Stonefish

This master of camouflage is dubbed the most venomous fish. Stonefish are generally harmless to human beings. But when disturbed or worse, stepped on, its defense mechanism is to release a poisonous substance that could potentially kill a human being if not treated within an hour. First aid: To destroy the venom and also lessen the pain, soak affected area in hot water for 30 to 90 minutes. There is also an available anti- venom for further treatment.