Samson fish are a tough fighting fish and close cousin to the yellowtail kingfish (http://www.myfishingplace.com.au/fish/kingfish-yellowtail) and amberjack (http://www.myfishingplace.com.au/fish/amberjack-greater).
Samson fish are closely related to the Yellowtail kingfish and Amberjack. They have a elongated body with a deep forked tail. They are often confused with its cousins however can be distinguished from the yellowtail kingfish as he yellowtail kingfish has a yellow tail (or outline) and the Samson fish, like the amberjack has no yellow on the tail. Samson fish can be distinguished from the amberjack usually by the shape of its head, the samson fish has a steeper profile from the mouth to the beginning of the back. For positive identification count the number of anal fins, amberjacks have 19 or more and samson fish no more than 17. Samson fish can grow to over 50 kgs.
Live bait is probably the best, with Slimies being the preferred, followed by yakka and other such live baits. In more recent years have been targeted with knife jigs which when fished in the hands of a professional will sometimes out fish even live bait. You need strong gear and since they usually hang around structure if there are bigger specimens around you will need 50-80lb braid - even then you will get the unstoppable. The rig I use is two 9/0 hooks smelled together about 10 cm apart connected by about 1 meter to a double swivel, then main line to swivel and about another meter to a sinker (heavy enough that it stays on the bottom - usually between 6-8 ounce)
Samson Fish are found in Australia from Shark Bay in Western Australia around to Yorke Peninsula in South Australia, and up most of the New South Wales offshore waters and into Southern Queensland