ECOLOGY: PORT JACKSON SHARKS 



531 



BROKEN BAY 



▲ AGGREGATES 

 AOVIPOSITION SITES 



Figure 1 Location of aggregates and oviposition 

 sites for H. portusjacksoni in the Sydney area. 



other hand sheltered large numbers of reproductively spent females for very 

 brief periods near the end of the season. It is possible that this cave served pri- 

 marily as a traditional place where postbreeding females gathered before 

 their southward migration. 



Over the 3-year period 665 shark sightings were made on the South Bondi 

 reef, of which 83 were made before the tagging program; 158 were tagged 

 and 146 were resighted, giving a minimum of 30% tagged sightings, and an 

 estimated population well in excess of 200 sharks. The longest recorded in- 

 terval between tagging and resighting was 6 years, though most recoveries 



