Volunteers from the ZSL eel monitoring in the Thames measure the size of an eel found at Middle Mill. This one was 105mm long. Photo courtesy of Ciara Fleming

Volunteers from the ZSL eel monitoring in the Thames measure the size of an eel found at Middle Mill. This one was 105mm long. Photo courtesy of Ciara Fleming

Volunteers from the ZSL eel monitoring in the Thames measure the size of an eel found at Middle Mill. This one was 105mm long. Photo courtesy of Ciara Fleming

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