The word "jellyfish" usually conjures up an image of a gentle creature floating in the water column - disc-shaped, like aurelia, or mushroom-shaped with long tentacled threads, like cyanea.
But there are jellyfish that can, but "don't like" to swim. They turn upside down and float to the bottom, cling to it with a dome and continue to actively "float", pumping water on themselves.
For example, the colorful Mediterranean jellyfish
Cassiopea andromeda does this. In English, these jellyfish are called: "upside-down jellyfish" ("inverted jellyfish").
They live on mudflats, shallow lagoons and in mangroves, and their legs are often mistaken for the legs of anemones. Cassiopea andromeda is carnivorous and eats small marine animals, which it kills with stinging cells.
The jellyfish throws these cells up in a cloud, so it's better not to swim near it - you can get burned!
