Dietary uptake, retention and tissue distribution of 54Mn, 60Co and 137Cs in the rainbow trout (Oncorhynchus mykiss Walbaum)

The theoretical values of the steady-state trophic transfer factor, expressed on a wet weight basis in trout, are 0.0766 for Mn-54, 0.0777 for Co-60 and 1.45 for Cs-137. The two corresponding half-lives of the depuration kinetics for these elements are 8 and 1120 days, 4 and 170 days and 11 and 940 days, respectively. At the end of the uptake phase, the highest concentrations of Mn-54 were found in the liver, Co-60 in the kidneys and Cs-137 in the digestive tract. After 73 days of depuration, the highest concentrations of Mn-54 were detected in the fins, Co-60 in the kidneys and Cs-137 in the muscles. In general, Mn-54 was concentrated in the bony and cartilaginous tissues, Co-60 in skin, head, bone and muscle and Cs-137 in muscle. (C) 2000 Elsevier Science Ltd. All rights reserved.