If YOU head down to Blashford Lakes tomorrow (Sunday 22nd May) you should be prepared for a big surprise!
A giant surprise even.
In fact a giant crayfish surprise!
Found throughout the UK, their population has been thriving since they were brought to England as a fashionable shellfish in the 1970’s. These 15cm-long beasts are bad news for our native and endangered (listed as Endangered on the global IUCN Red List of Threatened Species) White-clawed crayfish.
American-signal crayfish are larger, more aggressive, breed faster than the native species, carry a fungal disease called ‘crayfish plague’, which is particular harmful to our native species, as well as depleting fisheries directly through predation of fish eggs and indirectly through their severely damaging and undermine river banks with their burrowing and hence destroying freshwater habitat.
So, it is clear that they’re bad news and, although not widespread at Blashford Lakes, they are very much present in water bodies across the Avon Valley and are known to be present at low densities within the nature reserve itself.
The best defence against the signal crayfish invader is biosecurity – ensuring that individual crayfish are not transported between waterbodies and that the spores from the crayfish plague are killed prior to entering another waterbody using the “CHECK – CLEAN – DRY” method for all equipment, footwear or clothing, which have been in the water, for example wellies/waders, boats, canoes, and nets.
So say “Hi” to James if you see him tomorrow and do ask him for more information about American signal-crayfish and other invasive non-native wildlife while he is here.