fo Cy re ge hog SUMMARY OF OPERATIONS ON CONTRACT NO. ¥-28-094-eng-338p > tye “ey a "fale POR THE MONTH OF APRIL 1948. aen LOOS 1 Project I.# Age a ch Basic studies of the effect of X-rays upon fish tn varkayg2" stages of development. OPENN EN gf iz fopt en |i TR o fo bal ft ate: Section I and II# [[] ict Authorizes for Pubic Release Date: The young chinook salmon fingerlings (F, generation) produced from the 1947 spawning of adults from irradiated (Loo r) and control stock continue to develop. R Mortality records were kept on the loss experienced by the offspring of each female. Total cumlative mortalities as well as the periodic mortalities at various stages of development are being tested for statistical significance. These data together with a summary of th S a = SRGAR285$4ONS. UINGKE will ba reported on in an early report. a VEEN autipuaeofy NUMBER +.QUASSGe Feat ZALASSINCATION CHAUEED FO: REVIEWERS 1 wane: Lib ade Section XI a - XI b Richens sae ti ot CONTAINS BOOpt Cuas HaeRES” xe RSMEATICCARETTEED {DATe: Moshegt_. >OTNeN tae FV}: ree snerp es The young fish in these sections are the second generation (Fo) offspring of the adult rainbow trout exposed to X-rays and spawned in 1945. As a part of the study program on these fish the entire Lot were individually weighed and measured to provide data for cone tinuing the study of growth in length and weight, Some of the male fish in this group are sexually mature but no attempts were made to use their spam for fertilization experiments because of a lack of females of the same age class with mature eggs. Project ¥. Laboratory experiments using Bikini "md" and coral rocks as sources of fission Produote are Sumarisecs BEST COPY AVAILABLE # Project and section numbers note?to the Project Chronology Chart and Summary, UWFI-9, revised: ‘March 11, 1948. PF ” Do’ ARCHIVES