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

Table 2

Amino acid compositions (g/kg) of experimental diets (dry-matter basis).

AA/∑AA	Dietary Phe levels (g/kg)
	8.2	9.2	10.1	11.2	13.3	15.2	17.3
EAA
Lysine	20.2	20.6	19.9	19.4	20.3	20.1	18.6
Arginine	33.9	31.8	32.6	33.2	32.3	32.7	31.8
Methionine	14.3	13.8	13.7	14.2	13.5	13.9	13.8
Threonine	11.1	10.7	11.2	10.5	10.6	11.4	10.8
Isoleucine	19.9	19.4	18.7	18.1	19	19.3	19.9
Leucine	31.8	30.6	30.3	29.3	30.7	30.7	30.8
Phenylalanine	8.2	9.2	10.1	11.2	13.3	15.2	17.3
Valine	15.7	15.7	15.7	14.3	15.3	15.1	14.5
Histidine	11	10	11	10.8	10.8	10.4	10.6
∑EAA	166.1	161.8	163.2	161.0	165.8	168.8	168.1
NEAA
Aspartic acid	45.1	48.5	48.7	45.9	49.5	49.3	42.5
Serine	19.6	19.1	19.4	19	19.2	19.5	19
Glutamic acid	84.6	81.9	84.4	87.8	83.9	81.8	86.6
Glycine	28.1	25.6	25.9	26.5	27.2	27.2	30.3
Alanine	38.4	36.1	32.8	33.1	34	35.7	34.1
Cystine	5.8	2.8	2.9	1.4	5.9	3.9	4.4
Tyrosine	16.5	15.3	15.2	15	15.2	17.1	16
Proline	24.3	22.8	22.4	21.8	22.6	23.3	24.4
∑NEAA	262.4	252.1	251.7	250.5	258.6	257.8	257.3
∑AA	428.5	413.9	414.9	411.5	423.3	426.6	425.4