"I don't think we'll ever completely clear our rivers of red signal crayfish, " she said.
BBC: Study may help endangered white clawed crayfish
"Signal crayfish are having a catastrophic impact on white clawed crayfish", said Abby Stancliffe-Vaughan, who is organising the study.
Traps are being laid in the Brecks, on the Suffolk and Norfolk border, to see if the signal crayfish can be managed.
The native species is under threat from red signal crayfish, which were introduced to the UK in the 1970s and now dominate rivers.
Signal crayfish carry a fungal disease known as crayfish plague that has wiped out the native crayfish from most rivers in the south of England.
BBC: American signal crayfish invade Northumberland river
Ms Stancliffe-Vaughan, a PhD student, said the biodiversity of the rivers was also under threat due to the erosion and siltation caused by the signal crayfish.
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