elon wotgun Sages ve . * ew water, or radionuclides may be adsorbed on the surface of the animal. Although adsorption is an important means of contami- nation of organisms by fresh fallout, it is probably no longer important at Bikini, where the last significant fallout occurred in 1958. The astronomically large surface area presented by the masses of branching corals and their associated flora and fauna must have removed, from the water, all adsorbable radionuclides not already removed by the plankton soon after fallout. The land organisms contain primarily the long-lived fission products 13765 and 90. and, as expected, these radionuclides are found associated with those tissues or organs which contain potassium and calcium, respectively, since cesium and potassium behave similarly in metabolism, as do strontium and calcium. There are quantitative and qualitative differences in radionuclide content of organisms associated with feeding habit. The goatfish, a bottom-feeding carnivore, and 20755 than the convict surgeonfish, or the mullet, carnivores, 207 Bi a plankton feeder the grouper and ulua, (Table 4) contains more 600, a grazing herbivore, (Tables 2 and 3). Higher order also contain more 6066 and than the convict surgeonfish; however, the differences may be associated with age as well as with feeding of Eneray nenartment uistorian’s Office habit. The smaller, and presumably younger, ARCHIVES reef fish of a species contain less 90s, than the larger fish of the same species