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Carl Sayer

Carl Sayer

Professor of Limnology & Freshwater Ecology at University College London; leading expert in pond and eel restoration.

Jul 7, 2026

3:51
Which is where?
3:52
Deep in the Atlantic, not far from Bermuda.
3:54
Some, some massively deep, mysterious underwater place where they spawn, but we don't really understand it, and then ocean currents carry them, carrying them back.
4:04
The Gulf Stream brings them back to, to Europe and North Africa, and then they, they ride the currents.
4:09
They ride the bores sometimes up some of the rivers, and they head into fresh waters, and you're talking two or three years.
4:14
They arrive as glass eels and move up into fresh waters and become yellow eels.
4:19
And then of course, they come back as silver eels, but what a incredibly complex thing, and it takes several years.

6 MINS LATER

10:52
... of that huge loss?

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