the Marshall Islands. Data from this assessment were published in 1982.9 Our second objective was to evaluate the biological accumulation and behavior of This task continued through 1985. the transuranium isotopes at the atoll. In conjunction with on-going studies at Enewetak Atoll, the collections and analyses of fish samples were conducted with several additional research objectives in mind. Among these objectives were studies to assess differences in the concentrations of specific radionuclides the . in fish from different trophic levels, the magnitude of radionuclide concentration factors for different species of fish, the changes in body burdens of radionuclides in fish with time, the tissue distributions of different radionuclides in different species of fish, the differences in radionuclide concentrations in fish from different regions of the atoll, and the usefulness of the current data for modeling concentrations of radionuclides accumulated by species of fish in similar or different marine environments. . The marine program at Bikini Atoll, supported by the Office of Health and Environmental Research of the Department of Energy, was phased out in 1985. Some of the results generated from this program were discussed in published reports.9-10 However, a great deal of data on radionuclide concentrations in fish have not been included in the documents referred to above. This report is prepared to have, in one document, all available data on the concentrations of radionuclides in samples of fish and invertebrates that we collected from Bikini Atoll between 1977 and 1984. reports6-17 contain nearly all This document and previously published of the historical data on concentrations radionuclides in fish from Bikini Atoll of since the initiation of nuclear testing. | The radionuclides for which data are reported include all those detected by gamma spectrometry. In addition, the concentrations of 90sr, !l3mcg, 238py, 2394240py, 241am, 210po, 210ph, and 210Bi are reported for those Samples where radiochemical analysis was performed. COLLECTION METHODS Throw nets were used exclusively to catch reef fish in shallow water from the islands noted in Table 1. (We used the letter and number island identification system convenience.) Large pelagic fish were collected on sport fishing gear while 5000559 in Fig. 1 rather 5 than the Marshallese name only for