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Last modified
7/14/2009 5:02:33 PM
Creation date
5/17/2009 11:30:34 PM
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UCREFRP
UCREFRP Catalog Number
8129
Author
Mueller, G.
Title
Restoration of the Razorback Sucker in the Colorado River, Southwestern United States.
USFW Year
1997.
USFW - Doc Type
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Copyright Material
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<br /> <br />nursery habitats. In some areas, levees are being removed to allow for natural flooding. Water quality and land <br /> <br />use issues are being increasingly scrutinized. <br /> <br />While we have spent 3 decades studying and restoring physical features, biologists have generally either ignored <br />or not recognized the conflicts between native fish communities and the goals of optimizing recreational fisheries. <br />It wasn't until recently that fishery managers have seriously examined the impact that recreational fisheries are <br />having on native populations. This transition has been difficult. Unfortunately, most fish management programs <br />in the USA are funded primarily through the sale of fishing licenses. Programs were focussed on recreational <br />fisheries while native fish communities at best were ignored, and in some cases were even eradicated to enhance <br />non-native fish production (Holden 1991). However, this management philosophy is changing. During the past <br />5 years, new regulations have restricted the introduction of new fish species, limited recreational stocking to <br />specific waters, and possibly reduced non-native fisheries through increased creel or mechanical harvest. These <br />changes in management philosophy have occurred due to research, environmental legislation, increased public <br />awareness, and the growth of environmental activist groups. <br /> <br />Stocking Augmentation <br /> <br />The plight of the razorback sucker was recognized in the 1960's and efforts to Federally protect the fish intensified <br />in the late 1970's. The Federal listing process includes designation of critical habitat which is often controversial <br />with water and land development interests. A political compromise was reached in 1980 which allowed for a <br />10-year massive stocking program in Arizona if Federal listing were postponed (Johnson 1985: Minckley et al. <br />1991). The object was simple: to reestablish self-sustaining populations of razorback suckers in their fonner <br />range. It was hoped that by stocking razorback suckers in generally pristine river reaches they would establish <br />self-sustaining populations, thus eliminating the need for Federal protection. Stocking was restricted to larger <br />portions of the river system, away from major reservoir or diversion structures. <br /> <br />Young suckers were propagated at Dexter National Fish Hatchery, New Mexico, and stocked in the upper reaches <br />of the Gila, Verde, and Salt Rivers. Here, and elsewhere, grow-out and rearing facility space is extremely <br />limited. Annual production was geared at producing hundreds of thousands of smaller fish, rather than fewer but <br />larger fish. Survival rates were evaluated of the different sized fish stocked. Post-stocking surveys jndicated <br />larval suckers were gone and only the larger stocked juveniles had survived (Brooks et al. 1985). Follow-up <br />monitoring suggested non-native fish predation was a serious problem. Researchers discovered that channel <br />catfish (Ictalurus puncta/us) on average had consumed six razorback suckers apiece. Based on the standing crop <br />of catfish, researchers estimated several thousand stocked fish could be lost to predators in just 72 hours (Marsh <br />and Brooks 1989). <br /> <br />Over 12 million razorback suckers were stocked during the 1 O-year program. Follow-up sampling recaptured less <br />than 100 razorback suckers suggested there was extremely poor survival. Among those few fish that did survive, <br />no successful recruitment or spawning attempts have been reported. The massive stocking effort was <br />unsuccessful in reestablishing populations, let alone self-sustaining populations, and the U.S. Fish and Wildlife <br />Service (USFWS) proceeded to have the razorback sucker listed as endangered in 1990. <br /> <br />Recovery Program <br /> <br />The first recovery program for Colorado River fishes began in 1976 with the creation of the Colorado River <br />Fishes Recovery Team ( Miller 1982). The Colorado River Fishery Project office was opened by the USFWS in <br />1979. A conference was held in 1980 that consolidated existing knowledge and had leading experts discuss <br />recovery needs. Initially, activities focused primarily on research, field surveys, and the development of recovery <br />
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