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•~ <br />t' ~~ • • G <br />. change the test levels of pH from 6.4, 7.4 and 8.4 to 7.5, 8.4 and 8,5 <br />in bioassays with juvenile squawfish. <br />. I4ETFIODOLOGY <br />Chemicals <br />The chemicals to be tested are listed below in order of their priority. <br />They were selected because they occur in the.Colorado River drainage and <br />because considerable collateral data exist on how they affect a variety of <br />other species. <br />Inorganic <br />Seleni~ <br />Zinc <br />Copper <br />Chlorine <br />Acamonia <br />Mercury <br />Cadmium <br />Lead <br />Organic <br />DDT <br />Dieldrin <br />Endrin <br />PCB <br />Parathion <br />Chlordane <br />Lindane <br />Toxaphene <br />Fourteen inorganic chemicals were originally proposed for bioassay. <br />Subsequent to the original-proposal, dais number was reduced to eight and <br />ammonia was substituted as a chemical for consideration.- Consequently, <br />.. during this reporting period, five chemicals from the .original-list of 14 <br />~ were used. These chemicals {arsenic, cyanide, iron, manganese and nickel) <br />will be presented in this report: ,No further work is planned with these <br />chemicals for the duration of the project: ' <br />Fisch <br />As Colorado squawfish (Ptychocheilus lucius) was not available during <br />this reporting period, the northern squawfish (P. oregonensis) was substituted <br />as a'~erdgafe species. ,Northern squawfish were seined principally in tine <br />St Jee ~t~~+s~, Ydeho~, ilia tributaries and backwater areas. <br />