How Do Eels Reproduce? The 2,000-Year-Old Mystery Explained

For almost as long as people have fished for eels, they’ve wondered where baby eels come from. The answer involves a journey of thousands of miles across the Atlantic to a single patch of sea. This article traces the mystery from ancient Greece to modern labs, and explains what scientists have — and haven’t — figured out about eel reproduction.

Mystery lasted: Over 2,000 years ·
Spawning ground: Sargasso Sea (discovered 1922) ·
Captive breeding success: 75% of females lay eggs (WUR, 2025) ·
Species of freshwater eels: 19

Quick snapshot

1Confirmed facts

• Eels spawn in the Sargasso Sea (PMC (peer-reviewed biology journal))
• Larvae are leptocephali (PMC)
• Eels are catadromous (Alliance for the Bay (Chesapeake Bay conservation group))
• Eels die after spawning (U.S. Fish and Wildlife Service (federal species report))

2What’s unclear

• Exact cues that trigger spawning migration
• Complete
  

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Freddie Oliver Cooper Howard

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