Stonefish
The Stonefish is one of the most venomous fish. Mainly found on the coasts in the Indo-Pacific oceans, stonefish get their name from its ability to camouflage itself amongst the rocks. Due to its camouflage, swimmers may not see the fish and accidentally step on it. Unfortunately, this normally does not end well for the swimmer. The Stonefish has needle-like dorsal fin spines which secrete neurotoxins when disturbed. There is an anti-venom, and if the sting is minimal, hot water may also destroy the venom.