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I I I I I I I I I I I I I I I I I I I General application of the match-mismatch principle to en- hancement of flooded bottomland habitats as nursery areas for endangered Colorado River fishes. Match Mismatch Phvsical Considerations Water Supply Surface Water Groundwater Frequency of Inundation River Elevation at Flooding Water Depth Water Duration Control of Water Levels Control of Water Exchanae Manipulation of Water Temp. Possible Sediment Control x 1 in 5 Yrs. 1 in 5 Yrs. 1 Meter or > 5-6 Months Yes Yes Yes Yes Bioloaical Considerations Ecosystem Approach Status and Trends of Stocks Genetic Manaaement Possible Imprintina Larvae Possible Batch Marks for Identification of Captive-Reared Fish Size of Captive-Reared Fish at Release (Total Length) Timing of Release Diel Night Seasonal Low Flows " Temp. > 50 F " Summer/Spring Access and Exit for Fish Present Vegetative Cover Present Control or Predators/ Competitors Nonnative Fish Necessary Predacious Invertebrates Possible Wading Birds (Water Depth) 1 Meter or > Diving Birds (Veg. Cover) Present Raccoons (Water Depth) 1 Meter or > River Otters (Veg. Cover) Present Yes Known Yes Yes Essential 150 mm or > Chemical Considerations Acceptable Water Quality Dissolved Oxygen Supersaturation of Nitrogen pH Selenium (in Water) Heavy Metals Pesticides or Herbicides Low Salt > 5 ppm 100% or < 7.0 or > 2 ppb or < Absent or Low Absent or Low I I I X I < 1 j n c:: Yrs. i 5 Yrs. or > < 1 r~ete!"" 3 or < Ma. No No No No No Unknown No No Not Possible < 150 mm Daylight High Flows Temp. < 50 F Winter Absent Absent None Not Possible < 1 Meter Absent < 1 Meter Absent Highy Saline < 5 ppm > 102% < 7.0 > 2 ppb Present Present Table 1. Environmental Conditions Favorable to the Growth and Survival of Larval Razorback Suckers