Table 5 Results of Student's t-test for differences in 7 dorsal fin distance between male (♂) and female (♀) of marine medaka, Oryzias dancena by days after hatched^*

Days after hatched						190	230	270	330
D1 (♂)	1.06±0.33^a	1.17±0.24^a	1.80±0.43^a	2.04±0.43^a	2.17±0.43^a	2.48±0.47^a	2.85±0.72^a	3.24±0.70^a	3.25±0.70^a
D1 (♀)	1.02±0.48^b	1.14±0.34^b	1.60±0.42^b	1.81±0.49^b	2.00±0.48^b	2.18±0.49^b	2.53±0.61^b	2.62±0.77^b	2.70±0.86^b
D2 (♂)	1.44±0.28^a	1.56±0.33^a	2.66±0.46^a	3.04±0.44^a	3.27±0.67^a	3.69±0.52^a	4.27±0.58^a	4.80±0.67^a	4.85±0.72^a
D2 (♀)	1.44±0.49^b	1.54±0.36^b	2.26±0.51^b	2.72±0.55^b	2.85±0.62^b	3.13±0.53^b	3.63±0.51^b	4.07±0.51^b	4.08±0.58^b
D3 (♂)	1.43±0.56^a	1.64±0.38^a	3.01±0.53^a	3.42±0.59^a	3.65±0.51^a	4.56±0.66^a	5.07±0.59^a	5.86±0.79^a	6.26±0.72^a
D3 (♀)	1.43±0.59^b	1.63±0.33^b	2.23±0.55^b	2.77±0.55^b	2.90±0.53^b	3.17±0.56^b	3.64±0.76^b	4.01±0.80^b	4.61±0.79^b
D4 (♂)	1.46±0.51^a	1.60±0.29^a	2.72±0.59^a	3.15±0.56^a	3.48±0.48^a	4.05±0.60^a	4.73±0.71^a	5.70±0.70^a	5.86±0.74^a
D4 (♀)	1.38±0.44^b	1.48±0.40^b	2.13±0.54^b	2.58±0.48^b	2.65±0.55^b	2.92±0.61^b	3.43±0.77^b	4.10±0.60^b	4.40±0.79^b
D5 (♂)	1.18±0.39^a	1.38±0.30^a	2.16±0.57^a	2.41±0.61^a	2.52±0.43^a	2.95±0.49^a	3.51±0.72^a	4.15±0.68^a	4.28±0.73^a
D5 (♀)	1.17±0.58^b	1.25±0.35^b	1.78±0.49^b	2.16±0.54^b	2.29±0.65^b	2.53±0.51^b	3.02±0.41^b	3.18±0.66^b	3.26±0.62^b
D6 (♂)	0.69±0.10^a	1.07±0.34^a	1.70±0.61^a	1.96±0.68^a	2.15±0.48^a	2.53±0.55^a	2.93±0.68^a	3.26±0.79^a	3.37±0.78^a
D6 (♀)	0.69±0.11^b	0.96±0.21^b	1.45±0.66^b	1.78±0.66^b	1.87±0.61^b	2.06±0.56^b	2.38±0.79^b	2.61±0.73^b	2.83±0.62^b
D7 (♂)	0.48±0.11^a	0.74±0.20^a	1.43±0.41^a	1.60±0.49^a	1.70±0.44^a	1.99±0.55^a	2.44±0.53^a	2.85±0.74^a	2.95±0.64^a
D7 (♀)	0.48±0.08^b	0.74±0.25^b	1.25±0.52^b	1.32±0.46^b	1.42±0.47^b	1.59±0.50^b	1.74±0.76^b	2.07±0.51^b	2.21±0.87^b

^*For abbreviations see Table 2. The sample numbers of males and females are 30 and 30, respectively. P<0.05.