Table 1. Changes in metabolites (mg/100 g) of yellowfin tuna between the initial and final storage days (day 7)

Metabolite compounds (mg/100 g)	Day 1	Day 7	SEM¹⁾
Free amino acids
Alanine	0.05	0.06	0.006
Glycine	0.12	0.12	0.023
Isoleucine	0.04^b	0.13^a	0.009
Leucine	0.05^b	0.17^a	0.015
Threonine	1.97^b	7.20^a	0.724
Tyrosine	2.37^b	5.16^a	0.235
Valine	0.04^b	0.11^a	0.004
Sarcosine	0.04	0.07	0.000
Niacinamide	0.02^b	0.06^a	0.003
Nucleotide related metabolites
Hypoxanthine	0.18^b	0.35^a	0.018
Inosine	0.17^b	0.31^a	0.025
Miscellaneous metabolites
Choline	0.07^b	0.23^a	0.026
O-Phosphocholine	0.21^b	0.36^a	0.038
Energy-related metabolites
Acetate	0.32^b	1.50^a	0.159
Creatine	0.63^b	2.51^a	0.003
Acetoacetate	0.01	0.02	0.009
Acetone	0.01	0.02	0.012
Succinate	0.09	0.12	0.006
Fumarate	0.00	0.02	0.088
Glucose	1.50^b	2.51^a	0.136
Glycerol	0.70	0.69	0.538
Lactate	1.51^b	5.33^a	0.003
Malonate	0.02	0.03	0.002

SEM, standard error of the mean.
Means with a column with different letters are significantly different (p<0.05).