Barnett spends lots of time around the water and said it looks like more than jellyfish than usual. It's not a problem for boaters but he said he certainly doesn't want to go swimming any time soon.

But for one jellyfish species, it’s reality. This incredible creature possesses a mind-boggling ability to reverse its aging process and return to an earlier life stage, essentially becoming ...

Dr Dan Barrios-O'Neill said the influx of jellyfish was "normal in the grand sweep of time" but there were questions to be asked about whether there were "more blooms, more often".