Seasonal changes in uptake and depuration of 137Cs and 90Sr in silver Prussian carp (Carassius gibelio) and common rudd (Scardinius erythrophthalmus)

Dynamic transfer of radionuclides to fish was studied in a series experiments under field condition two lakes within the Chernobyl exclusion zone during 2016–2020. “Clean” common rudd (Scardinius erythrophthalmus) and silver Prussian carp (Carassius gibelio) were transported contaminated Glubokoye Lake kept cages several months exposure, while “clean” Starukha Lake. Radiocaesium (137Cs) radiostrontium (90Sr) determined intestine contents, muscle bone tissues based on repeated samples exposure. During summer, activity concentrations 137Cs 90Sr increased with time exposure clean caged lake. autumn winter, however, minor changes uptake occurred weeks water. Furthermore, depuration significant insignificant winter when exposed «clean» The rate constant between 8.0 22 day?1 0.2 1.0 autumn-winter. Similarly, 1.4 1.6 day?1, 0.08–0.52 Biological half-lives tissue summer 77 ± 10 days, exceeded 230 days seasons at low water temperature. results demonstrated that highly dependent upon seasons, particular data obtained temperature deviated significantly from literature handbooks. Thus, seasonal radionuclide should be taken into account radiological impact is assessed.