Signal Crayfish

Pacifastacus leniusculus

Description:
Signal Crayfish
Facts:

Introduced to the UK as a food species in the 1970's these crustaceans escaped from their landlocked ponds into Britains rivers and rapidly spread. They are carriers of "crayfish plague" which has attacked the UKs native crayfish and depleted their numbers greatly. In addition they threaten fish stocks through predating on their eggs and damage banks by their habit of burrowing into them.

Introduced:

1970's
Origin:
North America
Location:
Throughout UK, strongest in South and East
Status:
Increasing
Problems:
Comments:
Threat to native crayfish, damage to river banks, predates on fish eggs and insect larvae.