Abstract
Radioactive 54Mn and (or) 65Zn were found in the seven species of euryhaline fish examined; alewife, char, eel, salmon, shad, smelt, and sturgeon. These two radionuclides were not observed in any of the more than 30 stenohaline species investigated. Retention of 65Zn was demonstrated only in euryhaline fish taken from a marine (saltwater) environment, whereas 54Mn was retained by euryhaline fish living in either fresh or salt water. Their complex osmoregulatory systems, in addition to their feeding habits, are advanced as causal factors for the accumulation of 54Mn and 65Zn by euryhaline fish. Because shad and salmon (and probably both the sturgeon and char) were caught during the spawning migration there may be a hormonal influence as well on the metabolism of 54Mn and 65Zn.
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