Jelly fish

Jelly fish.

Some live in the deep sea, some in pelagic regions of the open ocean, and some occupy frigid arctic waters, but most live in coastal regions. However, all of the various species occupy marine, or saltwater habitats and some range into brackish waters. None of the species live in freshwater.
Some jellyfish are clear, but others are in vibrant colors such as pink, yellow, blue, and purple, and often are luminescent.