Overview

• A man in his 40s was attacked by a shark while swimming near Port Noarlunga and is in critical condition after emergency medical care on the beach and hospital transfer.
• The species of shark involved has not yet been identified, and beachgoers were ordered to leave the water as a precautionary measure.
• Port Noarlunga, a popular spot for snorkelers and divers, lies within a marine protected area known for its diverse reef ecosystem.
• Scientists are investigating whether elevated water temperatures and a massive microalgae bloom observed since March are altering shark behavior and movements.
• Authorities are also probing the unexplained deaths of three sharks found recently in South Australian waters, including a great white shark at Henley Beach.