The world’s oceans are filled with interesting, strange, and outright unbelievable animals. Some of these are capable of inflicting incredible pain that may lead to paralysis, respiratory failure, and death.
Often, the most dangerous creatures are the most beautiful ones. The striped pyjama squid and nudibranch are only two examples of poisonous ocean animals that you should steer clear of.
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Striped Pyjama Squid
How Poisonous? One of the most poisonous cephalopods in the ocean.
Habitat: The southern Great Barrier Reef, central south Australian Coast.
The striped pyjama squid is also known as the striped dumpling squid. It’s one of the most poisonous ocean animals (in fact, it is both venomous and poisonous). It lives on the sea floor and grows to be around 8 centimeters in length. When these unique creatures are born, they are as small as 10mm.
The squid can disguise itself by changing its appearance. This allows it to hide from potential predators by camouflaging with the surrounding environment.
It is one of the only poisonous cephalopods in the ocean. It produces what is saliva from small glands under its skin. They can be found in the southern Great Barrier Reef and along the central South Australian coast.
Portuguese Man o’ War
How Poisonous? Their sting is very painful but rarely fatal in humans.
Habitat: Throughout the world’s oceans.
The Portuguese Man o’ War is one of the more interesting species found anywhere in the world’s oceans. It is highly poisonous, despite its small size, and can be found floating gently in the ocean’s current or sometimes washed up on shore. They bear a resemblance, or some thought, to 18th-century Portuguese warships in their unique cluster of organs.
If you’re exposed to a Portuguese Man o’ War, the venom-filled tendrils can cause a great deal of pain. But luckily, they are rarely fatal for human beings. For small fish that the Portuguese Man o’ War preys on, it’s a very different story.
Nudibranch
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How Poisonous? Depends, they store and reuse toxins from their prey.
Habitat: Throughout the world’s oceans.
The nudibranch, or sea slug, lives in tropical ocean waters. In total, there are over 3,000 species of nudibranchs distributed around the world. They store toxins from the foods they consume and then use those toxins on predators.
Nudibranchs vary in appearance. Some shades of white others are incredibly colorful. They also vary in size from 0.16 inches to 23.62 inches. The Glaucus Atlanticus, or blue glaucus, is a very good example.
Blue-Ringed Octopus
How Poisonous? One of the most poisonous creatures in the world.
Habitat: From the Sea of Japan to Australia and from the Philippines to Vanuatu.
The notorious Blue-Ringed Octopus is another very poisonous ocean animal. It contains enough poison to kill up to 20 people! It lives in tide pools in the Pacific and the Indian Ocean. Luckily, they are very easy to recognize. These small octopi have yellow skin and blue and black rings.
Some scientists consider the Blue-Ringed Octopus to be the world’s most dangerous animal. If stung, one’s body will go into shock and total paralysis. There is no antivenom.
Boxfish
How Poisonous? It excretes toxins into the water around it and poses little real danger to humans.
Habitat: Coral reefs around the world.
The boxfish, like the pufferfish, is a poisonous ocean animal. It excretes a toxin into the water around it in order to fend off potential predators. They are usually bright yellow in color with dark, black spots. They only reach around 18 inches, or 45 centimes, in length and have a unique box shape. Their interesting coloring is read by predators as a warning sign to stay away.
Pufferfish
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How Poisonous? Poses a real danger to humans if it is eaten.
Habitat: Throughout the world’s oceans.
When you think of poisonous animals, you probably think of pufferfish or blowfish. These unique species can inflate themselves when threatened and are also very poisonous to eat. The toxins in puffer fish are around 1000 times more poisonous than cyanide.
Despite this, there are restaurants, especially in Japan, that prepare and serve puffer fish as a delicacy. Only licensed chefs, known as fugu chefs, or allowed to prepare this potentially deadly sea creature.
Marbled Cone Snail
How Poisonous? It can cause paralysis, respiratory distress, and death.
Habitat: Throughout the world’s oceans.
This small colorful snail is capable of inflicting serious damage that can lead to paralysis, respiratory failure, and then death. It’s diminutive size and colorful appearance are incredibly misleading. They only grow to be between 30 and 150 mm.
Unfortunately, there is no single anti-venom on the market for marbled cone snail stings. But, there are treatments victims can receive in order to lessen the toxin until it wears off. They are found along the southern tip of India, New Caledonia, and Samoa.
Flamboyant Cuttlefish
How Poisonous? Its flesh is filled with acid and is dangerous for humans if eaten.
Habitat:The Indo-Pacific Ocean
The interestingly named Flamboyant Cuttlefish, or Metasepia pfefferi, is a very poisonous ocean creature that is multicolored and very small. They are found in the Indo-Pacific Ocean and are thought to be, at times, as poisonous as a blue-ringed octopus.
Unlike other animals on this list, the cuttlefish is unsuitable for consumption. The flesh is filled with acid.
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