List of Deadly Jellyfish that You Should Know

The vast ocean is never failed to impress me. It’s the largest home for every kind of sea creatures that live inside it. There are various deep ocean creatures and they will take you into the new kind of experience.  The life cycle in the ocean is also fascinating. Most of us are familiar with the information that shark is the most feared sea creatures, no doubt about it. But we are not talking about those fearsome sharp teeth mammals in here because we will discuss about the least recognized sea creatures but it also very dangerous known from its painful sting. It’s a Jellyfish.

1. Irukandji


Irukandji jellyfish is probably the tiniest jellyfish ever discovered in the world. Despite from its tiny appeareance, the sting from its nematocyst are extremely strong and it will give you the worst nightmare in the real life. The sting from this jellyfish is known as the Irukandji syndrome which can increase the blood pressure and heart rate. This species can be found throughout the Australian coastal but it also reported that this sea creature is found in Florida, Japan and the recent discoveries spotted this jellyfish around Malaysia. Although it’s nearly invisible due to its tiny and crystal clear appearance, it’s better to stay away with this creature.

2. Blue Bottle Jellyfish

Blue Bottle Jellyfish

This creature is often mistaken as a jellyfish,  It’s easy to recognize from its blue colored body, but some of us including me, are not aware that this living organism is the dangerous species. The natural habitat from this creature is located at the ocean surfaces. The Portuguese man’o war is their other name. This creature can give you an excruciating pain from its sting. If you or your relatives ever saw this creature wandering around the ocean, you need to stay away from the water. If you are unlucky enough to get stung by this creature, the first thing to do is to remove its remnants from the skin carefully. Do not use your bare hand otherwise you can get the secondary sting. Apply salt water to the infected skin or area, do not use a vinegar or gasoline because it can make the symptoms are worse. Some say, although it’s not clinically proven, a human urine is the best first aid to ease the symptom.

3. Fire Jellyfish

Fire Jellyfish

Fire Jellyfish or Morbakka fenneri can be discovered in the Queensland coastal area. The physical body appearance of this jellyfish is slightly larger than the ordinary jellyfish. The fire jellyfish can be seen from their pink colored body with their four inches body length and their bell is two-inch in diameter. Their stings are also painful, but it’s not as worse as the other previous jellyfish.

4. Sea Wasp

Sea Wasp

The reason why this jellyfish is dangerous is, they are likely discovered in the ocean nearby. The venom from their stings was so painful yet strong and it can kill a human in instance. They are located in Vietnam, Philippines but this species are abundantly located in the Australian continent and coastal areas. According to the victims, the Sea wasp or Chironex fleckeri sting can leave an excruciating burning pain. Without proper and immediate aid, the victim can be killed in just two or five minutes. The first aid for the first stage of sting is to carefully remove the tentacles and give the antihistamine and ice pack to them. If you ever found the worst stage of sting, a CPR method needs to be done and immediately take them to the hospital or medical facilitation nearby. The deadliest yet unique aspect from this venomous tentacle is, it can quickly dried after removed from the skin but it can be active again when exposed with water.

5. Alatina alata

Alatina alata

They are occupant sea creatures in the Arabian, Hawaii and Pakistan seas and coastal area. The sting from this jellyfish is similar with the Irukandji syndrome.  The venom can distribute through your blood and lymph. Unlike the Portuguese man’o war sting treatment method, the usage of vinegar is recommended for ease the pain and prevents the venom to spread further through the victim’s body.  To reduce the accident, we need to place the signboard nearby the beach to warn the tourist.

6. Chiropsalmus quadrigatus

Chiropsalmus quadrigatus


This is the smaller version of the box jellyfish or Chironex fleckeri. This species can be discovered along the Western Atlantic and Indo-Pacific. In their four side of body, lies a long appendage measured in eight inches in length.  They are hunt for fishes using their tentacles. Their worst sting is reported can lead to cardiac failure for human being.

7. Lion’s mane jellyfish

Lion’s mane jellyfish

In contrary with the others jellyfish that are already mentioned before, the Lion mane’s jellyfish is the huge species of all jellyfishes. They can grow (along with the tentacles) up to 35 m and weighed for 500 pounds. They prefer to live in a coldwater of United Kingdom, North Atlantic and Australian coastal areas.  The sting from this jellyfish can deliver a red mark in your skin and of course it’s painful as well. If you ever happen to get stung by this jellyfish, vinegar can be the best solution to prevent the venom spreading to your body.  An immediate action of medical treatment in the hospital are also required if the symptoms are worse.

8. Sea Nettle

Sea Nettle

This jellyfish is a little bit smaller than our previous species. This carnivorous sea creatures hunts for other jellyfishes. They use their venomous tentacles to stun their prey and slowly devour them in the center of their body where their teeth are located.  Another usage of their tentacles instead for hunting is also for a defense mechanism. There is thousands of nematocyst on each tentacle. Their sting could stand for more than thirty minutes.

9. Australian Box Jellyfish

Australian Box Jellyfish

Their color is light blue with the lifespan less than a year and their maximum weight is about 2 kg. This jellyfish carries almost twice than 2.500 cells capable for stung their prey. Unlike the other jellyfish, The Australian Box Jellyfish can move by themselves which can make them the most advanced species of jellyfish.  Their sting is neurotoxin and paralyzing the human.

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