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<br />5 <br /> <br />Predation Assessment Results: Brown Trout <br />n1rout(>250mm) Observa~ons E!;tlmaledF'aramelers PllldalorCll3racterlstlcs PopulatlonCllaracterlSllcs <br /> Mean Median Mean Median <br />... locatlon " . Pred% sf. C, TL""o ',"m '.... Tll'<>" <br />AA,,^,,' AbwelCR " 2.04% ,."" om ... ... "" '" <br /> BelowlCR " 18.18% 6.11% "" 'ro '" '" "" <br />EBRUARY AbovelCR 11.11% ,,,'" 0"", ." '" '" '" <br /> BelowlCR " "00% 12.(14% 0.207 ,~ '" '" '" <br />""'" AboveLCR 000% '" '" <br /> BelowLCR 33.33% 1321% 0.471 '" '" "" '" <br />MBINED Tolal " "" 1524% ,,,. 0,"0 '"' '" '" "" <br /> Above lCR , " 313% 1.84% 0.696 'ro '" '"' <br /> BelowLCR " " 34.15% 4.2% 0.217 ." ,,, '" '" <br /> so 00% <br /> OABOVElCR <br /> 70.00% .BElOW lCR <br /> SO.OO% <br /> SO.OO% <br /> 40.00% <br /> "'00% <br /> 20.00% <br />III USGS 10.00% <br /> 000% <br /> January February March TOlal <br /> <br /> <br />2003 Results Highlights <br /> <br />. Non-native removal efforts more effective than <br />anticipated. > 50% efficiency for Rainbow Trout with 5 <br />passes. <br /> <br />. Immigration rate >800 fish/month in the LCR Inflow <br />Reach. <br /> <br />. Hoopnet catches of HBC may indicate a habitaUsurvival <br />response by HBC following non-native removal. <br /> <br />. Brown Trout much more piscivorous than Rainbow <br />Trout. Both species more piscivorous below the LCR <br />Confluence. <br /> <br />. Rainbow Trout dominant prey item are simulids. <br />Dominant prey items for Brown trout are fish, <br />gammarus, and simulids. <br /> <br />Il'iUSGS <br /> <br />023'28 <br />