22 July 2014 Last updated at 13:00
Wales has been hailed as a jellyfish "hotspot" by researchers who say they could hit record numbers this summer.
Mild winters and warm summers have led to more sightings in recent years, the Marine Conservation Society claimed.
Harlech was a haven for barrel jellyfish, with the lion's mane jellyfish being seen off north Wales.
The findings come in what is claimed to be the first UK-wide survey of jellyfish in more than 40 years.
Jellyfish had a major economic impact through their effect on tourism and fish stocks, and gave a guide to the state of the planet, the MCS said.
MCS biodiversity programme manager Dr Peter Richardson said Wales was one of the most rewarding parts of the UK for jellyfish study, with more reports and more species.
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