This data set provides the data as represented in the corresponding report, presenting the results of fish surveys performed in 2015 in rivers and canals. These surveys were done in the framework of the 'Reference Freshwater Monitoring’. In addition the results provide the biological information (fish) required by the European Water Framework Directive (WFD). The raw data is published on GBIF and can be derived as such, this data set provides the data as provided in the individual and corresponding figure of the report. We also provide an overview of the results 2013-2015 as we completed cycle 1 (spread over 3 years) in the framework of WFD. The 2015 results are displayed per basin and concisely discussed in several chapters. We surveyed 25 locations in 2015. We used electro fishing, fyke nets, trawl netting or a combination (multi-method) of these methods. The 25 sites are located in 25 water bodies, of which 13 are Flemish water bodies and 12 local water bodies. There were only three sites without fish. We discuss the occurrence of the species for the period 2013-2015 survey results. We also compare the EQR values (Ecological Quality Ratio) as these are a measure of the ecological condition of the water body and are therefore important in the context of the Water Framework Directive. The results are briefly discussed in several chapters, and a comparison was made with earlier EQR scores (period of 2010-2012). We surveyed 199 locations in the period 2013-2015. We caught 42 fish species. In 96.5% of the sites fish was present. With a presence in 58% of the sites, eel and the three-spined stickleback, were the most frequently caught species, followed by roach in 48% of the sites, then perch (47%) and gudgeon (42%). 167 locations on rivers and streams were sampled. The sites are located in 63 different local water bodies and 68 different Flemish water bodies. Only 8% of the waterbodies were in a ‘good condition’. Most of the sampled water bodies were in a ’moderate condition‘ (44%). 30% of the water bodies were in ...