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Biol Bull 133: 438-447. (October 1967)
© 1967 Marine Biological Laboratory
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LOSS OF ZN65 FROM THE CALIFORNIA SEA-MUSSEL MYTILUS CALIFORNIANUS

D. R. YOUNG 1 and T. R FOLSOM 1

1 Scripps Institution of Oceanography, La Jolla, California 92037

To determine the loss rate of Zn65 in the California sea-mussel, colonies of Mytilus californianus averaging 11 cm. in length were translocated from the vicinity of the Columbia River mouth to southern California waters, where much lower levels of Zn65 occur. The colonies were suspended in nets at Scripps Institution of Oceanography Pier, and were sampled periodically for one year. During this time, the concentration of Zn65 in the soft tissues (after deducting radioactive decay) decreased by more than 97%. This decrease appears to be described satisfactorily by a single exponential function, with a biological half-time for growing organisms of 76 ± 3.5 days. If radioactive decay is not excluded, the observed loss rate of Zn65 is described by an "effective half-life" of 58 ± 2.7 days.






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