Skip to main content

World's deadliest fish some of the most dangerous fish on Earth


Top 10 deadliest fish most feared Sea Creatures

When we think of the most scariest creatures and predators that roam the surface of the earth we think of ferocious beasts like Lion, Tiger, Wolves etc. But what about the creatures that are in our oceans, seas and lakes. Recently, I was watching a show on animal planet, called River Monsters, where some of the deadliest and the most dangerous fishes were shown thriving not only in salty ocean water, but in clean waters like the one we have in our lakes, and rivers. Some of the scariest fish that we know are piranhas, swordfish and the Great White Shark. With its large jaws, this predator is capable of harming the humans if triggered.Usually calm these sea monsters can attack when provoked. Divers, swimmers or people around the coastal areas often face the fury of these marine animals.

This page will show you some of these feared predators from the sea. From the deadliest to the most venomous creatures. Please take this article as a guide to handling fish. Whenever you are fishing or close to water remember there are numerous fishes which are deadly, only a few of them are listed here.

The Stonefish:- Synanceia is fish from Synanceiidae family, also known as the Stonefish. It is one of the most poisonous fish on earth. The Stonefish is found in the coastal regions of the Indo-Pacific oceans. They are mostly found in sea or oceans, at times can also be found in rivers. The deadly neurotoxin in their glands is injected in the enemy through the needle like dorsal fin spines which erect when threatened or suspect danger. Their camouflage is very effective. At times divers have stepped on them thinking they are stones. The Toxin from this fish can cause temporary paralysis and death if left untreated.

Box Jellyfish:- Box Jellyfish are pale blue or transparent in color. They have bell or cube shaped body with four distinct sides hence the name box Jellyfish. Box Jellyfish may seem soft and harmless but they are equipped with venomous stings. Their venom causes acute pain and leaves the person in shock. These Box Jellyfishes are 20cms along each side of the cube or bell and can have 15 tentacles each of which can grow 3 meters in length with up to 5000 nematocysts (stinging cells). The Box Jellyfish shoots itself along up to speeds of 4 knots in a jet-like motion

Tiger Shark:- The Tiger Shark or Galeocerdo Cuvier is one of the species of Shark. These sharks can grow up to 5 meters in length. They are usually found in tropical or temperate oceans. These deadly Tiger Sharks are found near central Pacific islands and are mostly nighttime hunters. These savage predators can eat anything from fish, seal, small sharks and even birds flying above the water. The Tiger Sharks have powerful jaws which they can easily crush a sea turtle or any other marine mammal. They have excellent vision and sense of smell which allows them to find a drop of blood in the football ground.

Puffer Fish:- These funny looking Puffer fish are the second most poisonous vertebrates on earth after the Golden Poisonous frog. The puffer's skin and certain internal organs are highly toxic to humans. Deadly poison called Tetrodotoxin (TTX) is contained Puffer fish. Toxins are more powerful than cyanide resulted in difficulty in breathing on a person before leading to death. Still in some parts of Japan and Korea chef's remove the poisonous part and meat allowing it to be served as meal.

Sea Snakes:- Snakes be it on land or water are deadly. The water snakes have to paralyze their enemies so that they do not run away after once been hit as water allows a good shelter to their preys. An adult sea snake can grow from 120 cms to 150 cms in length, with the largest, Hydrophis spiralis, reaching a maximum of 3 m (9.8 ft).

Moray Eels:- Moray eels mostly live in salt water. They can grow up to 4 meters in length. The body of Moray Eel generally patterned. Camouflage is also present inside the mouth. Their jaws are wide, framing a protruding snout. They possess large teeth, designed to tear flesh as opposed to holding or chewing. Morays hide from humans and would rather flee than fight. Morays are shy and secretive, and attack humans only in self-defense or mistaken identity (for example, a finger placed in a crevice where a moray resides may resemble a prey-item). Most attacks involve accidental bites during human-initiated interaction. Morays cannot see very well and rely mostly on their acute sense of smell.

Stingrays:- Stingrays are inhabitants of shallow water, they have ray shape but are hard to find until they are swimming they usually hide under sand and wait for their prey to come close to them. They can grow large in sizes. They have stingers which have deadly poison in them when threatened these Sting rays attack with these stingers which can reach up to 35 cms in length causing fatal damage.

The sting ray was in news when it stung biologist and host of "Crocodile Hunter" Steve Irwin in 2006. Stingray's tail that is shaped like a spear and contains many toxins, had stabbed Steve and caused him a heart failure. Steve later died due to delay in medical attention.

Lionfish:- A Lionfish is one of the venomous fish which looks beautiful yet dangerous. The Lion fish have long and separated spines and have a generally striped appearance red, green, navy green, brown, orange, yellow, black, maroon, or white. Divers should be extremely cautious and avoid contact with the venomous spikes of the Lionfish. Usually, Lionfish are not aggressive toward humans and will almost always keep their distance. In addition, their stings are not deadly, but they are very painful.

Blue-Ringed Octopus:- Octopus are shown in various mythological books as giant animals bringing down ships. Yes they are dangerous but not to that extent, there are three species of the blue-ringed octopus, all of which live in the Pacific. The Blue-Ringed Octopus are beautifully colored creatures,but are most venomous animals in the world. The octopus usually stays camouflaged, waiting to prey on its preferred dinner of small crabs and shrimp. Provoke it though, and it'll quickly turn yellow and show off its bright blue markings. Then it will sting you and you'll die. Ok, you might not die, but the tiny octopus carries enough venom to kill 26 adults in its body. The most dangerous effect of its venom is respiratory failure. If you're stung by the octopus, you're probably going to need rescue breathing until you can start to breathe on your own, which might not be for several hours.

Sea snails:- Snails found in salt water and some in rivers are venomous too, probably the most poisonous the reason being that these creatures are slow and most of their prey are fast if the venom is not quick in paralyzing the prey it can run away. Recently the venom is being used as a painkiller. Sea snail venom consists of a cocktail of peptides, known as Conotoxins. These act to immobilise prey by blocking nerve-cell conduction, but in mammals the peptides are an effective analgesic.

For more facts about these deadly fishes visit the Australian fishing site


Deadly Stone fish

Check the venomous spikes on the deadly stone fish the deadliest fish in the world

Blue ringed octopus

Small but dangerous the deadly blue ringed Octopus is here in this video

Scroll to Continue

Moray Eel Vs Scorpion fish

A deadly Moray Eel eats up a Scorpion fish

Readers Feedback

Thomas Davis on May 04, 2015:

I think you should try Goonch,Gar,Hag fish,and viper fish,and greenland sharks.

mogalog262 on June 23, 2014:

Ugly looking yet deadly lol

miniml05 on May 20, 2014:

ahh i hate eals and rock fish my sister allmost step on one

cnjihianjihia on December 05, 2013:

These fish are really creepy looking

marriemb lm (author) on November 19, 2013:

@anonymous: who was it.

anonymous on August 11, 2013:

I kno some one who lived after getting attacked by a box jelly

anonymous on July 26, 2013:

@marriemb lm: you are babita

anonymous on June 26, 2013:

i'm scared 2 step on rocks near after a high tide :/

anonymous on June 21, 2013:

Wow... Scary fishies

marriemb lm (author) on June 03, 2013:

@anonymous: haha you are right we should call discovery channel and ask them to set the rules

anonymous on May 29, 2013:

There should be a rule that nothing smaller than us can kill us....there'd be a lot less anxiety in life.

anonymous on May 26, 2013:

ii thought u wud add goliath tiger fish ... :/ ... but great

anonymous on April 16, 2013:

Now I'm kinda scared to step on rocks...

anonymous on March 04, 2013:

Thank you now I now all the animals in the water I must avoid!!

Who does this sound like OH MY GOD YOU ARE UGLY!!!

anonymous on February 28, 2013:

Great info, Interesting things I didn't know about the world I live in : )

anonymous on February 25, 2013:

Awesome pics I never thought stonefish were dangerous

marriemb lm (author) on January 30, 2013:

@anonymous: thank you

anonymous on January 23, 2013:

nice job

marriemb lm (author) on January 15, 2013:

@anonymous: haha yes it looks annoyed

marriemb lm (author) on January 15, 2013:

@anonymous: Thanks for the positive comments romme my purpose of helping others has been served.

anonymous on January 04, 2013:

This is a good site for i know what kind of fish will must avoid.

anonymous on January 04, 2013:

@anonymous: I think that moray eel has issues.

marriemb lm (author) on January 02, 2013:

@anonymous: thanks for the encouragement

marriemb lm (author) on January 02, 2013:

@anonymous: ok thanks will change the name

anonymous on January 02, 2013:

Do not listen to all the negative criticism! It must b hard for you to write during office hours and I aappreciate people like you taking time to write about what they enjoy. I personally enjoyed it, good job! Yes, there were a few errors but hey, we r all human! Keep up the good work :)

anonymous on December 23, 2012:

That pic is a lions mane jellyfish not a box jellyfish

marriemb lm (author) on December 19, 2012:

@anonymous: Thanks for the support Poprod world of internet is filled with such people who are busy criticizing others

anonymous on December 19, 2012:

The feature is obviously written by a non English speaking person, who has done an excellent job considering. As for DPth1, better to check your own spelling before you start criticising others!

anonymous on December 04, 2012:

Is this article a joke? There's grammatical errors in virtually EVERY sentence! It looks like someone stole their 6th grader's homework and put it up online as their own work

marriemb lm (author) on November 30, 2012:

@anonymous: Thanks for the generous reply Joshy, there could be some minor, grammatical mistakes, though I never found time to rectify them.

anonymous on November 29, 2012:

Good info, i enjoyed reading it. However, some of the people are correct, there were a few grammar mistakes.

Cbosdicun, you need to watch your mouth, because i am one of those peeps who would report you just for the heck of it.

anonymous on November 16, 2012:

Terribly written. Your English is appauling; I can just see a tiger shark thrashing about on a football pitch trying to find that illusive drop of blood. Also there is no evidence of them ever catching flying birds.

anonymous on November 04, 2012:

@marriemb lm: Wow...You can't even write one sentence without screwing up your grammar. Please focus on your 5th grade english rather than writing terrible articles.

anonymous on November 02, 2012:

this was an incredibly poorly written article. learn to write please.

marriemb lm (author) on October 30, 2012:

@anonymous: ok sir u 2

i wonder how i can report commenting users like you so you get blocked from squidoo for life

anonymous on October 29, 2012:

shut the fuckup

marriemb lm (author) on October 28, 2012:

@Thamisgith: glad you liked it thamisgith

marriemb lm (author) on October 28, 2012:

@anonymous: yup you are right jwaters, it is the discovery channel and the movies like Piranaha which have depicted them as evil monsters, they are just small fishes which attack in group a lone fish won't be that harmful

anonymous on October 28, 2012:

@Ilovesquidoo12: I think its because most species of piranha only attack ppl in extreme circumstances, so in that regard, they are not dangerous.

Thamisgith on October 20, 2012:

Cool lens. thanks for sharing.

anonymous on October 13, 2012:


marriemb lm (author) on October 12, 2012:

@Ilovesquidoo12: I will get it in the list soon though you are right there are many other deadly fishes in water i will pour some more information here.

Ilovesquidoo12 on October 11, 2012:

Why isn't piranah in there

anonymous on July 30, 2012:

this is moistttt

marriemb lm (author) on July 28, 2012:

@anonymous: rather than encouraging people to write more, readers like you are a disgusting and annoying.

marriemb lm (author) on July 28, 2012:

@anonymous: for those readers who have been in the state of ambiguity whether it is fish or fishes I would recommend them to see the oxford dictionary

fishes can be used when referring to various species of fish

anonymous on July 27, 2012:

@anonymous: jeeesus christ! i hate reading these articles, not cos of the articles, because of all the bloody grammar-police. write it yourself then moany-ass tsk

anonymous on July 27, 2012:

@anonymous: they are not that excited by human blood though, so the fact that they can smell blood from miles away, is pretty irrelevant if your a human. just try not to look like a seal, turtle, car tyre, owt a tiger will eat

anonymous on July 27, 2012:

@anonymous: nah, its fishies lol

anonymous on July 23, 2012:

I think you meant they can smell a drop of blood in an area the size of a football field

anonymous on July 22, 2012:

amazing videos

marriemb lm (author) on July 15, 2012:

please read the other articles and rate them too :)

anonymous on July 15, 2012:

Sadly, a poorly written article with a boatload of grammatical errors. To me it seemed like this was written by a 13 year old. Proof reading would be in order. While the article can be understood, the errors make it relatively annoying and shows poor work ethic.

anonymous on July 10, 2012:

By the way, the plural for 'fish' is 'fish', not 'fishes'. Idiot.

anonymous on July 10, 2012:

I wanted this article to be interesting, and I think it could've been. The content is interesting enough, anyway, but the writing is just awful. Whoever wrote this, you should be embarrassed.

anonymous on July 10, 2012:

@marriemb lm: If you wrote this article & others like it during office hours for a different job, then you probably aren't giving either the full attention they both require. I agree with the poster above, attempting to read through the list with the various grammar, spelling, and punctuation errors was beyond ridiculous. If professional writing is your goal, you had best work on it. No one will take you seriously until you do.

marriemb lm (author) on July 03, 2012:

@anonymous: i will try to be more accurate next time though writing these articles during office hours is always a challenge

anonymous on July 03, 2012:

Honestly the grammar made it challenging to follow.i hope other lists are written better

anonymous on June 18, 2012:

I once fished a teenage tiger shark out of the bay! Surprising for me! Looking for other fish!

anonymous on February 09, 2012:

walking on the beach rootootoo

anonymous on November 28, 2011:

I hate stone fish


anonymous on August 02, 2011:

i thought it was excellent but agree that you not have put that photo there of the girl holding the fish. . .

and thought that the humor about the blue ringed octopus was chessy somewhere beteween jalepino and cheddar but in all great article!

anonymous on April 26, 2011:

@marriemb lm: Overall, the information and data was organized perfectly and was absolutely fabulous. Except for one thing. I am still not sure and comfortable why you put the picture of a woman holding a fish. It just doesn't fit into the marine creepy and "deadly" atmosphere.

anonymous on April 23, 2011:

@marriemb lm: marriemb, What's your real name? I need it for my project.

savagepriest lm on August 15, 2010:

@marriemb lm: great post some of them are really scary

marriemb lm (author) on July 30, 2010:

@AmericanDreamer1: Thanks AmericanDreamer I will try to make those changes :)

AmericanDreamer1 on July 30, 2010:

An enjoyable read. And very informative. I would note that as most of these creatures are not actually fish, perhaps "World's deadliest sea creatures" might be a more appropriate title.

There are also a couple other things I would note, such as sea snakes being amongst the worlds most venomous snakes. You say that they are poisonous, but I feel that people might get a bit of a better respect for their poison if you show how they compare to some of the more well known snakes out there.

Also, you state that the stingray was in the news when it stung Steve Irwin, but you leave out that it in fact killed him (May he rest in peace, he was a great man) which I think is important.

All in all, it is a great lens which just needs a little fine tuning and could use a few more facts here and there. I very much enjoyed reading it :)

Related Articles