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The Most Dangerous Creatures of the Sea

As quiet as the sea may seem, you should keep in mind the dangers lurking beneath the surface. Here’s a look at the deadliest creatures living in the water.




Members of the Scorpaenidae fish family, the Lionfish are native to the Indian and Pacific oceans but various species can be found all over the world. Also known as the Turkey Fish or Dragon Fish, it has long poisonous spines that are deadly to many marine creatures. The Lionfish sting is not usually deadly to humans but it will cause severe pain, headaches and vomiting.

Lionfish don’t attack people unless provoked, but in case you get stung you should immediately soak the area in hot water and seek medical help.




The Stonefish is a master of camouflage, which makes it even more dangerous, as people often get to close without realizing it. They can be found on the sea bottom and around coral reefs, disguised as rocks. The Stonefish is the most poisonous fish in the world. It has 13 spikes on its back, all filled with extremely potent, protein-based venom. Depending on how deep the sting is, this venom can kill a person in a few hours unless he receives medical attention.

Getting stung by a Stonefish causes excruciating pain, shock and paralysis. Surviving victims of Stonefish encounters have been known to suffer nerve damage which leads to muscle atrophy.

Sea Urchins

Sea Urchin

Sea Urchin

No one in his right mind would get close to anything as spiny as a sea urchin, but walking in the water makes it easier for people to step on them. Sea Urchins have long sharp spines that penetrate very deep and sometimes break, causing severe pain and infection. In most sting cases, the spines have to be removed surgically.

Not all Sea Urchins are venomous but one of the most dangerous, the Flower urchins can be deadly. It looks like its body is covered by flowers instead of thorns, but they are in fact venomous and can cause paralysis or, even worse, death. There have been several reports of people killed by Flower Urchins around Japan.




They may look innocent and peaceful with their cute little whiskers, but Catfish are dangerous creatures if provoked. When it feels threatened, the Catfish pulls out three barbed spines from its back and side fins. They are venomous and cause severe pain. Although rare, throughout the years there have been cases when catfish attacks proved deadly.

Catfish venom remains active for several days after the fish dies so even refrigerated ones must be handled with care.

Box Jellyfish

Box Jellyfish

Box Jellyfish

Often referred to as the Box of Death, the Box Jellyfish is indeed one of the deadliest sea-creatures on earth. It has up to 60 tentacles which can be even 5 meters long and have 5,000 million stinging cells. It’s enough for a full grown adult to come in contact with just 3 tentacles to risk death. Box Jellyfish are very fragile organisms, even a small fish could tear through it like butter, so it needs to kill aggressors and its food at first contact.

Box Jellyfish are so dangerous because they frequent a number of very popular beaches and because of their translucent bodies they are extremely hard to spot.




Just like crocodiles, sharks are perfect killers in the water, just seeing them on television makes everyone’s heart beat a little faster. But, contrary to popular belief, sharks don’t usually attack unless provoked, most species don’t attack humans at all.

The best way to avoid a shark attack is to stay away from shallow waters where sharks are known to be feeding in, that’s the most common mistake people make, they ignore warnings and end up having their limbs bitten off or even worse.




Not many people really knew how dangerous stingrays really were until the terrible accident in which Steve Irwin lost his life. The truth is stingrays kill a lot more people than sharks for example. They are not aggressive creatures and when attacked, most of the time they just flee, but when stepped on, stingrays whip their tail stinger.

A way to avoid getting pierced by this dangerous weapon is to slide your feet through the sand instead of actually stepping, this way the stingray detects you and runs away.

Photo credits: 1, 2, 3, 4, 5, 6, 7

41 Comments for "The Most Dangerous Creatures of the Sea"

Bella says on March 16th, 2009 at 3:21 am:

This website was very cool !! I enjoyed learning about dangerous sea creatures:-) Now I know what animals not to go near !! funny, funny!! Fun website too, I have been looking at this website for the past hour :) !!

margarita says on April 18th, 2009 at 11:16 pm:

they look pretty scary

jamal rolle says on April 27th, 2009 at 7:26 pm:

this website is soawsome and scary

mark says on May 25th, 2009 at 3:30 pm:

its really weird to know that this jelly fish though fragile are the most dangerous at least for me…… good stuff

josh says on June 10th, 2009 at 9:33 pm:

i did not know catfish are dangous.

Survivor says on June 15th, 2009 at 7:10 am:

I was stung by a sea urchin today and I must say the pain was very drastic. I hope that no one else has to feel it because it will hurt for hours to come

Animal Lover says on June 28th, 2009 at 8:25 pm:

Let’s exterminate all of these animals quickly! Think of the children.

caitlin says on July 21st, 2009 at 4:22 am:

ummm the deadliest posinous animal in the world is the sea snail

anonimous says on August 2nd, 2009 at 12:52 am:

where are the orcas, these killers are the most intelligent creatures on the sea, they can habit any area of the worlds sea and have lots of methods of hunting that not even the sharks can do,like using bubbles to provoque fishes and go to stremely shallow water without getting stuck (sory if my english is not so good boys xD im brazilian and dont like your language too much hehe)

sam says on December 6th, 2009 at 8:21 pm:

The 10 Most Dangerous Animals On The Planet

Jetfire's my name says on January 5th, 2010 at 12:32 am:

You do know that you forgot a dangerous sea animal. The blue ringed octopus should have been included in the list. It is THE MOST deadly octopus in the world, not the most deadly sea creature. Anyways if you would have included the blue ringed octopus, it should be number2 or 3. Who put you on the planet?

ace says on January 25th, 2010 at 1:41 am:

i think the angler fish should be on the list

someone says on January 28th, 2010 at 8:09 pm:

dude those r like not the top 10 omg jst on the coast of australia itself has like 20 mor different ones nd yes how culd u 4get the blue ring

bali products says on March 8th, 2010 at 8:32 pm:

Bali average temperature in the costal areas, something like 28ºC during May, June, July; nearly 30ºC in March and October.

Zoey says on March 15th, 2010 at 2:41 pm:

This website was cool i needed things for my project and got everything****

Remedios Fassio says on March 20th, 2010 at 12:14 am:

How ya doing? You picked the ones closed to my heart too, despite the fact I know I am guilty of #1 when I don’t pay attention.

John says on March 21st, 2010 at 4:11 am:

How about they all live? They were here first so all you people saying they should die are really really stupid.

Nicole says on April 1st, 2010 at 6:35 am:


queque says on April 5th, 2010 at 12:36 am:


Ranom Guy says on April 16th, 2010 at 7:45 pm:

I went to turtle bay and saw hundreds of pencil urchins. I swam like hell.

Kieran says on April 23rd, 2010 at 3:17 pm:

This iscompletely incorrect, the only two organisms which should be on the list are sharks and the box jellyfish as these are the only ones which often lead to death

Andrew says on June 29th, 2010 at 4:37 pm:

Theese animals should be approched with extreme caution

EMMANUEL says on July 2nd, 2010 at 4:54 am:

OMG! I’m scared to death. Thank God i can’t swim so i’ve no business wit the sea.

Blaine says on July 2nd, 2010 at 11:20 am:

“Kieran says on April 23rd, 2010 at 3:17 pm:
This iscompletely incorrect, the only two organisms which should be on the list are sharks and the box jellyfish as these are the only ones which often lead to death”

Way to be wrong, technically all of these can lead to death…

Leon says on July 31st, 2010 at 3:56 am:

these animals will soon kill someone

shaz says on August 29th, 2010 at 8:18 am:

I enjoyed learning about dangerous sea creatures.. This website is so awsome.. ^^

nimadanig says on August 29th, 2010 at 11:37 pm:


Vonnieboo says on September 2nd, 2010 at 8:43 am:

I recently moved to Hawaii~ I love the ocean and beach!! But this site and the comments def scares me!!!!

tetra897 says on October 16th, 2010 at 2:48 am:

im going on atrip to hawai i printied a sheet just incase

Dank says on November 18th, 2010 at 5:55 pm:

Think of the Children? if your letting your children swim in waters near these it shouldn’t be the animals fault its yours.

Marky says on May 13th, 2011 at 11:36 pm:

What the…? No giant Pacific octopuses? What the heck is going on here?

jambita tiny says on July 2nd, 2011 at 1:21 am:

what about the killer whales and the octopus? The octopus has the capability to kill even sharks, so why did you leave it out?

Littleguy says on July 8th, 2011 at 12:39 pm:

Maybe They’re Are Lot’s Of other dangerous sea animals , but they just knew These ones better

Deeniti says on May 17th, 2012 at 7:42 am:

Very scary

umair butt says on October 31st, 2012 at 4:38 am:

i think shark fish is very harmful and dangerous. some people play with this fish so pl z avoid this fish and save your life

Donald says on January 16th, 2013 at 8:31 am:

Interesting animals :) whoever say let exterminate them should think of exterminating their own firstly, every livin creature plays a major part in the eco system, these animals don’t do ne1 anything unless provoke, unlike we humans who kill, rape, rob, kidnap, abort our children an so on bcuz of pure wickedness, the most destructive things in this world today is us humans so before sayin terminate anything, we must consider ternating ourselves 1st, many animals an evn places have been destroyed bcuz of humans, evn earth are being destroyed slowly bcuz of humans, now who’s worse?

your mum says on February 5th, 2013 at 2:06 am:

^_^ (-_-) :) :( :’( :P :D :O :=) XOXOXOXOXOXO

starnlybest says on February 17th, 2013 at 8:13 am:

obviously the sea is safer to a fact that none of these sea animals are as poisonous as the black widow spider on land.

Chels says on August 31st, 2013 at 12:09 pm:

Sorry; not all sharks are dangerous. The bull shark can be lethal, with it living in salt and fresh water but most sharks are just misunderstood and taken for killers.

Chels says on August 31st, 2013 at 12:11 pm:

Also, killer whales aren’t dangerous! They’re quite a safe mammal, they’re also part of the dolphin family.


  1. Paul Santiago

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