Signal Crayfish were accidentally released into the UK after they escaped from commercial fisheries in the 1970s. Over 50 years later, they have decimated the native crayfish population as carriers of crayfish plague, as well as overwhelming and outcompeting the locaal population. But that’s not all… these crayfish also burrow into the banks of rivers and therefore cause erosion, bank collapse and sediment pollution.
The good news is, crayfish are edible. In fact they’re often considered a culinary delicacy! The meat is similar to langoustine and lobster and is generally considered good to eat. However, under the 1981 Wildlife and Countryside act, we’re not actually allowed to catch/hunt crayfish in the UK at all! Why? The risk of trapping native crayfish is too great, therefore meaning that without a strictly regulated licence, unfortunately you’ll be unable to do so.
How can I recognise Signal Crayfish?
Signal crayfish are much bigger than their local counterparts, measuring on average between 16-18cm. They have a red underside to their claws. The top of the body is a greenish-brown colour, with an orange/red lower surface. If you spot a signal crayfish, report it here.
Where can we find Them?
Signal crayfish can be found in most rivers in the South-East of the UK, however sightings have been recorded in almost every area of the country. Amongst our local rivers, the Arun, Adur and Ouse all are known to contain Signal crayfish, therefore this is a strong local problem.
What Can I do?
The main defence against signal crayfish is biosecurity, ensuring crayfish are unable to pass between waterways and canals. When moving a boat/wellington boots after entering waterways, make sure to disinfect and clean to prevent the spread of crayfish plague spores and of crayfish itself!
The Catching of crayfish is only done withe permission from the UK Government. If you wish to catch crayfish, you will need a licence from DEFRA to do so. Read more about the criteria for applying here.
