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5 <br />spawning area under very different conditions in 2000 compared to 1984 suggests that <br />physical variables or cues other than depth and velocity influence use of the Green River <br />spawning area. Use of the Green River spawning area by hatchery fish stocked <br />previously at various locations in the Green River was documented by telemetry and <br />indicates that mechanisms other than natal imprinting influence site selection. <br />Razorback sucker used the Green River spawning area during very different flow <br />and habitat conditions during 2000 and 1984. This result is consistent with other studies <br />showing flexibility in razorback sucker spawning behavior including the possible use of <br />multiple spawning sites. Conversely, previous studies indicate that environmental <br />requirements for survival of larvae are fairly narrow and must include access to food-rich <br />backwater habitats. Although sediment deposition in spawning areas could limit <br />recruitment during some years, it appears that larval access to floodplain habitats is <br />potentially a more restrictive reproductive bottleneck over long periods of time.