(1) Contaminatec. Tuna, (2) Apprehension of long-range contamination of Janan °nl its fish- ing grounde, (3) Rediological factors affocting tho fishermen: (2) Zstimating tho wholo bocy doso, (bd) Estimatod dose from internel enitters. Conteninete Tuna Sone of the Japanose Government officinle =r. alroncy referring to the lattcr half of March as tho "creat tuna panic™, The origin of this penic both in the United Statcas ant Japan is worthy of caroful stucy. . The oxtcnt of the tune consumption in the United States and Japen Ceclined curing the scocond half of Merch is not known to no at this timc, for a coy orior to my ccperturc from New York on March 19, anc for 2 wecks following: my arrival in Tokyo on Merch 22 the subject of radioactive tune wre & subject of popular conversation, When once considers the reaction of tho informec Ancrican outliec to tho possibilitics of contamination of tuna it is not surprising that the Japancss wore stampodeda into approhension over the imc iste prospects of their coating radioactive tuna ant. th long-range prospects of their fishing srouncs being ruined, (A) Tuna Fishin: Industry of Javen L/ The Jazancse fishing flect at the present time consists of about 1,000 vessols opor~ting cut of ton major ports, The annual valuc of the tuna catch apvroximetes $26 million, The princij;-l export specivs is altacor, Sixty porcont of the lanccd albacor catch went to Japsnese cemners enc forty percont was shipped abroac in freezors, Sixty porcont of the albacor are ccught in the summer sorson which extcon"s from May through July, During this season, the fishins crounds aro located relatively close to the 4siatic coset. During the wintcr months, Janusry throuzh Merch, the Japencsc vosscle range far out to sca, The wintcr sexson sccounts for forty pereont of the annual extch, (3) Conteninetce Tuna in Japen Tho Fukuryu Maru landod at Yaizu with e catch of 28,000 pouncs cf tuna, Wo mst accopt the fact that those tune were cxcecasivoly con temineatoc anc that the cccision of the Japanose to Cispose of these Lb. An cxecllont report of technical inform-tion about the Japanese tuna fisherics in Japan is Report No, 104 issuec by the Natural Ro- scurces Soction of SCsP in Merch, 1948,