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Home > Society and Social Sciences > Politics and government > The Role of Stocking in the Reestablishment and Augmentation of Native Fish in the Lower Colorado River Mainstream (1998-2002): Open-File Report 2003-288
The Role of Stocking in the Reestablishment and Augmentation of Native Fish in the Lower Colorado River Mainstream (1998-2002): Open-File Report 2003-288

The Role of Stocking in the Reestablishment and Augmentation of Native Fish in the Lower Colorado River Mainstream (1998-2002): Open-File Report 2003-288


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About the Book

The Colorado River has experienced dramatic physical and biological change. Rated as the fifth largest river in the USA by volume, today its waters seldom reach the sea. Water diversions gradually reduce its flow to a point where its last remaining waters are diverted at Morales Dam leaving nearly 100 km of historic channel dry. In contrast, lower basin storage reservoirs cover 36% of the historic channel. Remaining portions of the flowing river have been channelized and straightened to a point where it now resembles a large canal. Levees, mechanical dredging, and the natural forces of erosion have degraded the river channel nearly 2 m in some locations, isolating it from its floodplain and affecting local water tables. The river no longer functions as a natural stream system characteristic of spring run-off, summer spates, and droughts. Today it serves as a water storage and conveyance system to meet human needs. Physical change has been severe, but not as devastating as the biological pollution. More than 80 nonnative fish species have been introduced to the lower basin. Today, over 20 fish species have established, many forming economically important sport fisheries. As these alien species expanded their range, native communities rapidly declined and disappeared from much of their historic range. By 1930, most had become rare. The last remnant populations of bonytail, razorback sucker, and Colorado pikeminnow in the lower basin were taken downstream of Davis Dam during the 1960's and 1970's. Today, Colorado pikeminnow, and it appears, wild bonytail are extirpated downstream of Glen Canyon Dam, and wild razorback suckers are extremely rare. The Colorado River and its fish assemblage is a totally different ecosystem than it was a century ago. State and federal agencies have been attempting to reestablish native communities for nearly three decades. More than 12 million razorback suckers, most of them small, were stocked between 1981 and 1991. Few


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Product Details
  • ISBN-13: 9781288745180
  • Publisher: Bibliogov
  • Publisher Imprint: Bibliogov
  • Height: 246 mm
  • Sub Title: Open-File Report 2003-288
  • Width: 189 mm
  • ISBN-10: 1288745184
  • Publisher Date: 11 Feb 2013
  • Binding: Paperback
  • Spine Width: 3 mm
  • Weight: 113 gr


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The Role of Stocking in the Reestablishment and Augmentation of Native Fish in the Lower Colorado River Mainstream (1998-2002): Open-File Report 2003-288
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