Signal crayfish

Did you know?

Every hour enough plastic to fill two bin bags is washed into our oceans from canals and rivers.

Found throughout England, these 15cm long beasts are aggressive, breed faster than the native species, and damage banks with their burrowing.

American Signal Crayfish coming out of water onto grass American Signal Crayfish, copyright GBNNS

In high densities, they burrow into banks causing extensive damage while eating most of the plants and small animals within the watercourse.

Their population has been thriving since they were brought to England as fashionable seafood, which is unfortunate for our more docile white-clawed crayfish native to Britain.

Our native crayfish have been depleting in numbers over the last 30 years as a result and are now a protected species.

The American signal also carry a fungal disease called ‘crayfish plague’, which is harmful to our native species, and can be spread by wet footwear and equipment.


Last date edited: 15 March 2018