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Fugu, a Japanese word for pufferfish, is one of the most dangerous fish. It may look harmless, but fugu contains tetrodotoxin, a deadly neurotoxin that is deadlier than cyanide.
Found in warm waters, including Australia, Hawaii, and the Gulf of Mexico. It has long, venomous tentacles reaching 10 feet long. Its sting is often compared to being burned alive.
While attacks are rare, stingray punctures can be very painful or deadly. When stepped on, they often lash out with their tail, leaving a deep and extremely painful wound.
It is only around one inch in length, but very dangerous. Commonly found in the Amazon River, the candiru is a parasitic fish. It enters the body through the urethra.
Lionfish have long, flowing fins and 18 venomous spines that can deliver a painful, sometimes fatal, sting.