box jellyfish

The animal kingdom is vast and full of magnificent species, from microscopic sea creatures to terrestrial giants. These animals are beautiful, wild and some of them extremely dangerous. The laws of nature are cruel and only the strong ones survive. We have showed you a list of the deadliest reptiles in the world and now it’s time to move underwater and share with you 10 deadly sea creatures that are dangerous to humans. They bite, they sting and some of them are extremely poisonous. Some of are very beautiful while others are plain scary. Here they are:

10. The Striped Surgeonfish

striped surgeonfish

Don’t be fooled by the beautiful colors of this fish. Its caudal spine is very venomous and should be handled with care. There are over 1,200 species of venomous fish in the waters and it’s believed that there are about 50,000 people injured by these dangerous fish every year. The good news is that the venom collected from these deadly sea creatures is useful for developing new medical drugs.

9. Barracudas


We’ve all seen movies with this dangerous fish. Barracudas are truly killing machines, with their long bodies and razor sharp teeth. They can reach speeds of over 40 km per hour and have been around for more than 50 million years.

8. The Yellow Sea Anemone

yellow sea anemone

This strange creature may be mistaken for a beautiful sea flower but the yellow anemone is actually a very dangerous marine creature. It’s closely related to jellyfish and corals and has venomous tentacles that stab the victims, paralyzing them with a powerful neurotoxin. If you ever go swimming in the tropical reefs make sure you watch them from a distance.

7. The Moray Eeel

moray eel

On our list of deadly sea creatures, the Moray eel is also one of the scariest. It lives in the waters of Kona, Hawaii and it possesses 2 sets of teeth:  a normal jaw and a second set of teeth in the eel’s throat that actually comes out of its mouth to grab the prey. This  helps the eel catch large fish without opening its mouth wide.

6. Indonesian Needlefish


The needlefish usually lives near the surface of tropical waters. But they can jump out of the water and become very dangerous, acting like flying knives. People have been seriously injured by this fish’s sharp jaws, with night fishermen usually being at risk because the lights can attract the needlefish, making it jump out of the water.

5. Oyster Toadfish

oyster toadfish

Another scary-looking sea creature is the oyster toadfish. It has a very big head and a powerful large mouth that crushes the tough mollusk shells. Their favorite menu includes oysters, shrimp, crabs and fish. An interesting fact about this fish is that they guard their nests and watch over their young in the first weeks of their life.

4. Textile Cone Snail

textile cone snail

This snail is one of the most toxic creatures on the planet. They harpoon their prey using their hollow teeth and then they kill it with a deadly dose of venom. They mostly eat mollusks and have been known to be cannibals, eating their own kind when there’s nothing else to eat.

3. Deadly Sea Creatures – Fire Coral

fire coral

Scuba divers know better than to get too close to these beautiful but deadly sea creatures. The fire coral is a distant relative of anemones and jellyfish and they can deliver a very painful sting with its tentacles. Although they cannot kill a human being, it can cause severe pains , nausea and vomiting.

2. Blue-Ringed Octopus

blue ringed octopus

This small sea creature is no more than 8 inches but its venom is so powerful that it can kill almost 30 people in just a few minutes. The blue-ringed octopus’s venom is 10,000 times more powerful than the cyanide poison.

1. Box Jellyfish

box jellyfish

When it comes to deadly sea creatures, the box jelly fish or the chironex takes the crown. It’s considered to be the most dangerous creature in the ocean and it’s responsible for more human deaths than sharks and snakes. The box jellyfish, also known as the sea wasp, uses its sting to inject a highly toxic venom that is very painful and fatal to humans.

Other deadly sea creatures worth mentioning are:

The lion fish, the sea snake, stingrays, stonefish, sharks, puffer fish, billfish, killer whales.

This was our list of deadly sea creatures that are very dangerous to humans. If there are any other water creatures that should be on our list, let us know in the comment section below.