Atlantic blue crab waved out from the Rákos stream in Zugló

A reader spotted an Atlantic blue crab in the Rákos stream in Zugló, Budapest. The crab was identified as Callinectes sapidus, which can survive in freshwater. The sighting was reported to environmental authorities, but no feedback was received. The Duna-Ipoly National Park was notified, and a specialist confirmed the identification. This species is typically found in the western Atlantic but has been introduced to Asia and Europe. The park encourages reporting such sightings, although immediate action may not always be taken.