LO However, the values reported by Preston (1970) for cod and plaice from northern latitudes were higher by from three to four orders of magnitude. os conteined 37 magnitude as Pacific salmon sampled in 1967 (Jenkins, 1969) ws . Cs concentrétions generally in the same order of those of the eas Magnitude greater. cod but in some cases even tee These differences between 137 an order of as Cs concentrations in tune and those in the fish from the middle and northern latitudes reflect the well-known latitudinal differences in worldwide fallout 1 (Joseph et al., . . the contributions of 137 in press) and probably also reflected : Cs from surface runoff in some areas, as Preston has pointed out. In recapitulation: The tuna from the southern hemisphere tended to have lower concentretions and specific activities than tuna from the northern hemisphere. . . trends in the data when with species, 55 tes . location of fish, There was a close correlation of ; muscle, 1 55 contained +46 Co believed to be [He Cesium-137 1 . tok 55 . Fe concentration between Yellowfin tuna caught near Bikini Atoll . 60 correlation of Co and liver. toes or size of fish. specific activity in light dark muscle and liver and of dark muscle and liver. a close es Fe specific activities were compared month of catch, . There were no significant derived from the atoll. There was . concentrations between dark muscle concentrations were lower than those reported for fish from middle and northern latitudes by three to five orders of magnitude. ARCHIVES