A rare Risso’s dolphin has been sighted in the open waters of the Aegean Sea, Greece, drawing attention from marine researchers working in the region.
Sighting recorded between Ikaria and Chios
The sighting took place between the Greek islands of Ikaria (Greek: Ικαρία) and Chios (Greek: Χίος) during a field mission by researchers from the Archipelagos Institute of Marine Conservation.
Scientists were working aboard the research vessel Nautilus when they observed the dolphin moving through calm waters. The institute later shared details of the encounter on social media. The sighting occurred on a quiet spring day, shortly before the return of the strong seasonal winds known as the meltemi, which often make marine research more difficult.
Species remains difficult to study
Risso’s dolphins are rarely seen and remain poorly understood. Their wide-ranging movement across the open sea limits opportunities for close study. Researchers say the species does not stay in one location for long, making it difficult to track behavior, population size, and migration patterns over time.
Known in Greek as stachtodelfino, or “ash-gray dolphin,” the species is recognized for its pale body marked with scars. These markings develop over time and give the dolphin a distinctive appearance. Marine experts say it is the largest dolphin species found in Greek waters and the only one in the region known to migrate.
Risso’s dolphins usually travel in small groups. Pods often include between three and 20 individuals. These groups can cover large distances in a short period, further complicating long-term research efforts.
Deep-diving ability sets species apart
The species is also known for its exceptional diving ability. Researchers say Risso’s dolphins can dive to depths of up to 300 meters, or nearly 1,000 feet. They can remain underwater for more than 30 minutes before surfacing. This ability allows them to hunt prey such as squid and deep-sea fish, which live far below the surface.
Scientists say these traits point to a specialized role in deep offshore ecosystems. Unlike many other dolphin species in the Mediterranean, Risso’s dolphins are adapted to life in deeper waters rather than coastal areas.
Marine experts say sightings like this are important for research. Each confirmed observation provides valuable data on a species that remains difficult to study. Researchers continue to monitor the Aegean to better understand its marine life and the role of lesser-known species within it.
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