In recent days, the coasts of the Basque Country and Asturias have been impacted by the presence of Portuguese man o’ war, also known as ‘false jellyfish’. These venomous creatures have necessitated the closure of several beaches after causing a severe sting to a 6-year-old girl in San Sebastian.
The appearance of these Portuguese man o’ war is not an isolated incident. This year, warmer temperatures and specific sea current patterns have facilitated their arrival in regions where they are typically uncommon. Beaches such as La Isla, La Griega, and Lastres in Asturias, and Ondarreta and Zurriola in San Sebastian, have raised red and white flags to warn bathers and prevent stings from these dangerous creatures.
In the Canary Islands, the presence of these marine organisms is more frequent, as the warm waters provide an ideal habitat. Tenerife, in particular, has experienced several encounters with Portuguese man o’ war in recent years. For instance, in February 2022, the 112 Canarias emergency services reported sightings of these venomous organisms on Benijo beach, prompting the raising of red flags and precautionary measures for swimmers. A similar situation occurred in Almáciga, where numerous Portuguese man o’ war sightings led to temporary beach closures to prevent incidents.
Güímar also recorded an invasion of Portuguese man o’ war, especially on El Puertito beach, where hundreds of these organisms were spotted last year. As sea temperatures continue to rise, the frequency of these sightings is likely to increase, necessitating ongoing vigilance and precautionary measures on the beaches of Tenerife and across the country.
The Portuguese man o’ war (Physalia physalis), often mistaken for a jellyfish, is actually a colony of organisms working together. Known for its long, venomous tentacles, this species poses significant risks due to its neurotoxic, cytotoxic, and cardiotoxic venom.
The creature, characterised by its blue and purple coloration, has tentacles that can extend up to 50 metres, equipped with stinging cells capable of releasing venom that causes intense pain, burning, nausea, vomiting, fever, and even heart problems in severe cases. Children, the elderly, and individuals with health conditions are particularly vulnerable to its stings.
Authorities have established clear protocols to protect bathers when Portuguese man o’ war are spotted. If fewer than three specimens are seen, a yellow flag and a jellyfish warning sign are raised. Should the number be higher, the beach is closed entirely, and a red flag along with a jellyfish warning signal is displayed.
In the event of a jellyfish sting, it is crucial to act swiftly:
- Exit the water immediately.
- Avoid rubbing the affected area to prevent the release of more venom.
- Rinse the area with seawater or saline solution, never fresh water.
- Carefully remove any attached tentacles using tweezers or a fine-edged object.
- Seek medical attention, especially if the person shows signs of a severe allergic reaction.
As the summer progresses and sea temperatures remain high, the vigilance against these ‘false jellyfish’ will continue to be of utmost importance to ensure the safety of beachgoers.
