She was pronounced dead after being pulled from the Swan River, in the Perth suburb of Fremantle, on Saturday.
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He described the incident as “very, very traumatic” and the family of the girl was “absolutely devastated by the news”.
People have been urged to take “additional caution” and to abide by any beach closures.
This is believed to be the first fatal shark attack in the Swan River since a 13-year-old boy was killed in January 1923.
Australia typically records about 20 shark attacks each year, with most in New South Wales and Western Australia.
There were two fatal shark attacks in 2021, and seven in 2020.
Historically, dying from a shark bite is not common. In more than a century of records, Australia’s shark attack mortality rate is 0.9 – less than one person per year.