supports media playback device

Jellyfish scientific research Age 40 years

July 22 2014 Last updated at 09:52 BST

Most jellyfish have been discovered on the coast of the United Kingdom during the summer months and scientists try to find out why.

In the largest study of its kind in 40 years, we have studied the reports of over 5,000 observations in Britain and analyzes the results.

Says John Maguire.