This chapter of Ecological Surveying Techniques for Protected Flora and Fauna during the Planning of National Road Schemes provides useful guidance on general characteristics, potential impacts of road projects, survey techniques and mitigation.
This is part of our Good Practice Guidance for Fish, produced by Vaughan Lewis, Steve Coates and Kerry Sims.
Reference: Fish and Atlantic salmon sections in: NRA (2009) Ecological Surveying Techniques for Protected Flora and Fauna during the Planning of National Road Schemes. National Roads Authority.