18304. fobeet ee FOR THE MONTH OF NOVEMBER 1948. Project I# Basic studies on the effect of X-rays upon fish in various stages of development. Sections I and IIs The eggs obtained from the five (5) year old chinook salmon aoe fenale, warked A. and R. , of the "control® stock contime to develop Re ati;the Samish Ratchery, State of Washington Department of Fisheries, As soon as these eggs develop to the "eyed™ stage they will be transfered to the Applied Fisheries Laboratory, University of Washington, to contime their development. A very critical study will be made of the young fish produced to add to our knowledge of the variations expected in "control® but possibly inbred stock. , Section XT Rainbow trout yearlings, females and males, from University of Washington stock were exposed to 50, 100, 500, 750, 1000, 1500 and/or 2500 r. A total of 128 yearling (nearly two years old) were irradiated in Jamiary 1945. An additional 20 fish were used as controls, ‘The effect on the offspring of this stock to the. exposure to X~rays prior to their first spawning (Spring of 1945) was described in the report "Some effects on embryos and young rainbow trout (Salmo gairdnerii Richardson) from exposing the parent fish to X-rays" UWFL-~10, “Project and section numbers refer to the Project Chronology Chart and heeeeeemeine asPesan m ee * ey