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<br />YOY (25-6Om) Colorado squawfish Nursery Areas <br /> <br />Assumptions : <br /> <br />1. Young-of-the-year Colorado squawfish between 25 and 60 mm <br />utilize ephemeral backwater areas with a silt, sand substrate <br />which are important to their continued growth and survival. <br /> <br />2. These important habitats can be best defined by seine catch <br />rates for this size-class. <br /> <br />Classification: High density areas <br /> <br />Criteria <br /> <br />1. Average catch per effo2t for years of record of YOY with <br />seines exceeds 0.9/l0m . <br /> <br />2. Presence of significant backwa ters. <br /> <br />3. Presence of silt/sand substrate. <br /> <br />Classification: Major nursery areas <br /> <br />Criteria <br /> <br />1. Catch pe2 effort of young-of-the-year greater than <br />0.09/l0m . <br /> <br />2. Presence of significant backwa ter areas. <br /> <br />3. Presence of silt/sand substrates. <br /> <br />Classification: Distribution <br /> <br />Criteria <br /> <br />1. Areas whereYOY have been collected in the past five years. <br /> <br />Data Sources: <br /> <br />CRFP data files and various reports, 1979-1984 <br /> <br />Archer, D. L. et al. 1984. Colorado River fishes monitoring <br />project, second annual report. pp. 21-26. <br /> <br />Miller, W. H. et al. 1984. Windy-Gap fishes study, second <br />annual report, CRFP Salt Lake City, pp 29-33. <br /> <br />Data Summaries: Table 4, Figure 10 <br /> <br />14 <br />