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

Table 6

Effect of feeding with a washout diet of herring oil on rainbow trout growth, nutritive utilization, and somatic parameters.

	18 FO	18 SO	18 CO	18 COS	25 FO	25 SO	25 CO	25 COS	Pooled SEM
Initial weight (g)	617.1	596.9	570.2	577.8	580.1	561.3	535.7	549.7	7.7
Final weight (g)	916.6	949.8	906.4	938.7	815.8	776.2	797.5	782.4	19.0
Weight gain (g)	299.5	352.9	336.2	220.7	235.7	214.9	261.7	232.8	14.9
TGC	0.17	0.20	0.19	0.13	0.14	0.13	0.16	0.14	0.01
FCR	1.33	1.16	1.23	1.29	1.16	1.17	1.29	1.19	0.03
CF	1.58^a,b	1.64^a,b	1.65^a	1.55^a,b	1.58^a,b	1.47^b	1.64^a,b	1.58^a,b	0.02
HSI	1.06	1.22	1.16	1.17	1.22	1.11	1.21	1.26	0.02
Survival (%)	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0

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.; 24 FO, 24 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 duplicates, except for survival data presented as mean ± standard deviation of duplicates. Within the same line, different superscripts indicate significant differences due to the diet ().