They are common to the waters off California, Japan, the East Coast of the United States, and Europe. The animal can be large (up to 15 cm across), translucent, and often considered beautiful for the patterns of organs within its body. It feeds by stinging small medusae, plankton, and mollusks with its tentacles and bringing them into its body for digestion, but is capable of only limited motion; like other jellies, it drifts with the current.
Food Web is Affected: Moon jellyfish continue to invade the seas, because turtles are vanishing from the ocean. The sea turtle has been around to keep the food web and food chain of moon jellies steady. Since sea turtles are constantly being used for other products such as purses, moon jellyfish and other jellies have been reproducing outstanding numbers.