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`, • . <br />,- ',+~ ~ 1 <br />t <br />~• TITLE <br />~~~ <br />Acute toxicity of lb selected chemicals to the dolorado squawfish, <br />an endangered species. <br />OBJECTIVES <br />To determine the relative toxicity of eight organic and eight inorganic <br />toxicants to the Colorado squawfish. <br />i <br />Specific Objectives <br /> <br />~1. To determine the statistical LC50 and 95x confidence limits of <br />selected chemicals far three life stages (postlarval, juvenile <br />and subadult) of squawfish at a water temperature of 17 C. <br />2. To determine the statistical LC50 and 95X confidence limits of <br />selected chemicals for juvenile squawfish at water temperatures; <br />of 12, 17 and 22 C. <br />3. To determine the LCSO and 95~ confidence limits of selected <br />chemicals far juvenile squawfish at three salinities (Palouse <br />River water, artesian well water, University of Idaho, and <br />simulated Willow Beach water, Arizona) at a water temperature of <br />17 C. ~ ' <br />4. To determine the LC50 and 95"6 confidence limits of selected <br />chemicals for juvenile squawfish at three levels of pH (6.0, 7.®~ <br />and 8.C) at a temperature of 17 C. <br />The original specific objectives of the project have been modif ied_to <br />exclude salinity studies with Palouse River water and artesian well water- <br />If possible we will test squawfish with simulated water from an upriver <br />pofi~t +af supply usir~ artesian well water as a base. Secondly, we plan to <br /> <br />