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Guardians of the Deep: Unveiling Dublin Bay's Spectacular Jellyfish


Dublin Bay, with its vast biodiversity and coastal beauty, is not just a haven for beachgoers and marine enthusiasts; it is also home to a diverse array of jellyfish species. These enigmatic creatures, with their graceful movements and intriguing adaptations, add a touch of mystery to the bay's aquatic ecosystem. In this blog, we'll take a closer look at the various types of jellyfish found in Dublin Bay, shedding light on their unique characteristics and significance.

a collective of moon jellyfish in Dublin Bay
Guardians of the deep

Lion's Mane Jellyfish: Majestic and Mesmerising

a lions mane jellyfish on the beach seen from above
Lions Mane seen from above

One of the most striking jellyfish species found in Dublin Bay is the Lion's Mane Jellyfish. With its flowing tentacles and reddish-brown colouration, this jellyfish commands attention. Its tentacles can extend up to several meters, making it a formidable predator. While its sting can be painful to humans, it rarely poses a serious threat. The Lion's Mane Jellyfish is often spotted during the warmer months, a testament to the bay's thriving marine environment.

Moon Jellyfish: Delicate Elegance in Translucent Form

a collective if moon jellyfish commonly found in Dublin Bay
Moon Jellyfish collective

Contrasting the Lion's Mane is the Moon Jellyfish, a creature that epitomises grace in its simplicity. With its translucent bell and four distinct horseshoe-shaped gonads, the Moon Jellyfish glides through the water like an otherworldly dancer. These jellies are harmless to humans, with mild stings at worst. Their prevalence in Dublin Bay is a reminder of the bay's capacity to support a wide range of marine life, from the impressive to the delicate.

Compass Jellyfish: Navigators of Dublin Bay

A compass jellyfish lit under dim light in dublin bay
Compass Navigator Jellyfish

Named for their distinctive brown markings that resemble a compass rose, the Compass Jellyfish is a frequent visitor to Dublin Bay. Their vivid colours and intricate patterns make them a captivating sight for snorkelers and divers. While their sting is generally mild, it's advisable to maintain a respectful distance.


Dublin Bay's jellyfish inhabitants, from the majestic Lion's Mane to the delicate Moon Jellyfish, paint a vivid portrait of the bay's diverse marine ecosystem. They remind us of the delicate interplay of nature's elements. While some jellyfish stings may prompt momentary discomfort, their presence serves as a valuable reminder of the intricate web of life that thrives beneath the bay's surface.


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