-l2- goatfish caught at Kabelle Island. The radioactivity in muscle tissue was Zenerally about the same in Kabelle and Enibuk reef fish. Gamma radioactivity in the muscle averaged about 26 per cent that of the liver with variation of from 7 to 48 per cent. slightly lower, the muscle to liver ratio with a range of from 5 to 27 per cent. Beta activity was averaging about 19 per cent, The greatest difference in the amounts of both gamma andbeta radioactivity between liver and muscle was found in the goatfish. Gamma Spectra Gamma spectra were made on dried samples of tissue to determine if gamma peaks other than those from expected fission products were present. The gamma spectrum curves obtained from various fish tissues are compared with spikes of radioactive cobalt and radioactive zinc in Figure 3 (top, center panel). The gamma spectra (made in October 1957) on whole samples exhibited certain common characteristics with peaks at several positions as follows: 0.12 MEV considered to be from Co97 0.51 MEV " mom " Zn65 0.84 MEV " hom " Mno4 1.12 MEV " mom " 7n85 1.33 MEV " mom " €o60 ayy MS ys