. 2020 Dec 14;7:602587. doi: 10.3389/fmolb.2020.602587

Table 2.

Lipid and fatty acid composition (%) of Atlantic salmon head kidney^a before (Initial) and after 12 weeks of feeding diets with different ratios of ω6:ω3 and levels of EPA+DHA.

	Initial	0.3% EPA+DHA	0.3% EPA+DHA	1% EPA+DHA	1% EPA+DHA	1.4% EPA+DHA
		↑ω6	↑ω3	↑ω6	↑ω3	Balanced
Lipid classes composition (% of total lipid)
TAG (%)^b	38.9 ± 18.7	46.6 ± 12.5	48.5 ± 12.8	47.8 ± 9.8	47.0 ± 15.9	52.0 ± 14.7
ST (%)^c	36.7 ± 15.2	23.7 ± 6.9	20.5 ± 7.2	23.5 ± 6.0	21.8 ± 6.8	18.4 ± 6.8
PL (%)^d	23.5 ± 11.4	27.2 ± 14.1	28.6 ± 11.2	22.8 ± 9.1	28.2 ± 12.3	25.4 ± 11.0
TL (mg g⁻¹)^e	32.1 ± 12.0	26.9 ± 7.2	33.8 ± 9.0	31.9 ± 8.3	35.1 ± 14.7	36.2 ± 13.4
Fatty acid composition (% of total FA)
14:0	2.4 ± 0.5	0.9 ± 0.4^a	1.1 ± 0.3^a	1.4 ± 0.3^a ^b	1.7 ± 0.8^b ^c	2.1 ± 0.9^c
16:0	15.4 ± 2.0	14.9 ± 1.2	14.1 ± 0.8	15.6 ± 3.2	14.9 ± 3.7	14.8 ± 2.7
16:1ω7	5.6 ± 1.0	2.1 ± 0.8^a	2.9 ± 0.5^b ^c	2.4 ± 0.8^a ^b	3.1 ± 1.0^b ^c	3.4 ± 0.9^c
18:0	5.0 ± 0.7	5.6 ± 1.0^a	5.2 ± 0.4^a ^b	5.7 ± 1.9^a	4.9 ± 0.5^a ^b	4.4 ± 0.3^b
18:1ω9	31.5 ± 4.7	20.7 ± 3.1^a	24.8 ± 2.3^b ^c	20.0 ± 2.9^a	22.6 ± 2.5^a ^b	25.7 ± 2.5^c
18:1ω7	3.4 ± 0.4	2.2 ± 0.2^a	2.3 ± 0.1^a ^b	2.4 ± 0.3^a ^b	2.4 ± 0.2^b	3.0 ± 0.1^c
18:2ω6 (LNA)	10.1 ± 1.1	19.3 ± 3.1^a	11.6 ± 1.2^c	16.3 ± 3.6^b	10.5 ± 1.4^c	9.7 ± 1.0^c
18:3ω6	0.3 ± 0.1	0.9 ± 0.2^a	0.5 ± 0.1^b	0.5 ± 0.1^b	0.3 ± 0.1^c	0.3 ± 0.1^c
18:3ω3 (ALA)	1.1 ± 0.3	1.9 ± 0.4^a	6.5 ± 1.2^b	1.7 ± 0.5^a	6.3 ± 1.5^b	1.7 ± 0.3^a
18:4ω3	0.6 ± 0.2	0.7 ± 0.2^a	1.8 ± 0.4^c	0.7 ± 0.2^a	1.5 ± 0.3^b	0.9 ± 0.2^a
20:1ω11	0.5 ± 0.1	0.2 ± 0.1^a	0.2 ± 0.3^a	1.0 ± 0.3^b	0.9 ± 0.3^b	1.5 ± 0.4^c
20:1ω9	2.9 ± 0.5	1.2 ± 0.4^a	1.4 ± 0.2^a ^b	1.6 ± 0.3^b	1.6 ± 0.5^b	2.1 ± 0.4^c
20:2ω6	0.6 ± 0.1	1.4 ± 0.3^a	0.7 ± 0.1^b	1.2 ± 0.4^a	0.6 ± 0.2^b	0.8 ± 0.1^b
20:3ω6 (DGLA)	0.4 ± 0.1	2.6 ± 0.7^a	1.0 ± 0.2^c	1.5 ± 0.5^b	0.7 ± 0.2^d	0.7 ± 0.1^c ^d
20:4ω6 (ARA)	1.2 ± 0.8	4.3 ± 1.7^a	2.5 ± 0.6^b	2.4 ± 0.8^b	2.0 ± 0.7^b	1.9 ± 0.6^b
20:3ω3	0.1 ± 0.04	0.1 ± 0.03^a	0.4 ± 0.1^b	0.2 ± 0.03^a	0.4 ± 0.1^b	0.2 ± 0.02^a
20:4ω3	0.4 ± 0.2	0.4 ± 0.1^a	1.0 ± 0.2^c	0.6 ± 0.1^a ^b	0.9 ± 0.3^c	0.7 ± 0.2^b
20:5ω3 (EPA)	2.9 ± 1.7	2.6 ± 0.6^a	3.7 ± 0.7^b	3.8 ± 1.2^b	4.4 ± 1.3^b	4.3 ± 1.1^b
22:1ω11	2.4 ± 0.4	0.7 ± 0.3^a	0.8 ± 0.3^a	1.4 ± 0.3^b	1.4 ± 0.5^b	1.8 ± 0.5^c
22:4ω6	0.1 ± 0.05	0.2 ± 0.1^a	0.1 ± 0.01^b	0.2 ± 0.1^a ^b	0.1 ± 0.1^b	0.2 ± 0.2^a ^b
22:5ω6 (ω6 DPA)	0.1 ± 0.1	0.4 ± 0.1^a	0.2 ± 0.05^b	0.2 ± 0.04^b	0.2 ± 0.05^b	0.2 ± 0.04^b
22:5ω3 (ω3 DPA)	1.0 ± 0.5	0.8 ± 0.3^a	1.0 ± 0.1^a ^b ^c	1.0 ± 0.4^a ^b	1.1 ± 0.4^b ^c	1.3 ± 0.4^c
22:6ω3 (DHA)	6.8 ± 4.3	12.4 ± 2.9	12.8 ± 3.0	13.5 ± 3.4	13.6 ± 3.8	14.0 ± 3.8
ΣSFA^f	23.8 ± 2.9	22.3 ± 2.2	21.2 ± 1.0	23.8 ± 5.6	22.4 ± 4.9	22.2 ± 3.7
ΣMUFA^g	48.5 ± 6.9	28.3 ± 4.7^a	33.8 ± 3.0^a ^b	30.7 ± 4.5^a ^b	33.7 ± 3.6^b	39.3 ± 3.7^c
ΣPUFA^h	27.3 ± 8.8	49.0 ± 4.5^a	44.6 ± 2.4^a ^b	45.1 ± 8.3^a ^b	43.6 ± 5.0^b	38.1 ± 4.3^c
Σω3	13.1 ± 7.2	19.1 ± 3.0^a	27.4 ± 2.9^c	21.7 ± 5.0^a ^b	28.5 ± 4.8^c	23.4 ± 4.4^b
Σω6	12.9 ± 1.9	28.9 ± 3.4^a	16.4 ± 0.8^c	22.1 ± 4.6^b	14.3 ± 1.2^c ^d	13.6 ± 0.5^d
ω6:ω3	1.2 ± 0.7	1.5 ± 0.3^a	0.6 ± 0.1^c	1.0 ± 0.2^b	0.5 ± 0.1^c	0.6 ± 0.1^c
EPA+DHA	9.7 ± 6.0	15.0 ± 3.3	16.5 ± 3.4	17.3 ± 4.4	18.0 ± 4.8	18.3 ± 4.6
DHA:EPA	2.4 ± 0.2	4.9 ± 1.1^a	3.4 ± 0.6^b	3.7 ± 0.7^b	3.2 ± 0.7^b	3.3 ± 0.5^b
EPA:ARA	2.4 ± 0.6	0.7 ± 0.3^a	1.6 ± 0.3^b	1.6 ± 0.3^b	2.2 ± 0.4^c	2.3 ± 0.5^c

Mean (n = 10–20) ± standard deviation (SD). Different superscripts in the same row indicate significant differences among treatments at week 12. Underlining indicates values that are significantly different to week 0 (Initial) (p < 0.05).

Triacylglycerol.

Sterols.

Phospholipids.

Total lipids.

Total saturated fatty acids.

Total monounsaturated fatty acids.

Total polyunsaturated fatty acids.