Nakano et al. : Development of swimming speed and schooling behavior in juvenile Sebastes cheni 
125 
Total length (mm) 
Figure 3 
Nearest neighbor distance (NND), which was measured in millimeters 
and divided by total length (TL) to facilitate comparison among size 
classes of juvenile white rockfish ( Sebastes cheni) at each size class (TL 
in millimeters) under different light conditions (from 0.1 to 10,000 lx). 
Error bars indicate standard deviations, and letters indicate significant 
difference in NND among fish at different light conditions within the 
same size class (Kruskal-Wallis test with Steel-Dwass’s test as post- 
hoc: P<0.001). NS indicates that no significant difference was observed 
for fish within the same size class (P>0.05). 
■ 0.1 lx Hi lx Bio lx El 100 lx □ 1000 lx □ 10, 000 lx 
23.4 30.3 41.1 49.4 58.6 
Total length (mm) 
Figure 4 
Separation angle (SA), measured in degrees, of juvenile white rockfish (Se- 
bastes cheni) at each size class (total length in millimeters) under different 
light conditions (from 0.1 to 10,000 lx). Error bars indicate standard devia- 
tions. The effect of light condition on SA was not significant within each 
size class (Kruskal-Wallis test: P>0.05). 
