Results Greee Beta Radicactivity Table | shows gross leve:s of beta radioactivity in the flehee during July 1937. the fish i. Of the three islands visited the highest levels were found in ue from Kabelle Island. In all cases, for comparable tise -1@ least radioactivity was found in fish collected near Rongelap Island. Radioactivity in muscle tissue of fish from Enibuk Island, Ailinginae Atoll, was as great or greater than that of Kabelle Isiand. Comparatively minor differences are seen in the levels of radicac- tivity in similar tissues of omnivorous and carnivorous fishes from Rongelap Island, except for stomach contents. The presence of algae in the stomachs of many omnivorous fish would account for the higher levels in these fishes. Two species, the goatfish and the halfbeak, were taken in sufficient quantities for separate analyses The goatfish feeds on small inverte- sentsee geen. brates, principally crustacea, of the sandy bottom areas. Levels of radioactivity in the stomach contents and liver of these fish were much higher than in other fish of the same area, however, radioactivity in muscle tissue was not much higher The halfoeaks from Kabelie Isiand had about the same amount of radioactivity as fish fron. Rongelap. reflecting, perhaps, a different feeding habit than that of other fish of Kabelle Island. The halfbeak normally feeds at the surface on macroglankton ,