Paul Robinson, the Fremantle District Acting Inspector, refused to disclose in-depth details about the teenager’s injuries or identity.
In a statement, he said it was “unusual” for a shark to venture far upriver but that he had issued a shark warning to “let people know this incident has taken place”.
He confirmed the girl and her friends were “on Jet Skis” and that there was “possibly” a pod of dolphins seen nearby.
He added: “The young female jumped in the water to swim nearby the dolphins.”
