@farmerman,
That's our German volunteer worker holding the crab. It's about 2.7 kg, and I've weighed one in at 3.3 kg. Yeah, he's holding it out a bit. Aussies just call them muddies, as opposed to sandies, which are much different.
A crab like the one pictured would retail for around sixty dollars, or maybe a little more.
I split them in two, clean out the carapace, and crack the large claws. Steam them with a mix of chilly, ginger, and garlic, for about twenty minutes.