 2	0	52.6	52.6	52.6	0.00	0.00	0.48	0.25	0.36	L, G
4	Ver	270	37.7	37.7	37.9	0.00	0.53	0.81	0.51	0.66	M, F
2	Ver	90	35.0	35.1	35.2	0.29	0.57	0.95	0.74	0.84	M, F
6	Ver	270	36.0	35.8	35.7	0.56	0.83	1.51	0.55	1.03	M, F
2	Ver 2	0	48.6	48.8	48.8	0.41	0.41	0.87	1.59	1.23	L, G
1	Ver	270	18.0	18.2	18.2	1.11	1.11	2.35	0.63	1.49	M, F
1	Ver	90	13.9	13.8	13.8	0.72	0.72	1.95	1.24	1.60	M, F
1	Ver	180	19.0	18.9	18.9	0.53	0.53	2.55	0.69	1.62	G, F
6	Ver 2	0	33.6	33.6	33.6	0.00	0.00	3.27	0.66	1.96	L, G
2	Ver 1	0	32.8	32.0	32.0	2.44	2.44	2.66	1.84	2.25	L, G
4	Ver 2	0	70.2	70.2	70.2	0.00	0.00	2.96	1.61	2.28	L, G
3	Ver 1	0	59.4	59.4	59.4	0.00	0.00	3.75	1.32	2.54	L, G
4	Ver 1	0	32.4	30.7	31.3	5.25	3.40	4.69	1.38	3.04	L, G
1	Ver 1	0	19.4	19.3	19.3	0.52	0.52	13.2	2.90	8.05	L, G
1	Ver 2	0	26.7	26.5	26.5	0.75	0.75	14.59	6.20	10.40	L, G
4	Ver	90	37.2	37.6	39.2	1.08	5.38	24.68	7.92	16.30	M, F

The table entry “N/A” (Not Applicable) is for the cases where no valid data could be identified for the respective wavelength in a particular data set. Entries in the Likely tissues column are: M: Muscle, F: Fat, I: Intestines, L: Liver and G: Gut, and denote tissues likely present in the sensing volume for the associated sensor orientation and rotation

ISSN: 2050-3385