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

Table 3

Effect of fish oil replacement with soybean oil, canola oil, and a blend of canola oil and Schizochytrium sp. biomass on rainbow trout growth, nutritive utilization, and somatic parameters after growth trial.

	18 FO	18 SO	18 CO	18 COS	25 FO	25 SO	25 CO	25 COS	Pooled SEM
Initial weight (g)	43.6	44.1	44.0	43.2	44.0	43.3	43.2	43.7	0.2
Final weight (g)	611.7	591.7	570.2	583.0	591.0	572.3	535.7	574.1	6.5
Weight gain (g)	568.1	547.6	526.2	539.7	547.0	529.1	492.5	530.4	6.4
TGC	0.23	0.23	0.22	0.23	0.23	0.22	0.21	0.22	0.00
FCR	1.19^a	1.06^b,c,d	1.14^a,b	1.09^b,c	1.07^b,c,d	1.02^c,d	1.05^b,c,d	0.98^d	0.01
CF	1.61	1.61	1.59	1.62	1.49	1.47	1.58	1.51	0.02
HSI	1.28	1.12	1.15	1.12	1.18	1.24	1.28	1.21	0.02
Survival (%)	97.8	100.0	100.0	99.3	100.0	98.5	99.3	98.5	0.1

18 FO, 18 DP/DE diet with 100% fish oil; 18 SO, 18 DP/DE diet with 75% soybean oil; 18 CO, 18 DP/DE diet with 75% canola oil; 18 COS, 18 DP/DE diet with 75% blend of canola oil and Schizochytrium sp.; 25 FO, 25 DP/DE diet with 100% fish oil; 25 SO, 25 DP/DE diet with 75% soybean oil; 25 CO, 25 DP/DE diet with 75% canola oil; 25 COS, 25 DP/DE diet with 75% blend of canola oil and Schizochytrium sp.; DM, dry matter; DP/DE, digestible protein/digestible energy (lipids); TGC, thermal growth coefficient; FCR, feed conversion ratio; CF, condition factor; HSI, hepatosomatic index. Data represent the mean ± standard error means of three replicates, except for survival data presented as mean ± standard deviation of three replicates. Within the same line, different superscripts indicate significant differences due to the diet ().