Very bad news and a timely reminder of why when fishing alone you should always wear a life jacket and have the kill switch lanyard attached to your outboard. These two things may have saved this poor young man
Sharks populations Have plummeted
https://www.google.com/amp/s/amp.theguardian.com/environment/2018/dec/14/queensland-shark-numbers-down-by-90-per-cent-in-55-years-for-some-species