Spotted scorpionfishes (Scorpaena plumieri) are one of the largest and most common scorpionfishes found in the Atlantic and Caribbean waters. These masters of disguise range from 7-18 inches (18-45 cm) and lie in wait to ambush their prey. Although the bite of the scorpionfish is not poisonous, the fish has a pressurized venom gland at the base of it's dorsal fin. This essentially turns its dorsal fin (the top on) into an effective self defense weapon. Lucky for us, the venom isn't generally fatal to humans, but it will cause severe pain and medical treatment should be sought immediately.