Table 4.

Amino acid composition of diploid and triploid Hong Kong oysters, Crassostrea hongkongensis, in the non-reproductive and reproductive phases.

	Non-reproductive				Reproductive
Amino acid	Content (g/100 g meat)		Content (mg/g protein)		Content (g/100 g meat)		Content (mg/g protein)
	2N	3N	2N	3N	2N	3N	2N	3N
Aspartic acid	4.16 ± 0.60	4.27 ± 0.57	107.8	108.4	5.83 ± 0.98a	3.91 ± 0.07b	111.3	105.1
*Threonine	1.92 ± 0.27	1.93 ± 0.24	49.7	49.0	2.72 ± 0.48a	1.77 ± 0.04b	51.9	47.6
Serine	2.04 ± 0.25	2.00 ± 0.36	52.8	50.8	2.95 ± 0.64a	1.80 ± 0.03b	56.3	48.4
Glutamic acid	5.43 ± 0.66	5.86 ± 0.25	140.7	148.7	7.44 ± 1.30	5.72 ± 0.19	142.0	153.8
Proline	1.67 ± 0.28	1.81 ± 0.08	43.3	45.9	2.22 ± 0.29	1.76 ± 0.04	42.4	47.3
Glycine	2.46 ± 0.52	2.94 ± 0.38	63.7	74.6	2.97 ± 0.52	3.14 ± 0.04	56.7	84.4
Alanine	2.09 ± 0.26	2.24 ± 0.08	54.1	56.9	2.75 ± 0.48a	2.20 ± 0.04b	52.5	59.1
*Valine	2.07 ± 0.30	2.03 ± 0.30	53.6	51.5	2.88 ± 0.48a	1.83 ± 0.04b	55.0	49.2
*Methionine	0.71 ± 0.13	0.77 ± 0.03	18.4	19.5	0.95 ± 0.11a	0.75 ± 0.03b	18.1	20.2
*Isoleucine	1.73 ± 0.27	1.73 ± 0.27	44.8	43.9	2.48 ± 0.45a	1.55 ± 0.03b	47.3	41.7
*Leucine	2.78 ± 0.35	2.67 ± 0.41	72.0	67.8	3.92 ± 0.75a	2.45 ± 0.04b	74.8	65.9
Tyrosine	1.36 ± 0.13	1.38 ± 0.14	35.2	35.0	1.83 ± 0.36	1.31 ± 0.07	34.9	35.2
*Phenylalanine	2.01 ± 0.21	1.94 ± 0.32	52.1	49.2	2.87 ± 0.63a	1.74 ± 0.03b	54.8	46.8
*Lysine	3.18 ± 0.35	2.91 ± 0.51	82.4	73.9	4.32 ± 0.79a	2.63 ± 0.02b	82.4	70.7
*Histidine	0.94 ± 0.20	0.99 ± 0.16	24.4	25.1	1.22 ± 0.09a	0.92 ± 0.08b	23.3	24.7
*Arginine	2.74 ± 0.27	2.62 ± 0.28	71.0	66.5	3.71 ± 0.72a	2.46 ± 0.02b	70.8	66.1
Tryptophan	1.31 ± 0.02	1.32 ± 0.04	33.9	33.5	1.34 ± 0.10	1.26 ± 0.05	25.6	33.9
Total	38.60	39.41	999.9	1000.2	52.40	37.16	1000.1	999.0

Means ± SD followed by different letter within a line are significantly different (P < 0.05).

^“*”indicate essential amino-acids.