7.~ 1)10 aummmmyeeGe OY AN wm, vod, by 5H, SUMMARY OF OPERATIONS ON CONTRACT NO. ¥28-094-arney»Oe oY FOR THE MONTH OF MAY 1948, MeCt Mp ie} a ho Se x Project I.% Basic studies on the effect of X-rays upon fish in various stages of development. Sections I and IIs The chinook salmon fingerlings (F, generation) from the 1947 | _ spawningof adults from irradiated (100 r) and control stock were la one a oll marked during the month and their release to migrate to sea started. aT - ee >a 81S Fr 3) z nay ” The fingerling fish (F, generation) from 100 r stock were marked 2 by the removal of the adipose and left ventral fins while the fingerling 2 Bere |? Saye |} eS (Fo generation) from the control stock are being marked by the removal 5S x ae d 52 = 2s 2 of the adipose and right ventral fins. —_ Following the fin removal, for identification, the young fish are be| ve z 21k 62 Gt =& [=f ' a 1xi3902 5 2346 Jou S29 a2c RIOR GR we Ale #4, e404 oigees S085 S[ZeSaoee GSS RE SSS RIE t<S Seer oto ai> ,* gl= 43YS 25 I< > & WN 3 n fish that survive we would expect to return in the fall of 1949-1950 or 1951. The progeny of this group (F, feneration) will be carefully studied The work up to date on the fish in these sections will be summarized usta Bia “tH Those to determine the genetic changes that may occur. PLE EY VyVo BOA Bsr Ole From the Samish River the fish should migrate dow to their normal feeding grounds in the sea. Pig#igige <|2e° transporting them to the Samish River, a SAS iy alaxk Wd w12580 ing held to give time for recovery from the marking and handling, before ha AY a VeNi SS oop eo 28 = and the data presented as a basic report. t Ea i Sections XT a ~ XI b The young fish in these sections represent the survivors of the second generation (F,) offspring of adult rainbow trout exposed to I-rays and spawned in 1945. * Project and section numbers refer to the Project Chronology Chart and Summary, UWFL-9, revised March 11, 1948.