was about twice that of skin and bone at pre-shot stations, increasing to about 9 times in the post shot fish. The increase in activity in post shot carnivores over pre-shot was less than that of omnivores. Of the pre-shot fish samples, omnivores from Engebi had the highest count in liver tissue. After the shot, Bogallua omnivores had the most radioactive liver tissue. The gut averaged about twice as high as the liver at all pre-shot stations, increasing to 4 times in post shot fish; the greatest increase was found in omnivores at Fngebi. Post shot carnivores at Bogallua had 3 times as much activity in the gut as carnivores at Engebi. Comparatively high counts were found in the gut of pre-shot fish at Runit and Engebi and to some extent at Bogombogo and Aomon. Fish with the lowest activity in the gut were collected at Japtan. Distribution of radioactive materials throughout the tissues from gut to muscle was fairly uniform in pre-shot and post shot fish from Japtan and Igurin. For example, by comparing the radioactivity in the gut with that of muscle of all fish, the pre-shot activity in the gut was about 2.5 times and 1.8 | times that of muscle at Jeaptan and Igurin respectively (Fig. 6). ° At other islands the ratios between gut and muscle were markedly greater: about 10.3 times at Rigili, 35 times at Bogombogo, 100 times at Engebi, 68 times at Aomon and 352 times at Runit. Post Japvtan about 1.5 times, shot ratios were as follows: Igurin oO, Rigili over 3,000, Bogallua 107, Engebi 310, Aaraanbiru 1,000 and Runit 940. Ratios between tissues thus seem proportionately - 56 - oe nik, ARCHIVES