Environment AgencyEndangered crayfish rescued from a drying watercourse have been released back into the wild.
More than 30 white-clawed crayfish, including 21 egg-carrying females, were removed from a beck in Burley, Whafedale, West Yorkshire, in July because they were struggling due to the drought.
The adults, along with 30 juveniles that hatched during quarantine, have now been released into a tributary of the River Wharfe.
Tim Selway, a biodiversity specialist and crayfish expert at the Environment Agency, said: “We’re hoping this population will breed and support the long-term future of the species.”
According to the agency, the species is the UK’s only native freshwater crayfish. The crustaceans play an important role in keeping waterways clean and as a source of food for other native species.
White-clawed crayfish used to be common across Yorkshire, but have lost out to the larger, more aggressive American signal crayfish.
The Wharfe catchment has long-established and extensive populations of the invasive signal crayfish, which puts the native species at risk.
Environment AgencyThe previously unknown population of white-clawed crayfish in Burley was reported by local resident Scott Davies, who noticed the crustaceans in distress.
He alerted the Environment Agency, whose fisheries team carried out an emergency rescue of 32 adults and quarantined them at York Gate Gardens, near Leeds.
About 30 more juveniles are being kept in quarantine until they grow large enough to be released – potentially into the same tributary of the Wharfe once water levels improve.
Environment AgencyMr Selway said: “This location has been chosen as it is already a known safe site for native crayfish in the Wharfe, as a barrier in the river prevents the invasive American signal crayfish from reaching them.
“Finding this unknown population was great news, and this will help to support native crayfish conservation work in Yorkshire.”
