Sydney Harbour
Sydney estuarine · NSW · Estuary / river-mouth node on the east-coast bull shark corridor
Bull shark conditions
Bull shark ecological conditions are assessed as MODERATE (development model bull-shark-0.1-dev) with very low confidence. This is not an attack probability and is not the mixed-species 0–100 interaction index.
Factors increasing conditions
- Estuary / river-mouth node — bull sharks can use these systems (ecological basis, not a detection).
Factors reducing conditions
- Coastal SST ~18.0°C is only weakly favourable on this development thermal curve.
- No live authorised bull-shark detections in vShark.
- Seasonal prior for this month is not the peak east-coast inshore hypothesis window.
Uncertainty
- EAC / current velocity is a candidate variable and is not connected.
- Acoustic receiver health is UNKNOWN — SharkSmart/IMOS tracking is not machine-connected.
- River discharge gauges are not connected; rainfall is only a proxy.
Environmental indicators are not confirmed shark observations. This is not an attack prediction and is not the mixed-species 0–100 index.
What has actually been observed
Confirmed shark observations: none in vShark (no live authorised feed).
Environmental indicators (SST, rainfall proxy) are shown in the conditions card. They are not detections.
Surveillance
No receiver assets recorded.
Assessed context 22 Sept 2026, 12:08 am. Official beach advice always outranks this page.