Uptake and Elimination of Some Radionuclides by Eggs and Fry of Rainbow Trout (I)

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The uptake and elimination of radionuclides, ^<60>Co, ^<131>I, ^<137>Cs, ^<144>Ce and ^<l06>Ru by artificially fertilized eggs of rainbow trout were studied under laboratory conditions. The uptake and accumulation of ^<60>Co and ^<137>Cs were more rapid than those of the other radioduclides. Theoretical curves of uptake based on exponential model were fitted to get the parameters, rate of uptake (u), and turnover rate (β), using the least squares method. The concentration factors calculated as the ratio u/β were 7.4 for ^<60>Co, 0.4 for ^<131>I, 0,4 for ^<137>Cs, 146 for ^<144>Ce, 9.9 for ^<106>RuNO-nitro, 12.5 for ^<106>RuNO-nitrato and 6.3 for ^<106>RuNO-binuclear complexes, respectively. The retention curves of ^<60>Co and ^<131>I consisted of the initial short component and the following long one, whereas one component for ^<144>Ce until hatching. The elimination of ^<106>Ru was much slower than that of the other radionuclides and more than 99% of ^<137>Cs was eliminated in about 10 days. The significant fraction of ^<60>Co, ^<131>I, ^<137>Cs and ^<144>Ce in the egg was associated with the perivitelline fluid, while the most part of ^<106>Ru in the egg was accumulated in the egg capsule. The accumulation of the radionuclides in the embryo was rather small.