Table 1. Typical quality properties of mackerel fillets stored under different conditions

Trait	Storage method	Storage period (days)				SEM¹⁾
Trait	Storage method	0	1	3	6	SEM¹⁾
Drip loss (%)	A	NA	0.57^bz	1.58^a	1.77^ax	0.069
	I	NA	1.32^by	2.17^a	2.03^ax	0.128
	R	NA	0.74^bz	1.50^a	1.57^ax	0.123
	FTW	NA	2.77^ax	1.27^c	1.95^bx	0.133
	FTR	NA	0.51^z	1.05	0.69^y	0.125
	SEM²⁾	NA	0.103	0.188	0.135
Water content (%)	A	60.23	60.64	64.18^x	60.58	0.992
	I	60.23^ab	60.08^ab	61.52^axy	58.68^b	0.421
	R	60.23	59.56	61.01^xy	60.90	0.589
	FTW	60.23	58.31	60.79^xy	60.29	1.211
	FTR	60.23	58.70	59.62^y	59.01	1.452
	SEM²⁾	NA	0.639	0.722	0.792
pH value	A	5.69^c	6.00^b	6.71^a	6.07^b	0.059
	I	5.69^c	6.01^b	6.61^a	6.14^b	0.034
	R	5.69^c	5.98^b	6.63^a	6.05^b	0.036
	FTW	5.69^c	6.01^b	6.69^a	6.03^b	0.030
	FTR	5.69^c	5.95^c	6.65^a	6.10^b	0.019
	SEM²⁾	NA	0.034	0.024	0.051

n=3 of standard error of the least square mean.
n=15 of standard error of the least square mean.
Different superscripts indicate significant difference among means (p<0.05).
Different superscripts indicate significant difference among means (p<0.05).
A, ambient; I, ice; R, refrigerator; FTW, frozen and thawed in water; FTR, frozen and thawed in a refrigerator; NA, not applicable.