Effects of Salinity on Muscle Nutrition, Fatty Acid Composition, and Substance Anabolic Metabolism of Blue Tilapia Oreochromis aureus

Table 2

Amino acid composition in muscle of Oreochromis aurea after 60 days culture at different salinities (g/100 g, n > 3).

Category	Amino acid	0	3	5	7	9	11
EAA	Threonine	0.74 ± 0.04	0.74 ± 0.01	0.75 ± 0	0.74 ± 0.01	0.75 ± 0.03	0.7 ± 0.005
	Valine	0.80 ± 0.04	0.82 ± 0.03	0.83 ± 0.03	0.84 ± 0.02	0.82 ± 0.03	0.80 ± 0.01
	Methionine	0.48 ± 0.03	0.48 ± 0.02	0.5 ± 0.01	0.50 ± 0.02	0.48 ± 0.03	0.47 ± 0.01
	Isoleucine	0.70 ± 0.04^a	0.73 ± 0.03^ab	0.74 ± 0.03^ab	0.76 ± 0.01^b	0.73 ± 0.03^ab	0.70 ± 0.01^a
	Leucine	1.27 ± 0.06	1.28 ± 0.03	1.31 ± 0.01	1.29 ± 0.02	1.29 ± 0.05	1.2 ± 0.01
	Phenylalanine	0.69 ± 0.04	0.69 ± 0.01	0.72 ± 0.005	0.69 ± 0.01	0.68 ± 0.03	0.67 ± 0.01
	Lysine	1.54 ± 0.06	1.53 ± 0.02	1.58 ± 0.01	1.55 ± 0.03	1.54 ± 0.07	1.55 ± 0.02
NEAA	Asparagic acid	1.71 ± 0.08	1.69 ± 0.03	1.76 ± 0.01	1.71 ± 0.02	1.71 ± 0.07	1.71 ± 0.02
	Serine	0.66 ± 0.03	0.65 ± 0.01	0.66 ± 0.01	0.6 ± 0.01	0.66 ± 0.02	0.6 ± 0.01
	Glutamic acid	2.45 ± 0.08	2.45 ± 0.03	2.51 ± 0.01	2.45 ± 0.05	2.47 ± 0.09	2.48 ± 0.02
	Glycine	0.89 ± 0.00	0.92 ± 0.02	0.91 ± 0.01	0.88 ± 0.01	0.92 ± 0.02	0.89 ± 0.03
	Alanine	1.03 ± 0.04	1.04 ± 0.03	1.06 ± 0.005	1.05 ± 0.02	1.03 ± 0.04	1.04 ± 0.02
	Tyrosine	0.55 ± 0.02	0.56 ± 0.02	0.58 ± 0.01	0.55 ± 0.01	0.55 ± 0.02	0.55 ± 0.01
	Histidine	0.43 ± 0.02	0.41 ± 0.01	0.42 ± 0.001	0.42 ± 0.01	0.43 ± 0.01	0.41 ± 0.01
	Arginine	0.98 ± 0.03	1.00 ± 0.03	1.00 ± 0.005	0.97 ± 0.03	1.01 ± 0.04	1.00 ± 0.02
	Proline	0.63 ± 0.05	0.61 ± 0.03	0.63 ± 0.02	0.5 ± 0.005	0.63 ± 0.02	0.63 ± 0.02
Total TAA		15.57 ± 0.61	15.57 ± 0.33	15.97 ± 0.09	15.6 ± 0.17	15.7 ± 0.57	15.6 ± 0.08
Total EAA		6.22 ± 0.29	6.26 ± 0.14	6.43 ± 0.07	6.37 ± 0.10	6.28 ± 0.28	6.21 ± 0.02
Total NEAA		9.33 ± 0.36	9.33 ± 0.19	9.51 ± 0.01	9.26 ± 0.11	9.42 ± 0.32	9.37 ± 0.07
DAA		6.08 ± 0.20	6.1 ± 0.09	6.23 ± 0.04	6.09 ± 0.09	6.13 ± 0.22	6.11 ± 0.04
BCAA		2.77 ± 0.13	2.83 ± 0.08	2.88 ± 0.07	2.89 ± 0.06	2.83 ± 0.12	2.78 ± 0.02
EAA/TAA		39.9 ± 0.30^a	40.2 ± 0.13^ab	40.2 ± 0.23^ab	40.6 ± 0.18^b	39.9 ± 0.32^a	39.8 ± 0.18^a
EAA/NEAA		66.6 ± 0.54^ab	67.0 ± 0.32^ab	67.5 ± 0.79^b	68.7 ± 0.23^c	66.6 ± 0.67^ab	66.2 ± 0.44^a
DAA/TAA		39.09 ± 0.23	39.17 ± 0.26	39.04 ± 0.23	38.8 ± 0.15	39.07 ± 0.01	39.1 ± 0.09

Note. 0 : 0 ppt salinity; 3 : 3 ppt salinity; 5 : 5 ppt salinity; 7 : 7 ppt salinity; 9 : 9 ppt salinity; 11 : 11 ppt salinity; EAA stands for essential amino acids, including threonine, valine, methionine, isoleucine, leucine, phenylalanine, and lysine; NEAA stands for nonessential amino acids; DAA stands for delicious amino acids, including asparagus Amino acid, glutamic acid, glycine, and alanine; TAA means total amino acids; BCAA means branched chain amino acids, including valine, isoleucine, and leucine; different English letters in the upper right corner of the same row of values indicate significant difference ().