The future of white clawed crayfish in Suffolk could be helped by a new study.

BBC: Study may help endangered white clawed crayfish

The bigger and more aggressive American species could "out-compete" the native white-clawed crayfish on the neighbouring River Wansbeck.

BBC: American signal crayfish invade Northumberland river

"Signal crayfish are having a catastrophic impact on white clawed crayfish", said Abby Stancliffe-Vaughan, who is organising the study.

BBC: Study may help endangered white clawed crayfish