Sediment Sampling Sediment samples were also collected at those locations sampled for water and from other locations around the inner perimeter of the lagoons. A hand- held Ponar grab sampler was used, and the undisturbed top layer was subsampled to a depth of 3 cm, placed in plastic bags, frozen, and sent to LLNL. Fish and Invertebrate Sampling Throw nets were used exclusively to catch reef fish at the atolls. Large pelagic and benthic fish were collected on sport fishing gear using feathered jigs or baited hooks while trolling in the lagoons. Edible collected by hand (free diving) in shallow areas of each lagoon. clams were returned to the research vessel, plastic bags, and frozen. clams were The fish and segregated by species, placed in .The samples were shipped frozen to LLNL for storage and eventual processing. Specific species were collected because they are commonly eaten by the Marshallese; relatively abundant at all atolls and at different locations within an atoll; have different feeding habits; and for some, represent species for which previous radiological data were available at Enewetak and Bikini. It was not always possible, however, to obtain a sufficient number of the same species at every location we sampled. Various reef fish were collected. Mullet Crenimugil crenilabis and Neomyxus chaptalii are herbivorous, detrital feeders that ingest considerable quantities of bottom sediment along with food. triostegus are herbivorous filamentous algae that browsers feeding Convict surgeonfish Acanthurus on small algal fronds and grow on reef rock or on the base of dead coral. The unicornfish Naso lituratus, also a herbivore, browses on larger seaweed growing on sandy browsers areas. of and but rocky will areas. Rabbitfish occasionally feed fleshy rostratus items found are in herbivorous garbage Rudderfish Kyphosus cinerascens are strictly herbivorous browsers. the above fish belong to Mulloidichthys samoensis consume small on Siganus clams, belongs strictly to on crustaceans, the third benthonic other trophic fauna the second level.” fossorial and other benthic invertebrates, level.” and trophic also and Threadfin belong to small fauna fish. Polydactylus the third All Goatfish including This species, sexfilis trophic dump feed level.”