Painted Stingfish

Found singly, during the day, buried or resting on mud and sandy bottoms, over estuaries, lagoons, and coastal reefs.
They feed nocturnally on crustaceans and small fish.

Stonefish are masters of camouflage looking and lying like stones and rocks waiting for their prey.
This is the most venomous fish in the world. It has thirteen stout spines in the dorsal fin which can inject a highly toxic venom if trodden on etc., most victims are reef walkers with flimsy shoes or no shoes.
However if the area around them is disturbed they will swim away.
Highly dangerous have been known to cause death.