Big Blue Diving - Koh Tao - Thailand - 20 Weird Jellyfish Facts
Saturday, 30 June 2018 15:05

20 Weird Jellyfish Facts Featured

Written by
Rate this item
(1 Vote)

So it appears that after spending hours reading about the wonders of Jellyfish for my last blog that I've become hooked on these little wobbling warriors, and with so many different types there's a lot of pretty bizarre facts out there about our little stinging friends. Here I present you with my favourite twenty, hope you enjoy them!

 Jellyfish are NOT actually fish, as they are invertebrates

  • Jellyfish have no brain, heart or bones or central nervous system, and just roam the ocean looking to sting and absorb prey – basically they’re ocean zombies.#
  • If a jellyfish is cut in two, the pieces can regenerate and create two new organisms.
  • If a jellyfish is injured, it may clone itself giving the opportunity to produce hundreds of little baby jellyfish!

  • Despite what a famous episode of ‘Friends’ tells you, you should never pee on a jellyfish sting, as it can actually aggravates the stingers causing more pain.
  • Jellyfish have been swimming in our oceans for over 600 million years, making them older than dinosaurs.
  • There are nearly 4,000 different types of jellyfish in the world with hydrozoa jellyfish accounting for at least 3,700 of them.
  • Jellyfish are between 95 and 98 percent water.

  • Jellyfish range from the size of a thimble to approximately 3 metres in diameter with tentacles that reach 60 metres – that’s as long as two blue whales!
  • A group of jellyfish is called a bloom, a swarm, or a smack. A large bloom can contain 100,000 jellyfish.
  • Jellyfish blooms near Japan can have over 500 million jellyfish, with each jellyfish the size of a refrigerator.
  • There are types of jellyfish that are immortal and can rewind back to when they were babies (the polyp stage) when times are bad, and simply start again!
  • The box jellyfish has 24 eyes which give it a 360-degree view of its environment, much like my ex-wife when I was trying to sneakily watch porn. It is also the world's most dangerous jellyfish, and the most venomous marine creature. Certain species of box jellyfish can kill a person in just a couple of minutes.

  • The smallest jellyfish in the world is the creeping jellyfish. It has bell disks from 0.5 mm to a few mm in diameter, and reproduces asexually by splitting in half.
  • Most jellyfish live a relatively short life that ranges from a few days to less than a year. Some of the smallest ones live only for a few hours.
  • Certain non-poisonous species of jellyfish are considered a delicacy in various parts of the world, with the cannonball jellyfish being the most commonly eaten.
  • The Portuguese man-of-war looks like a jellyfish, but it is not a true jellyfish. In fact, it is not even a single animal! It is a siphonophore, which is an animal made up of a colony of organisms that work together.
  • Most jellyfish are passive carnivores, which eat and poop through the same hole in the middle of the bell!


  • A military robotic jellyfish has been created to go on search-and-rescue and survey missions. The silicon ‘Robojelly’ uses hydrogen and oxygen for fuel as it swims, so its only ‘exhaust’ is heat and water.
  • The uncoiling of the jellyfish’s small stingers is one of the fastest actions in nature, with stingers shooting out even faster than a bullet from a gun.
Read 828 times Last modified on Tuesday, 31 July 2018 10:55