784 
Fishery Bulletin 96(4), 1998 
Figure 7 
Statolith microstructure of Nototodarus hawaiiensis (A) dorsal dome region of statolith male (132 increments, 127 pm ML) — note 
the distinct inner opaque zone followed by the outer translucent zone, scale bar = 100 pm (B) dorsal dome region of statolith of 
female (166 pm ML, increment count not taken) — note the less distinct opaque and translucent zones, scale bar = 100 pm (C) 
dorsal dome region of statolith of female (146 increments, 136 pm ML) — note lack of any obvious opaque zone and the unusual 
overlapping increment structure shown to the right of the photograph, scale bar = 100 pm (D) nuclear region of statolith of 
juvenile female (61 increments, 57 pm ML), scale bar = 25 pm. 
a spring peak, whereas individuals captured at the 
Antarctic Polar Front hatched in winter (Rodhouse 
et al., 1994). This preliminary data indicates a late 
winter-spring to early summer hatching for N. 
hawaiiensis in this study. Wadley ( 1993) collected 50- 
mm-ML juveniles of N. hawaiiensis off the North 
West Slope in August and 70-80 mm ML juveniles 
in April, suggesting hatching at different times of 
the year. From plankton surveys and collection of 
mature females in North West Slope waters, Dun- 
ning (1988a) concluded that N. hawaiiensis spawned 
year-round because paralarvae and juveniles were 
captured in September and October, and mature fe- 
males were captured in February, April, August, and 
late September. 
Statolith zones 
The origin of the opaque and translucent zones within 
the statolith microstructure of some of the N. 
