A megamouth shark sighting off South Africa is closing a scientific gap that's stood for nearly 50 years. In this episode of Ocean Decoded Live, shark scientist David Ebert breaks the story of a rare new megamouth shark specimen found on South Africa's west coast, and host Andrew Lewin explains why this single discovery matters so much. Megamouth sharks were entirely unknown to science until 1976, when one was accidentally caught off Hawaii. Since then, over 300 records have accumulated worldwide, concentrated in hotspots like Japan, Taiwan, the Philippines, and the eastern Pacific. But one region had never produced a single confirmed sighting, until now.
This new specimen is only the second megamouth ever recorded in South African waters, and the first-ever record from the Southeast Atlantic specifically, the one ocean region that had never turned up this species. Andrew uses this discovery to dig into a bigger question most people never think about: we genuinely don't know where most shark species actually go. Some spend their entire lives along a single stretch of coastline. Others cross entire oceans. This sighting confirms megamouth sharks now have documented records in every major ocean basin on Earth, and it's a reminder that the maps we draw of where animals live are only ever as good as where humans happen to be looking.
The episode also features an Ocean People Profile on Ellen Spooner, a marine biologist and podcaster building a bridge between ocean conservation and AI-driven climate solutions, and a science story on a resilient Florida seagrass that may hold the key to restoring one of America's most polluted, and most biodiverse, estuaries.
Takeaways:
A new megamouth shark specimen found on South Africa's west coast is only the second-ever record of this species in South African waters, and the first-ever record from the Southeast Atlantic.
This discovery confirms megamouth sharks now have documented sightings in every major ocean basin on Earth.
Megamouth sharks were unknown to science until 1976, when the first specimen was accidentally caught off Hawaii; more than 300 records have been documented since.
The sighting is a reminder that scientific range maps for many shark species remain incomplete, shaped by where humans have happened to look rather than where the animals actually live.
Ellen Spooner, a marine biologist and podcast host, is building a career at the intersection of ocean conservation storytelling and AI-driven sustainability solutions.
A resilient Florida seagrass, Ruppia maritima, is showing real potential as a tool for restoring the heavily polluted Indian River Lagoon.
