Crayfish & Invertebrates

Crayfish & Invertebrates across Surrey, Dorset, Somerset and Wiltshire

White-clawed Crayfish-Current Status and why they are protected

White-clawed crayfish are protected under the Wildlife & Countryside Act 1981 (as amended) making it a criminal offence to; intentionally or recklessly kill or injure a white-clawed crayfish, or sell or attempt to sell any part of this species. The Habitats Regulations (2010) provide further protection and they are a Priority Species under the UK Biodiversity Action Plan (BAP and as a Species of Principle Importance in England under Section 41 of the NERC Act 2006

Darwin Ecology White-clawed Services:

  •     White-clawed crayfish surveys
  •     Habitat design and creation
  •     European protected Species License application

White-clawed Crayfish Surveys

Surveys of white-clawed crayfish populations involve setting funnel-shaped traps containing bait along the banks of streams, manual searches and torchlight searches. Optimum timings for surveys are between July and October. Use the calendar above to help plan your work schedule.


If the presence of white-clawed crayfish is confirmed on a site, efforts should be made to ensure the crayfish and their habitats are retained and suitably protected during and after the development. Where it is not possible to retain crayfish habitat, it may be necessary to capture and trans locate crayfish to alternative habitats under a European Protected Species licence. Mitigation measures for white clawed crayfish may include the removal of crayfish from the water body prior to development works and habitat creation or enhancement. It is essential to ensure that the crayfish have a suitable habitat both during and after the development. 


Where white-clawed crayfish are reasonably likely to be present, a trapping survey carried out by a qualified ecologist holding the relevant survey licence is required. In England and Wales, a separate license for the us of crayfish traps under the Salmon and Freshwater Fisheries Act. In England, survey licences are issued by Natural England. 

For more information on badger surveys across Farnham, Surrey, Dorset, Somerset and Wiltshire contact us now.

Invertebrates-Current Status and why they are protected

Invertebrate species are protected under the Wildlife & Countryside Act 1981 (as amended) as well as the Conservation of Habitats and Species Regulations 2010. Many species of invertebrates are also Priority Species in the UK Biodiversity Action Plan. Red Data Book and other notable species must also be taken into account during ecological assessments.

Darwin Ecology Invertebrate Services:

  •     Scoping of the site to ascertain site quality for invertebrates
  •     Survey methodologies suitable to your site
  •     Conclusions of site importance for invertebrates and communities present
  •     Reporting to present findings
  •     Mitigation design and application 

Invertebrate Surveys

Invertebrate surveys are best undertaken between March and October, particularly if a number of site visits a required. Depending on the habitats present on site the optimal survey period may vary for example Heathland surveys should be undertaken in late summer and grasslands in June and July when plants are likely to be in flower.


Invertebrate mitigation is often incorporated into our projects as part of our standard mitigation procedures for example planting plants which are favourable to invertebrate species likely to be present on a site. Mitigation is often site specific depending on the results of the surveys and we will create mitigation to suit the species on site and your project. 

For more information on invertebrate surveys across Farnham, Surrey, Dorset, Somerset and Wiltshire contact us now.

Southern Office - Farnham, Surrey

Helen Cavilla
01252 413 221
07701 370 762

Laura Ashford
01252 413 221
07525 134 803

South West Office - Shaftesbury

Michael Cummings
01252 413 221
07748 843 842
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