Jellyfish around Anglesey

Wed 14th July 2021

This is the time of year that the beautiful jellyfish arrive at our shores. We’re always a little conscious they have a slightly bad reputation, for obvious reasons!

On our Rib Ride boat trips, we have noticed that Puffin Island is a top spot for the jelly fish to hang out. There are a few different species of jellyfish in this area and we’re going to go into a little more detail below. When you’re next out on a beach, taking a Rib Ride or wading through the shallow waters with your fishing net you’ll know the different types of jellyfish to impress your fellow beachcombers.

Compass Jellyfish

This lovely looking creature has lines leading up to the top of the jellyfish which resemble a compass, it’s nice and easy to spot.

It feeds on small fish, crabs and even other jellies. You will often see very small fish around the tentacles as it offers protection from the bigger predators. Scientists are unsure of why this happens.

Sting rating: 6/10

Moon Jellyfish

The most common jellyfish in the UK waters and you’ll be happy to hear it doesn’t sting. This jelly is 95% water and the purple circles (gonads) are reproductive organs located at the bottom of the stomach.

Mostly eat on plankton that they catch with a layer of mucus over their bell and tiny tentacles bring the food into their mouths.

Sting rating: 0/10

Barrel Jellyfish

These guys are big and you’ll often find them washed up on our shores as they get stuck in the shallow water. They can weigh up to 35kg and be 90cm in diameter.

They have 8 arms that contain the stinging part. If you do find one dead on the beach be wary as they can still sting.

Any large jellyfish you see washed up on the beach are probably barrel jellyfish. Sometimes they are a strange shape as they have been nibbled by fish.

Sting rating: 5/10

Sea Gooseberries

From big to small, these little babies are around 1cm in diameter but their tentacles can be up to 20 times the length of their body.

These little guys do not sting but instead their tentacles have a special adhesive mucus that they use to eat their prey.

Sting rating: 0/10

Lion's Mane Jellyfish

The largest of the jellyfish, and the final in our blog, are the Lion’s Mane. These guys can be as large as 50cm across its bell with tentacles up to 3m in length.

They have one of the worst stings going and you should consult your doctor if the pain stays. If you get stung make sure you remove the tentacles with a stick and rinse with warm water to reduce the swelling.

Sting rating: 8/10

Lots of types of jellyfish can be spotted from the shore or come with us on a RibRide and we can help you spot these wonderful creatures.

Our ‘Puffin and Seals’ adventure tour is a 90 min trip with lots of wildlife spotting opportunities. We look forward to going jellyfish spotting with you soon.