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Last modified
7/14/2009 5:02:29 PM
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5/20/2009 10:36:29 AM
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UCREFRP
UCREFRP Catalog Number
7048
Author
Desert Fishes Council (Edwin Pister, e.
Title
Proceedings of the Desert Fishes Council
USFW Year
1991.
USFW - Doc Type
Volumes XX and XXI
Copyright Material
NO
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Management for Recovery of Colorado Squawfish <br />Harold M. Tyus <br />U.S. Fish and Wildlife Service <br />1680 West Hwy 40, Room 1210 <br />Vernal, Utah 84078 <br />ABSTRACT <br />The Colorado squawfish, Ptvchocheilus lucius, once widespread and <br />abundant in mainstream rivers of the Colorado River Basin, has been extirpated <br />from about 75% of its historic range. It is most common in the Green River <br />Basin of Colorado and Utah in habitats that have been little affected by water <br />resources alterations. Intensive research and management efforts by federal, <br />state, and other institutions, have provided a basis for conservation of this <br />species only recently - largely persuant to passage of the Endangered Species <br />Act of 1973. This study demonstrated that conservation and management for <br />recovery of Colorado squawfish can only be accomplished with a full <br />understanding of the complex life cycle and ecological relationships of this <br />fish. A major factor in the conservation effort is provision of a proper <br />hydrologic regimen. Flows identified as providing suitable nursery habitats <br />have resulted in successful recruitment, and shown that water management, not <br />water quantity alone, is most important for future recovery of the fish. <br />Although the endemic Colorado River fauna may never be restored to its former <br />composition and abundance, even in smaller subbasins, conservation and <br />recovery of this species is possible in the remaining habitat if preferred <br />habitats are optimized and life history needs are met. <br />RESUMEN <br />E1 Colorado squawfish, Ptvchocheilus lucius, a una vez muy extensivo y <br />abundante en los rios mayores de la cuenca del Rio Colorado, ha lido eliminado <br />de/aproximadamente 75% de su alcance historico. Es mas comun en la cuenca del <br />Rio Verde de los estados de Colorado y Utah en la habitat que no se ha <br />afectado mucho por alteraciones de recursos actualicos. Investigaciones <br />intensivas y enfuerzos de manejo por instituciones de gobiernos federal, <br />estatal, y varios otros, han proveido una base par a conservacion de este <br />expecie solamente recientemente - mas bien despues de adopcion de la ley para <br />proteccion de espgcies amenazados? "Endangered Species Act of 1973'. Este <br />estudio demonstro que conservacion y manejo para refobre del Colorado <br />squawfish se puede cumplir solamente cog comprension completa del ciclo <br />complejo de vivencia y relaciones ecolog gas de este pez. Un factor mayor en <br />la efuerza de conservacion es la provision de un propio regimen hidrologico. <br />Flujo identificados que proveen la propia habitat para criadero han resultado <br />con Yzito del crecimiento de la poblacion, y han muestrado que el manejo <br />acuatico, no solamente la calidad de aqua, es/lo mas impgrtante para el <br />recobro futuro del pez. Aupque la fauna endemica del Rio Colorado no se pueda <br />restablecer a su composicion y abundancia anterior, hasta en las cuencas mas <br />pequenas, conservacion y recobro de este especie es posible en la habitat <br />disponible si se puede proveer mas de la habitat que se prefiere y se <br />satisfechan los requerimientos de vivencia. <br />51
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