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Last modified
7/14/2009 5:02:30 PM
Creation date
5/22/2009 7:10:36 PM
Metadata
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UCREFRP
UCREFRP Catalog Number
7611
Author
U.S. Bureau of Reclamation.
Title
San Juan River Rare and Endangered Fish Study River Miles 16.2-(-)2.0 1987 Field Season-Draft Report.
USFW Year
1987.
USFW - Doc Type
Durango, Colorado.
Copyright Material
NO
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.s <br />distinct frequencies, along with subsequent follow-up radio-teleaetry aoni- <br />J coring, is currently the beat method known. If enough adults could be aoni- <br />tored, important spawning areas could be located and e~entnally aodeled <br />hydraulically. Through the uae of modeling, optimum or mintenaace floe recoar <br />emendations could be projected. <br />Also, additional information is needed on the survival rate of aquawfiah <br />through the first year of life. Physical habitat requirements, fish migration <br />barriers or traps, and infra-specific competition are three areas of additional <br />data requirements. Obtaining these data could require a longer term collection <br />period, extending through the winter. <br />Although not directly tied to the San Juan River, the spanning success of <br />razorback suckers in the San Juan arm of Lake Powell needs to be quantified. <br />Once a spawning aggregation is identified, the area could be sampled by <br />trawling a fine-meshed larval seine across the suspected redds. <br />Finally, these data shoe that the San Juan River remains an important hab- <br />itat to the Colorado squawfish, but, there still remains significant data gaps <br />in defining the life-cycle requirements of the species in the river. Addi- <br />tional study will better define these needs so that whatever recommendations <br />are made are based on a sound data base and not on conjecture. <br />23 <br />
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