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1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br /> <br />Suggestions for reseazch that would aid modeling efforts for razorback sucker Xyrauchen <br />texanus include: <br />1. Experimentally determine probability of capture and attack rates by red shiners and other <br />predators on eazly life stages of razorback sucker so that the IBM model can be adapted <br />for this species. <br />2. Develop relationships that describe effects of water temperature and food density on <br />growth of razorback sucker. Effects of water temperature (range 16-25°C) on growth of <br />eazly life stages of razorback sucker under high food rations have already been <br />investigated in laboratory experiments (K. Bestgen, unpublished data). <br />3. Conduct laboratory and field studies to describe relationships of discharge, water <br />temperature, habitat availability, and abundance of alternate prey with abundance, <br />growth, survival, and size-structure of razorback sucker and important non-native fishes <br />in the Colorado River Basin. <br />Acknowledgments <br />Funding for this project was provided by the E. Wick of the National Pazk Service and <br />the C. Stalnaker of the Midcontinent Ecological Science Center, U. S. Geological Survey. Wick, <br />Stalnaker, and S. Williamson provided helpful comments during proposal development. <br />25 <br />