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Last modified
7/14/2009 5:02:31 PM
Creation date
5/17/2009 11:28:21 PM
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UCREFRP
UCREFRP Catalog Number
7864
Author
Modde, T. and E. J. Wick.
Title
Investigations Of Razorback Sucker Distribution, Movements And Habitats Used During Spring In The Green River, Utah.
USFW Year
1997.
USFW - Doc Type
Recovery Program Project No. 49,
Copyright Material
NO
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<br />movement. When available, the invertebrate-rich floodplain habitat created by high <br />flows provide important postspawning habitat for immature and adult razorback sucker. <br />High flows and the duration of flows which maintain connectivity of the river and <br />floodplain are, thus, important attributes in defining quality and quantity of spring habitat <br />for all life stages of the razorback sucker. <br /> <br />Inundated floodplain habitat produces higher standing stocks of invertebrates <br />than main-channel habitat. The high invertebrate production, elevated temperature, <br />and cover provided by abundant aquatic vegetation growth in floodplain wetlands <br />should provide excellent environments for growth and survival of immature life stages of <br />both native and nonnative fishes. Although large numbers of nonnative fish are <br />produced and exist in wetlands, management to enhance floodplain habitat may <br />increase the growth and survival of early life stages of razorback sucker. <br /> <br />RECOMMENDATIONS <br /> <br />1. Flow patterns characteristic of the natural hydrograph of the middle Green River <br />appear to serve as a cue to the concentration of razorback sucker at the primary <br />spawning (Escalante) site and should be maintained to concentrate spawning adults, <br />both spatially and temporally. <br /> <br />2. Because several individual razorback sucker were located on both the Escalante <br />and Yampa River spawning sites during the spawning period, it is recommended that <br />the fish in the Green River subbasin above Desolation Canyon be considered a single <br />population (Le. middle Green River population), as suggested by the RIP genetics <br />guidelines. <br /> <br />3. Evidence supports the concept that floodplain habitat is beneficial as nursery habitat <br />for early life stages and postspawning adult razorback sucker. At the same time, the <br />large number of nonnative fishes using and produced in depression wetlands causes <br />concern about the long-term management of this habitat. Information needs to be <br />gained regarding the impact of nonnative fish production in depression and terrace <br />floodplains on the survival and recovery of listed and other ~ative fishes. <br /> <br />8 <br />
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