Further to Val's enquiry

I am Still searching for William Henry Dalton's birth date and parents and siblings.

His death cert says parents are Lucy and William Dalton
but as we all know depends on the person who gave the information for the death certificate, if they got the names right.

He married in Tasmania Australia to Charlotte Kittelty.

He Worked as ships crew and later became a ship's Captain, sailing freight and passengers between Hobart and Port Phillip, Victoria, Australia.

We have ruled out that he was a convict, very sure he wasnt, cant find where he has entered Australia, as I understand that ships crew were not on passengers lists ? is that right ?