White-clawed crayfish surveys

ECOFACT staff commenced aquatic surveys this week, and one of surveys we undertook was a survey for the presence of white-clawed crayfish on the River Liffey. We found that they were present at this site and the photos below show some of the work and observations; including a shot of one of the crayfish we found using a dead Anodonta mussel shell as a refuge. There are also photos of a brook lamprey and dead Anodonta sp. mussel shells which we found at the site.

The white-clawed crayfish Austropotamobius pallipes is listed on Annex II of the EU Habitats Directive. This species is still widespread in lakes and rivers over much of Ireland, but it is becoming increasingly restricted to headwater streams elsewhere in Europe.

The current work was completed on behalf of Irish Rail as there needs to be some bridge scour prevention works completed at this site. We also surveyed for lampreys, salmonids and otters at this site.  We also completed a habitat survey and bird survey. These ecological studies will inform the impact assessment and design of mitigation measures for the proposed works.

ECOFACT is Ireland’s largest independent ecological consultancy and freshwater ecological surveys are a core part of our work. We are national experts in in the ecology and management of the Annex II white-clawed crayfish. If you need a crayfish survey, or any other type of aquatic ecology survey, completed please do not hesitate to contact us.

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