668 



Fishery Bulletin 100(4) 



ly in the summer following each harvest (see next section). 

 Sea urchin densities in control sites changed little over 

 time, averaging 1.61/m- (±1.4/m'-) over the study period. 



Recolonization of harvested sites 



Recolonization of complete harvest sites averaged 17.2 sea 

 urchins per month (range: 0-68), or 0.04/m- month. The 

 average size of sea urchins recolonizing complete harvest 

 sites was 129 mm (±19 mm, range: 35-175 mm, ;!=824). 

 Recolonization of complete harvest sites was higher 

 during the summer of each year than during the winter 

 and decreased slightly but not significantly over time 

 (P=0.31,Table5). 



Recolonization of selective hai^est sites was lower 

 than observed in complete harvest sites (average 7.9 sea 

 urchins/month or 0.02/m- month, Table 5). Recolonization 

 was highest during summer 1997, followed by summer 

 1998. There was no net recolonization during winter 1997. 

 Sites were recolonized to 51.2% of original densities by 

 September 1997 (range: 40.9-66.3%, Table 3). In Septem- 

 ber 1998, after two annual harvests, sites averaged 37.7% 

 of original densities (range: 24.8-56.3%). 



Juvenile recruitment 



Juvenile sea urchins were rare in all SJC study sites 

 in March 1997 (0.4% (±0.6%) of sea urchins sampled in 



