Objective Method Urchins individual samples are anticipated and all will be surveyed for relative activity levels. A selected number, probably no more than 200 will be quantitatively analyzed. Included in the latter estimate are all species used. in the diet. Some selected shells Sea cucumber Clams Coral Starfish and coral will be carefully analyzed Langusta and correlated with growth rates, concentrations, as indicators of changes in the environment as a function of time, 3) Gut contents of bottom-feeding fish collected in different areas will be analyzed to assess concentration levels in lagoon areas, Comparison of the activity levels in each of the above sample types will be used to contour activity levels in the lagoon and reef, Data from many sample types, especially edible organisms, will be used for dose assessment, Field recommendations will be forwarded to the laboratory for guidance in sample preparation and analysis. Food chain dose assessment requirements Purpose: To provide samples in order to determine the activity levels in all edible marine species, The data are required to assess dose from aquatic food sources. There will be close coordination with the radiological assessment team who will generate the information regarding Marshallese diet and define the percentage of each marine trophic level in the diet. This information is necessary to determine the sample size of a species needed, method of the sample. type of species, and post-treatment Assessment of the levels of activity in carnivores, bottom feeding carnivores, omnivores, herbivores and all invertebrates will be made. Dietary habits of the Marshallese people will be considered in the treatment of samples. Some species may be consumed whole, these defined specimens will be made on the entire fish. The analysis on For those species where only the flesh or other organs are consumed, the samples will be dissected and the tissue analyzed. The variability in activity levels in similar species from different areas will be determined. areas visited by the 1964 survey team, Sampling sites will include those Fishing methods will include trawls, gill nets, long lines, traps, rod and reel, and spearing. Although the fishing will be operationally defined, 200 to 300 samples are anticipated for quantitative ~25-