jellyfish have harmful toxins and are among the most toxic animals in the world. This jellyfish venom can attack the heart nerve. Humans who become victims will die of heart failure. About 100 people die every year from box jellyfish attacks
The name of the box jellyfish refers to its boxy body. These jellyfish can be found in the ocean of indo-pacific. Each jellyfish has 15 tentacles on each side of its body.This tentacle can be up to 10 feet long and contains more than 5000 poison cells. 
The pufferfish is also deadly. There are about 120 species of this fish in the world. This fish contains tetrodotoxin, a deadly poison 1200 times of cyanide.These toxic substances can be found in the liver, kidneys, eyes of thorns in fish body, and fish eggs
If you feel threatened, then this fish will inflate his body as a tactic to protect themselves with poisonous spines. This fish poison is very dangerous and can kill humans within a few minutes. 
White shark is a giant shark that occupies almost all the beaches and oceans. This fish is also dubbed as a killing machine 
Bull sharks are fish that live in calm warm waters, around shore and river estuaries. This shark is the most deadly among other fish that live in warm waters. Not like other fish, it can live in fresh water. This is because the ability of the kidneys that can adapt to the aquatic environment. 
eel electric animals are included in one of the most dangerous fish is enough to terrify humans because able to drain the flow of electricity is strong enough. Fish or eel this one is able to carry electricity with a force of 600 volts. With such great power, they can kill an adult human and certainly other animals. The flow of electricity owned by this fish is as one form of self-defense efforts 
Lion Fish is indeed not look like a fierce fish and agressive.ini is not the type of fish that 'attack' his opponent. But why Lion Fish Lion Fish is entered as one of the most deadly fish, because the Lion Fish is surrounded by thorns of thorns are very poisonous guys! This poison can make for the stung or stuck suffered respiratory failure! Because of this protection, these fish have very few predators. 
this is all I can tell from many deadly fish, next time I will discuss again, thanks if any reading may be useful
