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<br />19 <br /> <br />4. Intuitively (in the absence of statistically significant <br />data) we would suggest the following scenario to optimize <br />year class strength of YOY squawfish preparing to <br />overwinter: Early and high spring flows, with a secondary <br />flow spike increase of over 25% after water temperature has <br />increased to 20 degrees Centigrade; and low and stable <br />summer and fall flows that maintain a minimum temperature of <br />over 13 degrees C until late October. This should stimulate <br />early spawning and allow for adequate growth of YOY <br />squawfish, which will increase overwinter survival and may <br />eventually increase recruitment into the adult population. <br />Flows recommended by Tyus (1989) should be correlated with <br />spawning, age and growth, and survival of post larval <br />squawfish. <br /> <br />5. Results of the Interagency Standardized Monitoring Program <br />should also be correlated with results of overwinter <br />survival sampling. This may provide a link between spawning <br />success, survival of young, and recruitment into the adult <br />population. <br /> <br />LITERATURE CITED <br /> <br />McCada, C. W. and L. R. Kaeding. 1989. Relationships between the <br />habitat use of age-O Colorado squawfish and those of other <br />sympatric fishes in the Upper Colorado River Basin. Final <br />Report. U.S. Fish and Wildlife Service. Grand Junction,Colo. <br />41 pp. <br /> <br />McKay, T. S. and J. A. Hawkins. 1990. An investigation into the <br />unusual appearance of early juvenile Colorado squawfish in <br />the lower Green River during spring standardized <br />electrofishing. Utah Div. of wildl. files, Price. 15 pp. <br /> <br />Nessler, T. P., R. T. Muth, and A. F. Wasowicz. 1988. Evidence <br />for baseline flow spikes as spawning cues for Colorado <br />squawfish in the Yampa River, Colorado. Amer. Fish. Soc. <br />Symposium 5:68-79. <br /> <br />Thompson, J. M. 1989. Lipid content and survival of age-O <br />Colorado squawfish. M.S. Thesis, Colorado State Univ., Ft. <br />Collins. <br /> <br />Tyus, H. M. and C. A. Karp. 1990. Habitat use and streamflow <br />needs of rare and endangered fishes: Flaming Gorge studies. <br />U.S. Fish and wildl. Servo PUbl., Vernal, utah. 57 pp. <br /> <br />ISMP2.RPT <br />