THE only species of crab that can be found in UK freshwaters has been found in the Conwy Estuary.

The Chinese mitten crab, an invasive non-native species (INNS) which poses a threat to biodiversity, is also already established in the Dee Estuary.

This Invasive Species Week (May 20-26), Natural Resources Wales (NRW) is asking people across Wales to help stop the spread of the species.

Rare sightings have also been recorded in the Severn estuary, and NRW is encouraging people to record any sightings on the iRecord app or online so they can better understand their impact and spread.