SOME OBSERVATIONS ON SEASONAL-VARIATION OF RADIOCESIUM CONTAMINATION IN TROUT (SALMO-TRUTTA L) AND ARCTIC CHAR (SALVELINUS-ALPINUS (L) IN A NORWEGIAN LAKE AFTER THE CHERNOBYL FALLOUT

This study of radioactive contamination in freshwater fish shows a clear dependence to seasonal feeding habits. The mechanism of radioactivity storage in the fish body seems to be selected to concern mainly radio-Cesium (strontium content not explored). The biological half-life of this element is estimated to be in the order of one to one and a half month. The fall-out particles must have a faster rate of sedimentation than earlier expected. © 1990 Kluwer Academic Publishers.