Stonefish
Stonefish are considered to be the most poisonous fish in the world. They are usually found in Indo-Pacific coastal regions. As the name suggests, stonefish look like rocks, allowing them to camouflage themselves for both protection and hunting prey. When stepped on, a stone fish’s dorsal fin spines will release a toxin that can kill an adult in under an hour. The stonefish usually uses this venom not to catch its prey, rather, as a defense mechanism from other predators in the waters. It uses its powerful jaws and big mouth to suck down its prey, enabling the stonefish to swallow other creatures whole.