, acto Harpy and Hariey (26) reported the strontium levels in eleven samples of albacore and tuna collected in the Western Pacific. The samples were canned tuna and contained Sr* at an average level of 0.00226 d/m/g of wet tissue. Hiyama (27) reported Sr® data on fish collected near the Eniwetok Test Site. Of 25 fish taken during the Shunkotsu Maru survey during June 1956, 19 contained no detectable Sr® in the tissues, 5 contained approximately 0.14 d/m of Sr*/g dry weight of bone (about 0.06 d/m/g wet), and one contained approximately 1.4 d/m of Sr®/g of bone (about 0.6 d/m/g wet). Of nearly 100 fish collected during July 1954, the most highly contaminated contained 0.003 d/m of Sr®/g wet weight of muscle. SoutuH (unpublished) did strontium analyses on 9 samples of fish tissues collected in Eniwetok Lagoon between 6 July 1954 and 12 February 1955, and found that Sr®°°—Y* contributed from 0.01% to 0.9% of the total radioactivity, an average of 0.13%. The highest level (0.9%) was found in shark cartilage, the lowest levels in muscle and liver (Table VII). TABLE VII are ‘ on rom dy whey i A, wok sents PERCENTAGE OF Sr®—-¥9, AND TOTAL DISINTEGRATION RATE PER GRAMME WET WEIGHT, OF FISH SAMPLES COLLECTED AT ENIWETOK DURING 1954—1955 { | Eniwetok* fo | Date ee , Baracuda muscle Bonito muscle | Shark muscle Shark skeleton | Butterfly-fish liver ; Blue Bonito muscle Shark muscle | Mullet liver | Blue Bonito liver | | | | Foncentage Fo | 7/6/54 7/27/54 : | 10/27/54 | 10/27/54 10/27/54 1/18/55 BtL0/55 2/12/55 2/12/55 Tote‘werent 1 0.08 0.02 0.1 0.9 0.01 ! 0.01 | 0.02 | ; | ; | 3 64 1,500** 4,900** 5O00** 3,700 0.02 160,000 0.03 1,400 83 | | * South, unpublished ** d/mjg dry weight Lowman, PaLtumsBo and SoutuH (9), in ion-exchange separations on bonito liver collected at Bikini Atoll, did not find Sr®, although the total radioactivity in the sample was 50,000 d/m/g wet weight. SUYEHIRO et al (29), in laboratory studies of the uptake of Sr® in aquatic animals, reported that fresh-water fish took up Sr®° much more readily than did marine fish, which accumulated less than one per cent of the amount available. Suyehiro attributed the reduced uptake in sea water to salinity. However, other factors, including isotope dilution and dilution by stable calcium, were probably the primary causes for reduced uptake. Boroveus ef al (14) found that approximately one to two per cent of Sr89 which had been fed to 10 yellowfin tuna was retained after a period of 24 hours, and that another fish (Tilapia) contained on the average only about 7 1/2°% of the ingested amount after 4 days. These animals were subjected to acute exposures of Sr®, and the results would probably differ from those from a chronic exposure. Because marine organisms are able to concen132