Bull shark blamed for fatal Swan River attack on Stella Berry, as tagging program to be widened

Stella Berry died on February 4 after she was bitten by a shark while swimming in North Fremantle. (Supplied: Family)

DNA tests have confirmed a bull shark was involved in the death of 16-year-old Stella Berry in Perth's Swan River last month, authorities say, as the WA government moves to expand its shark tagging program.

The evidence confirming a bull shark was responsible for Ms Berry's death is now being prepared for the coroner.