Dolphin deaths in South Australia spike after algal bloom decimates food sources
Summary
In 2025, South Australia saw a sharp rise in dolphin deaths, mainly caused by lack of food after a dangerous algal bloom reduced key prey like squid. The bloom, combined with a marine heatwave, affected many marine animals, and experts link the dolphins' poor condition to the damaged food chain.Key Facts
- At least 70 dead common and bottlenose dolphins were found in South Australia in 2025, with 20 more in early 2026.
- Many dolphins were found very thin, especially in the Gulf St Vincent area, which was hit hard by the algal bloom.
- The bloom involved Karenia cristata algae starting in March 2025 and significantly lowered squid populations by about 80%.
- Scientists link dolphin deaths mostly to food shortages caused by the algal bloom's impact on squid and other prey.
- Marine heatwaves since September 2024 may have added stress to marine life in the area.
- A long-running marine mammal postmortem program ended in 2023, making it harder to study dolphin deaths and the bloom’s full impact.
- Experts have called for reinstating systematic dolphin postmortems to better understand causes of death.
- The South Australian government confirmed food chain disruption as a potential reason for increased dolphin deaths.
Read the Full Article
This is a fact-based summary from The Actual News. Click below to read the complete story directly from the original source.
