The Optimum Dietary Phenylalanine Requirement of Hybrid Grouper (Epinephelusfuscoguttatus ♀ × Epinepheluslanceolatus ♂) Juveniles: Effects on Growth Performance, Gut Micromorphology, and Antioxidation

Table 3

Growth performance and feed utilization of hybrid grouper juveniles fed different dietary Phe levels for 8 weeks.

Dietary Phe levels (g/kg)	WG (%)^a	DFI^b (g/100 g fish/day)	FE^c	PER^d	PPV^e (%)	Survival (%)
8.2	182	1.74	1.03	2.34	33.93	100
9.2	237	1.37	1.31	3.00	44.89	100
10.1	299	1.31	1.37	3.08	47.61	94
11.2	221	1.42	1.29	2.96	44.57	100
13.3	266	1.27	1.42	3.18	47.96	97
15.2	225	1.45	1.24	2.80	41.74	97
17.3	216	1.53	1.17	2.62	37.84	94
PSE^6	8.62	0.04	0.04	0.08	1.41	0.92
Regression (N = 3)
SOP
Adj. R^2	0.351	0.401	0.411	0.417	0.409	0.140
P-Value	0.039	0.010	0.008	0.008	0.009	0.258

^aWG%, weight gain; ^bDFI, daily feed intake; ^cFE, feed efficiency; ^dPER, protein efficiency ratio; ^ePPV, protein productive value; ^fPSE, pooled standard error of treatment means (n = 3).