17 Most Dangerous Fish in the Pacific Ocean

By Krystal Brown

While the ocean is full of many beautiful creatures, it’s also full of some very deadly ones. Here are 17 of the most dangerous fish in the Pacific Ocean.

Great White Shark

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Great white sharks are incredibly powerful and are known for striking when you least expect it. Great whites are known, in areas where they’re the most prevalent, for attacking swimmers, divers, surfers, kayakers, and some small boats.

Moray Eel

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The moray eel is a predatory fish. Its sharp teeth contribute to its powerful bite, which can cause serious injuries. Some are poisonous. They’re often found on coral reefs and rocky coastlines.

Tiger Shark

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Tiger sharks are known for hunting close to the shore and eating anything. They attack many people each year. They’re second only to great white sharks when it comes to their human attacks.

Box Jellyfish

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Box jellyfish are among the most poisonous in the ocean, and their stings can be fatal. They cause more deaths in the Indo-Pacific region than any kind of shark. Their cube-shaped bell and long tentacles, which feature nematocysts, make them easily recognizable.

Sea Snake

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Sea snakes are very poisonous, and their bites can be deadly. Their initial bite may not hurt, but their venom can still be fatal. They spend most of their lives in the water, so you aren’t likely to find one on dry land.


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Lionfish stings are known to cause serious pain, vomiting, and breathing difficulties. Most of the time they aren’t fatal, but they can be especially dangerous for children and the elderly.


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Stonefish are the most poisonous fish in the world. They are camouflaged on the ocean floor, making it especially dangerous for anyone swimming in the Pacific Ocean. There is anti-venom available, but it must be administered immediately for any effect.

Oceanic Whitetip Shark

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Oceanic whitetip sharks were known for attacking shipwreck survivors in WWII. They’re very dangerous, with a bold nature and great presence in open waters. The number of recorded deaths from these sharks typically outnumbers sharks with worse reputations.


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Pufferfish contain neurotoxins that can be lethal. Considered a delicacy in Japan, they can be fatal if not prepared and consumed properly. They’re typically prepared by a trained chef to ensure their safety.

Humboldt Squid

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Humboldt squids are known for their aggressive nature toward other species and humans. They may not look threatening, but they are considered dangerous predators. They can grow up to over 6 feet and are typically found inn the eastern part of the Pacific Ocean.

Blue-Ringed Octopus

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The blue-ringed octopus is small in size, but it’s very deadly. Their venom is strong enough to kill humans, and there’s no anti-venom available. This octopus is easy to identify because it releases bright blue rings when it feels threatened.

Crown-of-Thorns Starfish

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This starfish produces toxic slime. Their spines are covered in plancitoxins that can cause liver damage. The crown-of-thorns starfish prey on coral polyps and can cause major reef damage.

Salmon Shark

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The salmon shark is found in the northern part of the Pacific Ocean. Closely related to the great white shark, salmon sharks are known for attacking fish and seabirds. They’re not considered a major threat to humans, as they most commonly eat salmon.

Mako Shark

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The mako shark is one of the fastest sharks on the planet and is known for its agility in open waters. It rarely attacks humans, but its attacks can be very severe. The mako shark is often found not only in the Pacific Ocean but also in tropical waters.

Bull Shark

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Bull sharks are considered the most dangerous sharks in the world. They’re very aggressive and tend to hunt in waters where people swim, such as tropical shorelines. They are known for attacks near shores and can also travel up rivers.


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Barracudas are found in the warmer, tropical waters of the Pacific Ocean. They are fast and have sharp teeth. Although attacks on humans are rare, they can attack swimmers and divers–especially if they have something shiny on them.

Hammerhead Shark

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With a head shaped like a hammer, the hammerhead shark’s head enhances its sensory perception. It’s not typically considered dangerous to humans, but it can cause some serious harm in an attack.

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