Jellyfish or jellies are actually not a kind of fish. They belong to Phylum Cnidaria, which has 10,000 different species of aquatic animals. Their bodies consist of a non-living jelly-like substance, interceding between two layers of epithelium.

Jellyfishes have umbrella-shaped bell and tentacles. They are found in every part of the ocean, from shallow to the deepest sea. We list the other fun facts about Jellyfishes that you can teach to your kids.

  • Most jellyfishes are transparent (see-through) or translucent (almost see-through). But some jellyfishes are almost invisible to the naked eye, very hard to see.
  • There are kinds of jellyfish that can glow in the dark.
  • A group of Jellyfish is called a ‘bloom’, ‘swarm’ or ‘smack’. Bloom would refer to a large group of jellyfish that gather in a small area.
  • Jellyfishes have the ability to clone themselves. If they happen to be divided into pieces, each piece can regenerate and create new organisms. If they get injured, it may also clone itself and probably produce a lot of offspring.
  • Jellyfish lifespans depend on species. Typically, they range from a few hours to several months. There are also hints that show deep-sea species may live on the order of years.
  • Turritopsis dohrnii, a bizarre species of Jellyfish, earned the nickname "the immortal jellyfish". This is because it has the ability to travel back from medusa to the polyp stage when it is stressed, hence, escaping death that usually awaits medusae post-reproduction if they happen to be not eaten by some other ocean organism.
  • Not all of them use tentacles. Scyphomedusa deepstaria lacks tentacles and doesn’t need them to trap its prey.
  • Jellyfishes have no brain and no heart. They only have a primary set of nerves at the bottom of their tentacles. Those nerves can perceive touch, salinity, temperature, and many others.
  • Deepstaria enigmatica is the kind of Jellyfish found in the Arctic seas looks like trash bags.