Elusive “Sailback” Shark Rediscovered After 50 Years Off South African Coast

In an extraordinary marine biology discovery, the elusive sailback roughshark (Oxynotus paradoxus), a species not seen for over half a century, has been rediscovered off the coast of South Africa. The deep-water shark, distinguished by its distinctive, sail-like first dorsal fin, was accidentally caught by a commercial fishing trawler operating at great depths. Researchers confirmed the identity of the well-preserved specimen, providing a rare opportunity to study a shark that has effectively been “lost to science.”

The rediscovery is critically important for conservation, as nothing is known about its population size, biology, or specific habitat needs. The specimen will allow scientists to conduct genetic studies and learn about its diet and age, filling a massive gap in our understanding of deep-sea ecosystems. Its find also highlights how little we know about the deep ocean and the potential for many more mysterious species to be discovered—or lost—before we ever find them.

This find serves as a reminder of the ocean’s enduring mysteries and the importance of sustainable fishing practices that minimize bycatch of rare and vulnerable species. It ignites hope that other “lost” creatures may still be out there, waiting to be found.