River Don, Fish Pass Installations
In order to improve passage of migratory salmon and trout through the River Don catchment, Colmer Ecology was commissioned by a private client to carry out the terrestrial preliminary ecological appraisals of five fish passes through Sheffield.
As a result of past river impoundment, the client proposed either Larinier or easement (baulk and beam) fish passes. As several weirs were listed structures, easements were used as they are less invasive with smaller working footprints.
Prior to planning and listed building consent, Colmer Ecology carried out a suit of surveys including preliminary ecological appraisals, bat tree roost assessments, otter, water vole and aquatic invertebrate surveys where necessary. Furthermore, botanical invasive species surveys were also carried out for Japanese knotweed and Himalayan balsam.
Colmer Ecology provided additional ecological planning advice to the client, with construction commencing in summer 2016 and completed in December 2016. It is hopeful that the project will allow fish to migrate through the Sheffield Don and River Don catchment.