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White-Clawed Crayfish

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White-clawed crayfish survey


  • Habitat assessment involving evaluating the potential value of river habitats for crayfish
  • Presence/likely absence surveys using manual searches, sweep netting and torchlight surveys
  • Trapping using funnel traps under license from the relevant SNCO (Statutory Nature Conservation Organisation)
  • Monitoring surveys


Impact assessment


  • Identification of potential direct and indirect impacts, both at the site level and in a wider perspective: risks of disturbing, injuring or killing white-clawed crayfish, habitat modification, loss, fragmentation or isolation, post development interference impacts and poor data situations or ‘last minute discoveries’.
  • Quantification of potential impacts in terms of extent, magnitude, duration, timing, frequency, reversibility and cumulative effects.
  • Strategic advice on project feasibility.




Preparation of licence applications to permit otherwise unlawful acts in relation to white-clawed crayfish.




  • Precautionary working method statements
  • Tool box talks
  • Ecological clerk of works role
  • Receptor site selection
  • Habitat design plans including channel improvements and aquatic and emergent vegetation planting
  • Relocation of white-clawed crayfish to a suitable habitat prepared in advance
  • Mitigation management plans