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Sensitive areas for each species of fishes were determined by the following <br />methods; as adopted by UCRSCC (1984): <br />1. Colorado squawfish <br />a.) Spanning areas <br />Confirmed and suspected spawning areas were identified from an <br />inspection of substrate records, radiotelemetry, collections of <br />ripe adults and larvae. The following criteria were used to <br />confirm spawning areas: <br />1. Occurrence of deep pools interspersed with cobble/riffle <br />habitat; and <br />2. Collection of ripe female Colorado squawfiah (strippable <br />eggs) and observation of two or more radio-tagged adult <br />Colorado squawfish within a 8 km reach during the <br />suspected spawning season; and <br />3. Presence of larval Colorado squawfish < 15 mm TL collected <br />within 32 km downstream of a reach. <br />b.) Suspected Spewing Areas <br />A different set of less restrictive criteria were used to identify <br />suspected spawning erase: <br />1. Collection of ripe male Colorado squawfish (strippable <br />milt} or one or more radio-tagged Colorado squawfiah in <br />the areas during suspected spawning period; and <br />2. Occurrence of larval Colorado squawfish < 25 mm TL <br />downstream; and <br />3. Occurrence of deep pools interspersed with cobble/riffle <br />habitat. <br />c.) Larval drift areas <br />Distribution areas of high concern are those in which larvae < 15 mm <br />TL are reported from seine sample a. <br />d.) YOY (poet larval) nnraerq area <br />21 <br />