We staried to get apprecia oF surprising to us. 2 mortalit ies when we raised. the tomporature perhaps two or three cegrecs Centigzade, and thes2 temo tava raises are considerably greater than those created by the effluent goings into the river. I would like to point that out, Also, Sinca wo have run that, we found within this spscics there is a considerable temperature diitierenca, This has been showm, too, with the work at the Applied lisherics Lapovatory. “We ran these oa Fuget Sounc because these ezcs are a lot enusior to get and ve Got thesa from strains that inhabit the Columbia River. Gur leccl strain aro used to spavming in on Warner water than is characteristic of this particular species by a natter of a few degress, The tolerance of the lecnl fish 28 slightly greater than it is for these. A sesond experiment shows that these mortalities -we can shift this (indicating) up a couvle of degress from where it is nov. Enovgh for the temperature factor. . Let us now get back out into the Columbia River. These sampling staves have bc2en selected for several roasons. One is to try to catch the spot where concentrations of radioactive material are high. Also, we try to solect them so that hydrographically they are as similar as pessible. Wa try to select shallow, gravel river arsas whero the current speed was