Preliminary investigation of perfluoroalkyl substances in exploited fishes of two contaminated estuaries

• PFAS concentrations were measured in exploited species across two contaminated estuaries.
• All samples contained perfluoro-n-octane sulphonate (PFOS) except four Yellowfin Bream samples.
• PFOS concentrations were greatest in School and Eastern King Prawn, Dusky Flathead and Mud Crab.
• Perfluoro-n-octanoic acid (PFOA) was detected only in School Prawn samples.
• Perfluoro-n-hexane sulphonate (PFHxS) was detected in prawn muscle and fish liver samples.

Perfluoroalkyl substances (PFASs) are being increasingly detected in a range of aquatic and terrestrial ecosystems, often resulting from the use of legacy fire-fighting foams. This study conducted an initial investigation of the concentrations of PFASs in the commercially and recreationally exploited species Dusky Flathead, Mud Crab, School Prawn, Sea Mullet, Yellowfin Bream, Eastern King Prawn and Sand Whiting, across two contaminated estuaries. All samples contained perfluoro-n-octane sulfonate (PFOS) except four Yellowfin Bream samples (two from each estuary). Perfluoro-n-octanoic acid (PFOA) was detected only in School Prawn samples from Fullerton Cove, while perfluoro-n-hexane sulfonate (PFHxS) was detected in prawn muscle and in fish liver samples from both estuaries. This study presents one of the first surveys of PFAS in a range of edible saltwater fish and crustaceans in Australia, and these baseline levels of contamination will prove useful for informing future surveys of these emerging contaminants.