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F A=fathead minnow, GS=green sunfish, RS=red shiner, SB=brook stickleback, SS=sand shiner, WS=white sucker ...................................26 Figure 12.Fish composition and abundance collected with fyke nets from Old Charley Wash in 1996. Numbers on top of stacked bars represent average catch per net. Species abbreviations are: BB=black bullhead, BC=black crappie, CC=channel catfish, CP=carp, FL=flannelmouth sucker, GS=green sunfish, RS=red shiner, SS=sand shiner, WS=white sucker, FLxRZ=Flannelmouth sucker x razorback sucker hybrid, Misc NN=miscellaneous nonnative fishes .......................27 Figure 13.Comparison of mean number offish captured in emergent vegetation, open water (with or without emergent vegetation) and flooded terrestrial vegetation with fyke nets, minnow traps (both tall and short) and trammel nets in 1996 from Old Charley Wash .......................................................... 31 Figure 14.Comparison of mean number offish captured by depth with clover-shaped minnow traps (tall and short) and fyke nets in 1996 from Old Charley Wash. Abbreviations: RS=red shiner, F A=fathead minnow, CP=carp, GS=green sunfish. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32 Figure 15.Biomass ofage-O (shaded) and greater than age-l fish (open bar) collected during the draining of Old Charley Wash in 1995 and 1996 ........................38 Figure 16.Comparison of adult nonnative (A) small nonnative cyprinid (B) age-O nonnative and native (D) fish captured in the outlet in the days following the initiation of draining. Species abbreviations; LCP=carp age> 1 +, CC=channel catfish age> 1 +, LGS=green sunfish age> 1 +, LBB=black bullhead age> 1 +, SCP=carp age-O, SGS=green sunfish age=O, SBC=black crappie age-O, SBB=black bullhead age=O, F A=fathead minnows all ages, RS=red shiners all ages, CS=Colorado squawfish age-I, flannelmouth sucker juveniles, RZ=razorback sucker age-O .......... 40 Figure 17.Comparison of zooplankton collected (dotted line) from Old Charley Wash in the spring and summer between 1994 and 1996 with river discharge (light solid line) measured in Jensen and the duration of larval razorback sucker collected in the Middle Green River (heavy horizontal line). The larval razorback duration line is located at the 447 m3/s scale to compare larval presence with floodplain connection, and the flows in which most backwaters appear (l09 m3/s) is noted with an arrowhead ................................................ 46 LIST OF KEYWORDS Razorback sucker, age-O, zooplankton, nonnative fishes, floodplain, temperature, wetlands, juvenile, growth, survival, Old Charley Wash, Middle Green River, gear efficiency, biomass 6