Watch Out Scuba Divers! The Sport’s 10 Most Deadly Sea Creatures

Below, you will find the top 10 sea creatures to avoid when scuba diving, snorkeling, or swimming. Disclaimer: scuba diving, snorkeling, and swimming are all extremely safe water sports! However, there are risks involved in any activity and moray eels happen to be one of them for these sea sports. Thus, you are susceptible to encounter certain dangers under the waves. Altogether, it is best to steer clear of aquatic life! Follow the tried and true saying of touch nothing, take only photos, and leave only bubbles. While there maybe hundreds of poisonous creatures in the sea, the 10 listed below are the most commonly encountered during ocean activities.

10 - Sea Wasp

Sea Wasp

The Sea Wasp is a member of the box jellyfish kingdom and happens to be the most poisonous creature on the planet. This microscopic, translucent jellyfish is quite square with rather long tentacles projecting from each corner. Unfortunately, these tentacles are hard to see due to their coloring. If you are stung by a Sea Wasp, it will cause an immense amount of pain and will likely lead to death. Beaches located along the Northern Coast of Australia are completely closed down during Sea Wasp season.

9 - Stonefish


Stonefish are camouflage masters! While these fish are not aggressive and rarely if ever attack, they contain the deadliest poison found in the sea. Their poisonous stingers are solely utilised as defense mechanisms but watch out for them diligently as they blend seamlessly into the Stonefishes surroundings, whether it be a coral reef or rocky outcrop. Humans have only ever been inadvertently stung by Stonefish, and it happens more often than you think. Be careful.

8 - Blue Ringed Octopus

Blue Ringed Octopus

Blue Ringed Octopus are small but deadly! These poisonous octopi are tiny and sand colored making them pretty hard to spot. However, if our eight legged friends feel threatened in any way, they will display blue rings before administering a painless bite full of potent poisons. Be wary of these deadly octopus as they can be easily overlooked. Plus, the Blue Ringed Octopus bite is so small that rescue personnel often have trouble deducing what may be causing a victim’s pain making it harder to treat this fact acting poison.

7 - Cone Snail

Cone Snail

Contrary to a snail's usual slow nature, the poison within a Cone Sea Snail acts as fast as lightning. The Cone Snail poison is a combination of over a hundred toxins and is administered through a harpoon-like tooth. A Cone Snail sting is potent enough to kill an adult male. Perhaps the scariest part about Cone Snail poison is that no anti-venom currently exists to combat its effects.

6 - Great White Shark

Great White Shark

With over one thousand pounds of muscle and hundreds of razor sharp teeth, the Great White Shark can be extremely intimidating. Great White Shark attacks account for around two thirds of human injuries, however most are not fatal and considered unintentional.

5 - Tiger Shark

Tiger Shark

The Tiger Shark is yet another one of the few shark species that humans need to be aware and cautious of when in the ocean. While this animal is mainly nocturnal, making day divers and beach goers out of harm's way, night divers will need to stay alert in areas populated with Tiger Sharks.

4 - Lionfish


The enchanting Lionfish may be a mesmerizing subject for underwater photographers to capture, but it is also an extremely poisonous animal. The fan-like fins along the Lionfish’s back are packed full of potent venom. Though a Lionfish sting is not fatal, it can be super painful. However, if you are allergic, your reaction to the Lionfish venom will be much worse and can possible lead to death. Lionfish are diurnal as well as nocturnal and attracted to dive lights in the dark, thus it is important for divers to be extremely cautious of the dangerous Lionfish.

3 - Sea Snake

Sea Snake

An Indio-Pacific ocean native, the Sea Snake is a gorgeous white and black striped creature whom is non aggressive. Sea Snake attacks are very rare, but if they are provoked to attack, the poison within their bite can be fatal.

2 - Stingrays


Stingrays come in every shape and size imaginable and are quite the crowd pleaser on diving trips. While stingrays are typically passive animals, who will chose flight over fight when threatened, they will strike when stepped on in the shallows or if captured. Stingrays have barbed stingers located at the end of their tails which administer painful venom when provoked.

1 - Humans

We humans are the ultimate killer of the ocean. While sharks may kill 10 people per year, humans will kill over 100 million sharks per year. Do the math, there is nothing in the ocean killing at the rate that humans kill sea creatures.