An uncle spent time in Oz as a commercial diver/welder. On his off time he snorkeled/free-dove for the crawfish where they'd be under rocks or coral or something. The guys carried a little doohickey to measure them with, to make sure they were legal size. I thought for sure he was catching them in salt water though? And, yes, they did call them "crayfish" (I think). Surely not lobster.
He claimed those crawfish were the best he ever ate. We would mail him the little sacks of dried "Louisiana Crab Boil" by Zatarain's. The liquid boil would have been more expensive to ship. Now, they sell the powdered mix that is the quintessential Louisiana crab boil. Easy-peezy-fo-sheezy!
My uncle (a thoroughbred Cajun) claimed that yellow head-fat was every bit as delicious as the fat in our Louisiana crawfish. That is what we suck the heads for!
The weird food guy, Andrew Zimmern showed an Australian fisherman about the head fat of lobsters on a show where they cooked them on the beach. The Aussie was very reluctant to try it. But, afterwards he swore he'd never let any more of that good stuff go in the trash ever again.