Citizen science reveals extent of sea dragon deaths in SA bloom
A citizen science report found 1,524 dead weedy sea dragons and 159 dead leafy sea dragons from South Australia's harmful algal bloom.
South Australia's harmful algal bloom killed nearly 1,700 sea dragons. The Dragon Search SA study analysed 1,540 reports from 253 people, documenting about 1,524 dead weedy sea dragons and 159 leafy sea dragons across the state.
South Australia is a world hotspot for both species. The bloom started in early 2025.
It hit Encounter Bay, St Vincent, Spencer Gulf, and waters off Kangaroo Island particularly hard. Sea dragons cannot swim away quickly from algal blooms.
They also have small gill pores that get blocked by microalgae. Beyond sea dragons, the bloom killed at least 787 seagrass-dwelling brushtail pipefish and 574 spotted pipefish.
Researchers are looking at ways to help sea dragon numbers grow. This matters as the species enter their October breeding season.
Researchers also want to restore damaged habitats. This includes seagrass meadows lost since the 1950s.
- 1,524
- Dead weedy sea dragons
- 159
- Dead leafy sea dragons
- 1,540 from 253 people
- Citizen reports analysed
- 787 brushtail, 574 spotted pipefish
- Other pipefish deaths
Why it mattersThe mass death of these endangered species shows serious damage to marine ecosystems. It raises questions about whether habitat restoration can fix the damage.
AustraliaSouth Australian marine life and the coastal ecosystem face ongoing threats from harmful algal blooms, with recovery efforts now underway.
✓ Claims checked against the source and corrected before publish. checked 7 d ago
