Jellyfish thrive in the man-made disruption of the oceans Thousands of them plague our beaches to the horror of holidaymakers who dread their sting, but thanks to man's disruption of the oceans, jellyfish are thriving. At the Paris Aquarium, where jellyfish are raised for display, a biologist explains how everything from changing temperatures to discarded plastics seems to be working in favour of increased jellyfish reproduction. IMAGES AND SOUNDBITES