The region of Prespa lakes is an internationally recognized hot spot of biodiversity with a full size GEF project being implemented transboundary to the three countries sharing the area. Ideally such FSP create an enabling environment into which local smaller initiatives rise and develop complementing the activities of the big project. This project will complement the water-quality monitoring programme with biological indicators. Biological monitoring relatively recently has been adopted as suitable for the quality monitoring of water bodies since organisms act as integrators over time of the environmental parameters that otherwise could be missed by the standard water quality monitoring practice.