Someone has been tipping koi into the River Torrens, and it could cost them dearly. More than a dozen of the bright orange and black fish have been spotted in the river in Adelaide's east, and the people trying to bring platypus back to the Torrens want them out.

File photo of the River Torrens, July 2026. Photo: Yu Chu Chin / Wikimedia Commons (CC BY-SA 4.0), cropped