Table 2.
Nuclear size for horizontal cell and ganglion cell of retina and neuronal cell of optic tectum in diploid and induced triploid marine medaka, Oryzias dancena*

	Diploid	Induced triploid	Ratios of means
Horizontal cell nucleus in inner nuclear layer ofretina**
Major axis(µm)	3.7±0.28a	4.0±0.33b	1.10
Minor axis(µm)	2.2±0.11a	2.6±0.13b	1.21
Surface area(µm2)	6.3±0.69a	8.3±0.87b	1.33
Volume(µm3)	9.1±0.79a	14.6±1.44b	1.60
Ganglion cell nucleus in ganglion cell layer ofretina**
Major axis(µm)	3.2±0.14a	4.1±0.46b	1.29
Minor axis(µm)	2.9±0.26a	3.6±0.23b	1.24
Surface area(µm2)	7.2±0.90a	11.5±1.10b	1.60
Volume(µm3)	14.0±1.29a	27.9±1.78b	2.00

Each values are the means standard deviation of triplicated groups. Means in rows with the different superscript letter are significantly different (P < 0.05), Ratios of means = induced triploid/diploid.
Surface area= 1/4 × abπ and volume = 4/3 × π(a/2) × (b/2)2 (where a = the major axis of a cell or nucleus; b = the minor axis of a cell or nucleus; after Park and Kim, 2000).