Alert issued as photos emerge of large bull shark caught in Swan River, days after Stella Berry's death

An image posted to Facebook purporting to show a man who hooked a large shark on the banks of the Swan River. (Facebook)

Authorities say they are working to confirm reports a large shark has been caught and released by a member of the public in the Swan River, near the scene of a fatal attack that killed Perth teenager Stella Berry.

Ms Berry, 16, died after being bitten by what was believed to have been a bull shark on Saturday afternoon, in what was the first fatal shark attack in the river in 100 years.