The summer season of 2025 has brought an unusual phenomenon to the beaches of Andalusia: two marine species have simultaneously appeared in large numbers near the shore. Coastal waters are now seeing swarms of ‘fried egg’ jellyfish (Cotylorhiza tuberculata), as well as sightings of the poisonous blue dragon (Glaucus atlanticus). This has already led to temporary closures of several beaches, particularly in the area of La Línea de la Concepción.
Experts attribute this to rising water temperatures in the Mediterranean and Atlantic oceans, as well as changing sea currents. These factors contribute to the migration and reproduction of marine organisms, affecting the region’s usual ecosystem.
The ‘fried egg’ jellyfish are easily recognized by their round shape and yellow center, resembling an egg yolk. Despite their large numbers, this species poses little threat to humans: contact with the skin usually causes only mild irritation, which quickly subsides. Nevertheless, experts recommend rinsing the affected area with seawater in case of accidental contact, avoiding rubbing the skin, and applying a cold compress. It is not advised to use freshwater, vinegar, ammonia, or other home remedies, as these can worsen irritation. An iodine solution is suitable for disinfection and may be applied several times over two to three days.
Unlike harmless jellyfish, the appearance of the blue dragon raises serious concerns. This small mollusk, known for its metallic blue color, can accumulate toxins obtained from other poisonous sea creatures, such as the Portuguese man o’ war. Even brief contact with the blue dragon can cause intense pain, swelling, vomiting, and severe allergic reactions, especially in children, people with allergies, or those with respiratory problems. It is therefore strongly advised not to touch or attempt to remove these mollusks yourself.
If contact with a blue dragon occurs, it is essential to immediately rinse the affected area with seawater or saline solution, avoiding fresh water. Do not scratch the skin or try to remove remnants of the mollusk with your hands. If severe pain, difficulty breathing, or other alarming symptoms appear, seek medical attention immediately. If blue dragons are spotted on the beach, it is important to inform lifeguards or local authorities to protect other visitors.
Experts note that the simultaneous presence of both harmless and dangerous marine species is linked to climate change and unstable ocean currents. In such conditions, tourists are advised to closely monitor warnings from rescue services and follow water safety guidelines.
The beaches of Andalusia remain a popular destination for tourists, but this summer requires visitors to be more cautious and well-informed. Experts emphasize that timely notifications and following simple rules can help avoid unpleasant consequences and protect your health while enjoying the seaside.
