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The North American Signal Crayfish was introduced to the UK in the 1970's for aquaculture. It rapidly spread through England in the late 70's and 80's but was not recorded in Scotland until 1995. It has now been recorded in at least 30 sights in Scotland. It is not current present in the River Annan and you can read more about the work we do to prevent it migrating into the catchment here.

Signal Crayfish (Pacifastacus leniusculus)

Pacifastacus leniusculus

White/turquoise blotch on hinge of claw

Pacifastacus leniusculus

Size: 2-15cm wth Red/brown upper body colouration.

Underside of claw bright red

Image: RPS Group PLC

Image: Trevor Renals

What do I do if I find a crayfish?

  •  Leave any live animals where you find them
  • Report to 01576 470600 or
  •  Be aware that it is illegal to trap crayfish
  • It is illegal to be in possession of a live crayfish

Report an Invasive Species


Tel: 01576 470600



Contact Us


Fisheries Office
Annandale Estates, St Ann's
Tel: 01576 470600

Mobile: 07710331079

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