Now Playing

Chris Farlowe

Out Of Time

Why are we seeing so many jellyfish?

Picture credit: Manx Radio

Abundance of moon jellyfish spotted in Manx waters

Amongst t-shirt tans and paddleboards, there's one sight on the Island's coastline that has caught the attention of many people during the current heatwave - an abundance of jellyfish.

Whether washed up on the shore or out at sea, they do seem to have arrived in greater numbers than is typical for this time of year.

It's one species in particular, the moon jellyfish, and for anyone wondering; no, they don't sting.

A video posted on social media by Casey J Fishing Trips and Coastal Tours, based in the west of the Island, shows a swarm out at sea (or "bloom", to give it it's proper name) containing thousands of the creatures.

But why are there so many of them?

Dr Lara Howe, Marine Conservation Officer for the Manx Wildlife Trust, says there could be a number of reasons, from warming waters extending the jellyfish's breeding season and accelerating their growth rates, to a prevailing wind direction.

And what does it say about the health of the Irish Sea? Dr Howe says: "It can mean a few things.

"It could potentially be a concern, or it could potentially just be a natural fluctuation in what's going on.

"So, it could suggest issues with a lack of other predators of zooplankton not being available like fish species, for example, and therefore there's more food availability for the jellyfish to eat."

She adds: "If this happens a lot more and with greater intensity, that's when you would start to worry.

"And it would also suggest that maybe the predators of jellyfish might be in decline as well, possibly allowing them to flourish and not be eaten."

So, while there could be lots of different factors at play causing the moon jellyfish to arrive on our shores in such great numbers, Dr Lara Howe says it's 'not an easy answer, and it's not necessarily a bad sign either'.

Listen to the full interview with Marine Conservation Officer Lara Howe via the Manx Radio Newscast below:

 

More from Isle of Man News