[en] In summary, it may be stated that the objectives of this project have been: To collect and process all available Swedish data from 1986-1988 as regards Cs-137 in freshwater fish, water and sediments and lake 'sensitivity' parameters (e.g. pH, other water-chemistry parameters and data on lake morphometry) and to only accept data that corresponded to given quality requirements; To attempt to provide a picture as detailed as possible of how the cesium concentration varied geographically in Sweden during 1986, 1987 and 1988 in different fish species; To try to obtain a picture of how different lake properties influence the proportion of the lake Cs-load that is taken up in biological material; this is interesting and important when creating corrective strategies to speed-up recovery. This implies that we will try to develop load diagrams (effect-dose-sensitivity- diagrams); To attempt to provide a picture of how the cesium concentration varies between different species, seasonally and with fish size. This report takes up only mean values for Swedish lakes smaller than 10 km². Interest has mainly concerned perch, pike, whitefish, char and trout. Data on the following water chemical parameters are given in the register: pH, alkalinity, conductivity, colour, total-P, Fe, hardness (CaMg), K, KMnO₄ and Secci-disc transparency. (8 tabs., 11 figs., 9 refs.)