# Moon jellyfish accumulation on Öland > Live situation record from CLSTR: https://clstr.news/situations/moon-jellyfish-accumulation-on-land > Updated: 2026-08-10T18:08:22.000Z. Sources: 7. Developments: 2. Large numbers of dead moon jellyfish have washed up along the eastern coastline of the Swedish island of Öland, where members of the Swedish Royal Family, including Princess Estelle and Prince Oscar, are spending their summer holidays. Marine biologist Anna Wall of the Kalmar district administration noted that the accumulation of jellyfish is an unusual occurrence for this time of year, as these creatures typically die during autumn due to decreasing water temperatures and limited food supplies. Wall clarified that the phenomenon is being driven by strong winds, currents, and high waves blowing the jellyfish ashore, rather than a mass die-off, stating, “There are many, many more in the sea. If all the jellyfish had died, that would obviously be a problem. But that is not the case now.” ## Claims - Strong winds, currents, and high waves caused the jellyfish to wash ashore. (corroborated by 3 sources) - Dead moon jellyfish are accumulating along the east coast of Öland. (corroborated by 3 sources) - Moon jellyfish typically die in autumn when water temperatures drop and food becomes scarce. (corroborated by 3 sources) ## Timeline ### 2026-08-10: Öland beaches see mass die-off of moon jellyfish Dead moon jellyfish have washed up on the shores of Öland, impacting the summer holidays of the Swedish Royal Family, including Princess Estelle and Prince Oscar. 5 sources. https://clstr.news/cluster/land-beaches-see-mass-die-off-of-moon-jellyfish ### 2026-08-07: Swedish Royal Family: Jellyfish on Öland and Princess Sofia's return The Swedish Royal Family faces summer jellyfish surges on Öland while Princess Sofia prepares to resume official duties after maternity leave. 2 sources. https://clstr.news/cluster/swedish-royal-family-jellyfish-on-land-and-princess-sofias-return --- Cite as: Moon jellyfish accumulation on Öland. CLSTR, https://clstr.news/situations/moon-jellyfish-accumulation-on-land