The Immortal Jellyfish

Where are immortal jellyfish found?
Immortal jellyfish are thought to have originated in the Mediterranean Sea, however they are now found in oceans all around the world. It is thought this recently noticed invasion may have been predominantly caused by humans.

A prevailing theory is that ships are responsible for widely dispersing the creatures through Earth's oceans. The jellyfish's immortality makes it an excellent hitchhiker, after all.

Ballast water is pumped in and out of vessels like cargo and cruise ships to maintain stability. It is highly possible that immortal jellyfish get drawn in with this water and are able to survive ocean crossings thanks to their ability to reverse their life cycle when they experience stresses, such as a lack of food.