Natural Resources Wales (NRW) has introduced a native fish to several water bodies in Carmarthenshire to control invasive Topmouth gudgeon (Pseudorasbora parva) populations.
The carefully planned introductions of European perch (Perca fluviatilis), have taken place at five sites in the county: Sandy Water Park; Morolwg, Ashpits and Lower Lliedi reservoir in Llanelli, and a private pond in Cynheidre.
Their introduction follows extensive research into predator-prey relationships. Perch, a native species, have been identified as a natural predator of Topmouth gudgeon and provide an effective method of population control without the need for chemical intervention.
Topmouth gudgeon is listed under the retained EU Invasive Alien Species Regulation 2014 and is a GB rapid response priority species.
Its presence threatens native wildlife and habitats, and its rapid spread could have serious national ecological consequences.
The evidence-based control programme has been funded by Welsh Government, developed by NRW working closely with Carmarthenshire County Council, Llanelli Rural Council, Swiss Valley Angling Association, and a private landowner.
Posted On: 10/03/2025
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