Algal and Vegetable Oils as Sustainable Fish Oil Substitutes in Rainbow Trout Diets: An Approach to Reduce Contaminant Exposure

Table 5

Effects of feeding with a washout diet of herring oil on fillet composition (g/kg DM) and fatty acid profile (% of total fatty acids).

	18 FO	18 SO	18 CO	18 COS	25 FO	25 SO	25 CO	25 COS	Pooled SEM
Fatty acid
14 : 0	4.4^a	3.1^b	3.3^b	3.3^b	3.4^a,b	2.8^b	2.8^b	3.0^b	0.1
16 : 0	17.1	17.5	16.6	15.8	18.0	19.7	18.5	19.3	0.4
18 : 0	3.1^c	4.1^a,b	3.5^b,c	3.2^c	3.7^b,c	4.8^a	4.3^a,b	4.3^a,b	0.1
Total SFA^1	24.6	24.7	23.4	22.3	25.2	27.3	25.6	26.6	0.5
16 : 1	6.1^a	3.7^b,c	4.3^a,b,c	3.0^c	5.0^a,b	4.1^b,c	4.2^b,c	3.9^b,c	0.3
18 : 1	18.4^c	20.0^c	30.6^a,b	27.8^a,b,c	26.8^a,b,c	21.8^b,c	31.8^a	26.1^a,b,c	1.3
20 : 1	11.5^a	6.7^b,c	7.7^b	6.4^b,c	7.5^b	5.2^c	5.4^c	5.2^c	0.5
22 : 1	15.1^a	8.5^b	9.2^b	7.8^b,c	8.7^b	5.7^c,d	5.3^c,d	5.2^d	0.7
24 : 1	1.9	0.8	1.1	0.0	0.8	0.0	0.0	0.0	0.2
Total MUFA	53.0^a	36.9^c,d	53.0^a	44.9^a,b,c,d	48.8^a,b	36.8^d	46.7^a,b,c	40.5^b,c,d	1.3
18 : 2n-6	5.5^b	18.2^a	8.0^b	8.9^b	7.6^b	17.2^a	9.7^b	8.1^b	1.0
20 : 2n-6	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
20 : 3n-6	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
20 : 4n-6	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
22 : 5n-6	0.0^b	0.0^b	0.0^b	2.2^a	0.0^b	0.0^b	0.0^b	2.1^a	0.2
Total n-6^2	5.5^d	18.2^a	8.0^c,d	11.1^b,c	7.6^c,d	17.2^a,b	9.7^c,d	10.2^c.d	1.0
18 : 3n-3	0.0	2.2	1.3	2.0	1.0	1.9	1.2	0.0	0.2
20 : 5n-3	2.3	2.1	2.4	1.7	2.5	2.2	2.1	2.5	0.1
22 : 6n-3	14.6	13.1	15.4	18.0	14.9	14.6	14.7	20.2	0.6
Total n-3	16.8	17.3	19.1	21.7	18.4	18.7	18.0	22.7	0.6
Total PUFA	22.4^c	35.6^a	27.2^b,c	32.8^a,b	26.0^b,c	35.9^a	27.7^b,c	32.9^a,b	1.1
n-3/n-6	3.0^a	1.0^b	2.4^a,b	2.0^a,b	2.4^a,b	1.1^b	1.8^a,b	2.2^a,b	0.2
Chemical composition
Dry matter (g/kg)	26.6	26.1	25.6	26.1	25.2	25.5	25.5	25.0	0.1
Crude protein	88.0	87.7	90.2	92.8	89.3	90.4	90.1	93.0	0.6
Total lipid	12.0	10.5	9.3	10.1	8.8	8.0	8.8	6.2	0.5
Ash	5.8	5.5	5.3	5.6	5.3	5.7	5.2	5.6	0.1
Gross energy (MJ/kg DM)	24.4	23.7	23.9	23.9	23.6	23.6	23.6	23.3	0.1

Data represent the mean ± standard error means of duplicates replicates. Within the same line, different superscripts indicate significant differences (). ¹Includes 15 : 0, 17 : 0, 20 : 0, and 22 : 0. ²Includes 18 : 3n-6.