Jellyfish eat a wide variety of things including small plants, copepods, fish eggs, fish larvae, plankton eggs and even other jellyfish. Jellyfish can often cause problems for fisheries because jellyfish will eat nearly everything in the water until there is little food left to eat for the fish.
Jellyfish have millions of stinging cells in their tentacles, which allow them to capture food by injecting toxins. Jellyfish are drifters. They are not strong swimmers, so they live at the mercy of the ocean’s currents. The majority of all jellyfish live for approximately a year, but some may only live for a few days if the conditions in the water are not ideal.