A lethal 75ft long drag net designed to catch fish by their gills was found by a member of the Tydd Gote Angling Club stretched across the North Level Drain.
Secretary of the Club David Parlett said: “It’s the biggest illegal net I’ve seen, it would have killed hundreds of fish of all types. It’s the second I’ve found.
“We notified the Environment Agency straight away and they’re investigating. Anyone who finds a net should ring the 24-hour hotline on 0800 807060”