The Lakes Bävervattnen Project is a unique long term study of natural brown trout populations in an undisturbed setting in the Hotagen Nature Reserve in central Sweden. We address a wide range of issues relating to microevolution and conservation genetics including methods for estimating and monitoring effective population size over space and time. We are addressing issues concerning temporal stability (monitoring of genetic diversity) over time as well as spatial divergence. We use Pool-seq and individual sequencing, and have published one paper.