He said: “Oil is a poison, especially when mixed with water. Birds, fish, people, pets and livestock are all at risk.
“The situation has been mismanaged. There’s been no containment [of the spill] whatsoever.”
Nick Urquhart, who runs a local litter-picking group and is also a member of Nene Anglers, said the situation was becoming critical.
“It’s a disaster not only for anglers, but for all the people who use and enjoy the Nene Valley,” he said.