Will jellyfish take over the world?

homer30 writes: "Researches warn that a 'monoculture of jellyfish' threatens the oceans as we know them. Jellyfish blooms--aggregations of jellyfish--have become more common and larger in recent decades, imperiling fish species, birds, and marine mammals, as well having large-scale social and economic impact. The pattern is linked to human-related activities, such as overfishing, eutrophication, and climate change. Scientists recommend several steps to halt this 'jellyfish joyride'."