Heres a Picture and a bio I found online.
Scorpionfishes have large, heavily ridged and spined heads. Venomous spines on their back and fins with a groove and venom sack. Well camouflaged with tassels, warts and colored specks. Some scorpionfishes can change their color to better match their surroundings. The stonefish is a master of disguise and deception, it looks like a piece of coral or sand covered rock. Thus he can blend in with its surroundings and go unnoticed by its prey.
Most scorpion fishes live on or near the bottom. They lie in crevices, in caves and under overhangs. Range: Red Sea , pacific ocean to Australia, Hawaii. A few scorpionfishes (no lionfishes or stonefishes) live in the Caribbean
They feed on crustaceans, cephalopods and fishes employing a lie-in-wait strategy, remaining stationary and snapping prey that comes near. With their mouth they create a vacuum and suck prey in during a nearly imperceptible split-second movement (15 milliseconds).
Some have algae and hydroid growth on their body surfaces( stonefish) and at least one species (Decoy scorpionfish Iracundus signifier) has a dorsal fin that looks like a swimming fish, a behavior similar to that of the frogfish. Some species (for example the weed scorpionfish) sway their bodies from side to side so they look like a piece of debris.
Scorpionfishes are not aggressive, but if threatened they will erect their dorsal spines. If danger continues they flee, usually very fast but only for a short distance and then quickly settle back and freeze. The stonefishes for example ususally bury themselves in sand or rubble using a shoveling motion of their pectoral fins. In a matter of less than 10 seconds only the dorsal portion of the head remains exposed, some sand is thrown on top to further enhancing concealment. Some species like the devilfish have very bright red and yellow colors on the inner surface of their pectoral fins. Those colors are not visible when resting but are flashed if threatened.
Scorpion fishes produce a floating, gelatinous mass in which the eggs are embedded.
