Table 3. Growth performance and whole-body (WB) composition of rainbow trout fed animal and plant protein diets¹.

Performance	Diet (D)		Diet quality (DQ)		Diet x diet quality (DDQ)				System (S)				P>F2					SEM2
	APD	PPD	Balanced	Unbalanced	Balanced		Unbalanced		FF	FR	RR	RF	Diet	DQ	DDQ	S	D x S
					APD	PPD	APD	PPD
Final weight (g)	120.12	111.27	119.52	111.86	123.20	115.85	117.04	106.68	102.82	119.75	117.67	122.5	0.0008	0.0030	0.5323	<0.0001	0.2284	4.62
Feed intake3 (% bw/d)	2.02	1.96	1.96	2.02	1.98	1.93	2.05	1.99	2.04	2.10	1.93	1.88	0.1508	0.0991	0.9106	0.0008	0.7140	0.07
FCR4 (g feed/g gain)	1.03	1.03	1.01	1.05	1.00	1.01	1.04	1.06	1.08	0.98	1.00	1.04	0.4286	0.0061	0.7910	0.0003	0.8523	0.03
Condition indices
VSI5 (%)	11.06	11.23	11.11	11.19	11.10	11.12	11.03	11.35	12.27	10.87	9.94	11.52	0.5273	0.7690	0.5682	<0.0001	0.6734	0.54
FR6 (%)	26.70	26.33	26.95	26.08	27.48	26.43	25.92	26.23	25.81	27.10	26.42	26.75	0.3357	0.0271	0.0829	0.1199	0.0421	0.76
HIS7 (%)	1.38	1.48	1.30	1.57	1.29	1.30	1.48	1.67	1.27	1.32	1.28	1.86	0.6233	0.1821	0.6525	0.1247	0.9619	0.40
Whole-body Composition
Fat (g/kg)	118.1	110.1	110.8	117.5	114.0	122.2	107.5	112.7	117.9	108.4	113.2	116.8	0.0008	0.0041	0.4828	0.0177	0.3756	0.43
Energy (MJ/kg)	8.8	8.7	8.7	8.8	8.7	8.7	9.0	8.7	9.4	8.1	9.2	8.4	0.2538	0.1246	0.2942	<0.0001	0.0876	50.45
Protein (g/kg)	160.1	164.3	163.4	161.0	162.7	164.1	157.5	164.6	165.9	158.7	162.2	162.1	0.0629	0.2848	0.1974	0.1600	0.4028	0.44

FF—Flow-through system, FR—From Flow-through system to recirculating system, RR—Recirculating system, RF—From recirculating system to flow-through system.

¹Means of three replicates per diet

²Pooled standard error of the mean

³Feed intake (% bw/d) = g dry feed consumed/average fish biomass (g) /culture days *100.

⁴FCR = g dry feed consumed / g weight gained.

⁵VSI (%) = viscera mass x 100 / fish mass

⁶FR (%) = fillet with rib mass * 100 / fish mass.

⁷HIS (%) = liver mass x 100 / fish mass.