Jellyfish swarm Norwegian coast, forcing beach closures

Jellyfish have invaded the Norwegian coast in such dense numbers this summer that some beaches have been closed to swimmers, Dagbladet reports.

Large swarms, particularly of blue and red jellyfish, have been reported along the Skagerrak coast, with heavy concentrations around Arendal and Kristiansand. In some areas, the water is completely covered, according to Tone Falkenhaug, a marine researcher at the Institute of Marine Research.

The surge began in June and has since spread northward toward the Vestlandet and Nordland coasts. Public reports submitted to the citizen science initiative Dugnad for havet (Community Effort for the Ocean) confirm widespread sightings, providing researchers with data on jellyfish distribution.

Falkenhaug notes that while jellyfish populations fluctuate yearly, this summer has seen an unusually high number of blue jellyfish, a species that has expanded northward as sea temperatures rise. In some areas, blue jellyfish now outnumber the red.

Swimmers are advised to check conditions before entering the water. If stung, Helsenorge.no recommends rinsing with seawater, removing any remaining tentacles, and soaking the affected area in warm water for up to 30 minutes.