the blue ring isnt the most venemonus, the box or wasp jelly fish is. they both come from the same area, austraila though.
not to be a jerk, but that looks more like a toadfish than a stonefish. all the stones ive seen (in the wild) have a more round instead of flat face. take a close look at the dorsal spines, see if you can actually see the posionous spines exposed, stones will have them visible.