Table 1 Comparative analysis of gonadosomatic index (GSI), sex hormone and thyroid hormone between diploid (2n) and induced triploid (3n) Far Eastern catfish, Silurus asotus in spawning and non-spawning season¹

	Spawning²		Non-spawning²		Two-way ANOVA test
	2n	3n	2n	3n	Season	Ploidy	Interaction
Body weight(BW, g)	324.1±6.88^b	904.2±9.17^d	309.8±7.41^a	894.3±8.54^c	P<0.05	P<0.05	P<0.05
Subcutaneous fat weight/BW (%)	004.7±0.54^a	16.5±1.02^c	008.9±0.77^b	16.6±1.06^c	P<0.04	P<0.03	P<0.04
GSI (%)³	011.4±1.55^c	0.1±0.02^a	006.4±1.01^b	0.1±0.02^a	P<0.05	P<0.04	P<0.05
Estradiol (pg/L)	075.1±8.67^c	08.6±1.43^a	010.1±1.88^b	08.6±1.43^a	P<0.04	P<0.04	P<0.14
Testosterone (ng/L)	008.3±1.36^c	1.9±0.15^a	002.3±0.13^b	1.9±0.15^a	P<0.04	P<0.05	P<0.11
Thyroid stimulating hormone (μIU/L)	002.5±0.38^a	3.9±0.52^b	003.7±0.44^b	3.8±0.92^b	P<0.08	P<0.01	P<0.10
Thyroxine (μg/dL)	007.9±1.12^a	11.4±1.24^b	011.5±1.39^b	11.3±1.71^b	P<0.06	P<0.01	P<0.12

¹Values of each group were mean±standard error. Values in the same column not sharing common superscripts are significantly different among ploidy and season (P<0.05).
²All parameters of each group were measured in May, 2016 for spawning season and January, 2016 for non-spwaning season, respectively.
³Gonadosomatic index (GSI)=(Gonad weight/Body weight)×100.