What’s the deal with eels? – Lucy Porter, David Righton and Caroline Durif
November 26, 2025
AI Summary
5 min readWhat’s the deal with eels?
The European eel has one of the most baffling life cycles in biology. It spawns in the Sargasso Sea, somewhere in the western Atlantic, but no scientist has ever seen it happen. No eel egg has ever been found in the wild. Aristotle, who dissected eels and found no reproductive organs, concluded they arose by spontaneous generation from mud. That was wrong, but it took two thousand years to prove it—and the full picture remains incomplete.
What an eel actually is
The term "eel" covers hundreds of species, but the ones scientists David Righton and Caroline Durif study are the anguillid eels—also called freshwater eels—of which there are about twenty species. The European eel emerged roughly three to five million years ago. Despite the name, electric eels are not true eels at all; they belong to a completely different family.
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What you'll learn
- 1 (00:00) **Opening Banter & Guest Introductions** - Robin Ince and Brian Cox fumble through a D&D-themed intro before introducing the panel.
- 2 (07:10) **Defining the Eel: Not an Electric Eel** - Caroline clarifies that electric eels are a completely different species from the anguillid (freshwater) eels discussed today.
- 3 (07:43) **What Is an Eel? Taxonomy and Key Traits** - David explains the definition and physical characteristics of true eels.
- 4 (14:01) **The Complex Life Cycle: From Larva to Adult** - The panel describes the dramatic transformations eels undergo, from transparent leaf-like larvae to glass eels to yellow eels.
- 5 (20:38) **The Epic Migration and the Mystery of Reproduction** - Eels migrate 8,000 km to the Sargasso Sea to spawn once and die, never returning to freshwater.
- 6 (23:28) **How Do They Navigate? The Magnetic Field Hypothesis** - Caroline explains the likely navigational cues for the transatlantic migration.
- 7 (26:28) **The Unobserved Spawning Grounds** - The panel discusses the enduring mystery of the exact spawning location and the failure to find eggs or spawning adults.
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Show Notes
Fishing rods at the ready, Brian Cox and Robin Ince attempt to reel in a creature that has baffled scientists since Aristotle: the eel. Wriggling in to help them uncover the mysteries of one of nature’s slimiest subjects are marine scientists David Righton and Caroline Durif, and comedian Lucy Porter.
How do eels navigate such vast distances so deep under water? Why has no one ever seen them reproduce? And WHY would anyone eat them jellied with pie and mash?! The panel discovers that Spanish eels are always late and that eels from all different countries are thought to meet up somewhere in the Atlantic Ocean for a huge annual orgy.
Producer: Melanie Brown Assistant Producer: Olivia Jani Executive Producer: Alexandra Feachem A BBC Studios Production
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