1 Vandellia CirrhosaNative to South America, Vandellia Cirrhosa is one of the most feared venomous fishes in the world. Also called the carnero fish, they can reach lengths of 1-2.5 in (2.5-6 cm) with a width of 3.5 mm. This tiny fish is found to be all covered with sharp little thorns. It has the special ability as it locate the host from the blood and then expands the spines on its target and start sucking the blood from the victim.
2 The StonefishBelonging to the Synanceiidae family of fish, Stonefish is considered as the second most venomous fish in the world. Stonefish is commonly found near the coastal regions of Indo-Pacific oceans and even around the coasts of Florida. This fish has the venom that is stored in its glands just as at the bottom of its 13 needle-shaped dorsal fin spines. Stonefish erects these spines whenever it is threatened. It can cause the death in just a couple of hours.