Effects of Dietary Fish Meal Replaced by Fish Steak Meal on Growth Performance, Antioxidant Capacity, Intestinal Health and Microflora, Inflammatory Response, and Protein Metabolism of Large Yellow Croaker Larimichthys crocea

Table 4

Growth performance and feed utilization of large yellow croaker fed the different experimental diets (mean ± SD, n = 4)¹.

Index^2	Diets					P value
	FSM0	FSM25	FSM50	FSM75	FSM100	ANOVA	Linear	Quadratic
FBW (g)	82.63 ± 7.82^a	82.11 ± 7.22^a	72.03 ± 9.19^ab	72.92 ± 11.14^ab	64.46 ± 6.05^b	0.042	0.002	0.010
WG (%)	330.77 ± 30.77^a	306.76 ± 13.41^ab	279.81 ± 21.76^bc	267.93 ± 14.83^cd	232.85 ± 30.34^d	<0.001	<0.001	<0.001
SR (%)	66.25 ± 2.85	65.00 ± 4.90	65.42 ± 6.72	63.75 ± 6.72	62.08 ± 6.58	0.861	0.266	0.527
SGR (%/day)	2.60 ± 0.13^a	2.50 ± 0.06^ab	2.38 ± 0.10^bc	2.33 ± 0.07^c	2.14 ± 0.16^d	<0.001	<0.001	<0.001
FCR	1.53 ± 0.07^c	1.64 ± 0.14^bc	1.81 ± 0.24^b	2.05 ± 0.11^a	2.06 ± 0.09^a	<0.001	<0.001	<0.001
PER	1.48 ± 0.06^a	1.40 ± 0.12^ab	1.27 ± 0.18^b	1.10 ± 0.06^c	1.10 ± 0.05^c	<0.001	<0.001	<0.001

¹Means in the same row sharing the same superscript letter are not significantly different. The significance threshold was . ²FBW, final body weight; feed conversion rate (FCR) = dry feed fed (g)/wet weight gain (g); FSM, fish steak meal; protein efficiency ratio (PER) = wet weight gain (g)/dry protein fed (g); specific growth rate (SGR, %/day) = (Ln W_t − Ln W₀) × 100/t; survival rate (SR, %) = 100 × (N_t/N₀); weight gain (WG, %) = (W_t − W₀) × 100/W₀. W₀ and W_t represent the initial, final body weight, respectively. N₀ and N_t are initial and final number of fish.