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<br />oc.... <br /> <br />2/22/96 4. What is relative vulnerability of various fish species and life <br />stages to various gears/sampling strategies that will be used <br />to evaluate levee removal? <br /> <br />IV. Study Goals, Object i ves, End Product: <br /> <br />Goal <br /> <br />To restore and manage Old Charlie Wash to test hypotheses on <br />floodplain habitat and restoration of razorback suckers. <br /> <br />Obiectives <br /> <br />I. Maintain the structural integrity and usability of Old Charlie. <br />2. Test hypotheses on: <br />a. use of floodplain depressions by endangered fishes. <br />b. benefits of floodplain depressions to endangered fishes <br />and nonnative fishes. <br />c. management/control of nonnative fishes. <br />2/22/96 d. relative efficiency of sampling strategies/gear types, in <br />support of levee removal evaluation. <br /> <br />End Products <br /> <br />I. A floodplain depression that will be managed to benefit <br />razorbacks and other endangered fishes and to test hypotheses. <br />2. A final report with conclusions and recommendations. <br /> <br />V. Description of past performance on this or similar projects: <br /> <br />Old Charlie Wash has been developed and fitted with inlet and outlet <br />water control structures and fish screens. During 1994 the site was <br />allowed to fill with water durin9 spring runoff, but larger fishes <br />got into the site through holes in the old outlet structure. Larval <br />razorback suckers were captured and placed into the site, but none <br />were recaptured during draining of the site in October. It is <br />possible that razorbacks escaped from the site through holes found <br />in the outlet structure during draining. Physical, chemical, and <br />biological conditions at the site were monitored throughout the <br />season, and most appeared to be favorable for razorback rearing. <br />Predation, escapement, and mid/late season plankton densities may <br />have been factors affecting results. <br /> <br />During 1995, repairs were made to the inlet and outlet water control <br />structures, and a fish harvest kettle was installed. Spring flows <br />during 1995 over-topped the levees, allowing fishes of all types and <br />sizes into the site. Therefore, fish control structures could not <br />be evaluated. Ten adult razorbacks were collected in Old Charlie <br />during the sampling period (May 23 to September 25). During <br />draining of the site, (September 25 to October 13), 631,798 fish (15 <br />species) weighing 22,321 pounds were harvested (adult carp 77% by <br />weight; fathead minnows 71% by number). Harvest included 28 young <br /> <br />2 <br />