2 Seotion Ii-b Cea The ootual experinental work in this section has occupied almost ths antire attention of the steff durins the monthe Tho adult fish, the proceny of irradited or “control” parents, continucd to spawn. been obt:ingl ani the A totel oF 298 esr lots hve eaca sturted to develope the ecss when removed from the fearless and fortiliazed with the spawn Of insoles of like irradiation axpearience have been retainod in iadividucl somportuentsa durian the incubetion period and the absorption of the yolk sace imming this poriod the ounmbers of egas and fry te dio during each ataze of dovelopmant was recorded. The numbers and kind of malformtions were also deternined. The great nusbers of youn; fish produced in the project made it necessary to reduces tle nwsbers retained, ance they reached the fooding stase. 7orticns of aach lot were retained to wake a total sauple of 4000, for the control lots, 2000 for each of the 50 r, 100 r, 500 r, and 750 r lots and 654 for the 1000 r lote. Only a totel of 654 fry survived from the ese3 oF the udult fiah fron purents exnosed to 1000 r pricr te spowning in tho aprins of 1945. The samples being dtained o¢ the vouns “lsh ure bein: studied for the effacts of irradi. tion or ihe 3rd zsner:tion during the feeding atazgea. nections SY-sVIT Two adult Ash, one salo aml one fomule, returned t this Laavesrorth itutdioun, during the uonth after two year absence, durin’ which they sicrated to sea, fed for a time and returned uz tuic Columbia River, enterci tha ‘enatehoe Bivor, und finally turned int. the Leavanwerth holdin: j:ormis on icicle creak. _ Ween DOS ARCHIVES