The waters of Bermuda are starting to look like moon jelly soup.

If you were swimming during the Cup Match weekend, it was hard to miss the hundreds of jellyfish that had also decided to visit the Island for the national holiday.

Jonathan Starling of the Bermuda Aquarium Museum and Zoo said that jellyfish "do get together and swarm once in a while".

Mr. Starling said the Sargasso Sea tide had likely pushed a swarm of the jellyfish into the local area.

He said that the creatures are harmless, have a very weak sting and are considered to be the least dangerous of jellyfish.

While many of the jellyfish are small, some can grow as large as 30 centimetres in diameter.

They are usually shaped like a four-leaf clover, and 99.9 percent of their body is comprised of water.

Sometimes they can have a faint purple tinge in colour to them.

Mr. Starling said they are not harmful, but "it depends on the individual's sensitivity".

He said he is not aware of any serious reactions to a moon jelly sting.

If anyone does feel a sting from the moon jellys, Mr. Starling recommended that they use the remedies they would use for a Portuguese Man-o-War sting.

The sting should be disinfected with vinegar, Paw Paw juice or urine, he said.

The moon jellys swimming around Bermuda will probably die off in one or two weeks, he added, but the tides could push more into our waters because "the waters are constantly changing".