Uptake and elimination of 137Cs by climbing perch (Anabus testudineus).

This work describes the uptake and retention/biological elimination of 137Cs by climbing perch (Anabus testudineus) under laboratory conditions. The accumulated 137Cs concentration in the whole body of the fish was measured at certain intervals up to 38 d. A significant accumulation of 137Cs was found, but a steady state accumulation of 137Cs was not achieved by the end of the experiment. The bioaccumulation factors and the distribution of the radionuclide in edible parts of the fish were determined. The effective half-life of 137Cs in the fish species was found to be approximately 147 d (average) for elderly and adult fishes and approximately 300 d for younger fishes. Accumulation of 137Cs in the edible parts of the fish was found to be approximately 77% of whole body accumulation.