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

Table 5

Gut micromorphology of hybrid grouper juveniles fed different dietary Phe levels.

Dietary Phe levels (g/kg)	Foregut				Midgut
	HF (μm)^a	WF (μm)^b	HE (μm)^c	HMV (μm)^d	HF (μm)	WF (μm)	HE (μm)	HMV (μm)
8.2	283	60	30	3.73	207	63	30	3.52
9.2	269	67	31	4.07	288	69	33	3.81
10.1	469	79	38	5.41	387	75	37	4.10
11.2	371	70	37	4.38	356	83	41	4.05
13.3	513	74	34	4.22	423	71	33	4.73
15.2	394	74	33	4.33	366	77	32	4.12
17.3	299	64	32	4.03	317	72	35	4.12
PSE	20.47	1.53	0.79	0.13	20.62	1.73	0.92	0.11
Regression (N = 3)
SOP
Adj. R^2	0.542	0.537	0.444	0.307	0.426	0.303	0.164	0.380
P-Value	0.001	0.001	0.005	0.037	0.007	0.039	0.200	0.013

^ahF, fold height; ^bwF, fold width; ^chE, enterocyte height; ^dhMV, microvillus height.