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Last modified
7/14/2009 5:02:36 PM
Creation date
5/22/2009 5:48:30 PM
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UCREFRP
UCREFRP Catalog Number
9595
Author
CRCT Task Force.
Title
Conservation Agreement and Strategy for Colorado River Cutthroat Trout (Oncorhynchus clarki pleuriticus) in the States of Colorado, Utah, and Wyoming.
USFW Year
1999.
USFW - Doc Type
Fort Collins, CO.
Copyright Material
NO
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<br />Wyoming has implemented a number of on-going watershed projects (e.g. Little Mountain, Labarge) <br />that focus on entire systems and pennit reconnection of stream populations to enhance <br />metapopulations. Colorado has directed through policy that native cutthroat and their habitat shall <br />be protected from stocking of non-native salmonids and whirling disease. Utah has established a <br />statewide stocking policy which directs that stocking for sportfishing recreation will be consistent <br />with native cutthroat trout conservation programs, goals, and objectives. <br /> <br />Existing headwater habitats that already support wild trout populations are being converted <br />to native trout habitat. Colorado River cutthroat trout reclamation projects started within Rocky <br />Mountain National Park in 1979, and other projects are being completed through reclamation <br />projects funded by GO Colorado Legacy grants (Yampa River) and CUP mitigation grants <br />(Colorado River). Federal land management agencies (FS and BLM) are signatory participants with <br />responsibilities for habitat enhancement in Utah's conservation agreement and strategy for Colorado <br />River cutthroat trout. <br /> <br />B. Overutilization of the species for commercial. recreational. scientific or educational <br />purposes: <br /> <br />Overharvest due to unrestricted angling may pose a threat to populations of this subspecies <br />(Young 1995). Quinlan (1980) and Eiserman (1958) report instances wherein Colorado River <br />cutthroat trout demonstrated an ease of capture by anglers that could be translated into vulnerability <br />to overharvest. Overharvest is not considered a problem. Special regulations specifying catch-and- <br />release, very limited harvest, and terminal tackle restrictions have demonstrated effectiveness in <br />maintaining trout populations in the face of a wide range of fishing pressure, and have been applied <br />as standard to native cutthroat waters in all three states. Location of CRCT populations in remote <br />headwater drainages and small streams with difficult access has had an isolating, protective effect <br />from fishing pressure. The tendency for these populations to be composed largely of small-sized <br />fish has also served to protect these populations from angling pressure. Wyoming has closed some <br />cutthroat waters to fishing to prevent excessive angler harvest. The National Park Service has closed <br />four waters to fishing to protect broodstocks, small populations, and spawning fish. The Colorado <br />Division of Wildlife is considering expanding the use of closures to protect important conservation <br />populations of native cutthroat trout (Krieger et ale 1998). Monitoring of wild native cutthroat trout <br />populations that support fisheries is a continuous process in all three states. <br /> <br />C. Disease or predation: <br /> <br />Cutthroat trout are susceptible to common salmonid diseases, including whirling disease <br />(WD). WD is caused by the myxosporeanMyxobolus cerebralis (Markiw 1992). Colorado River <br />cutthroat trout exposed to M cerebralis in the wild in sentinel fish experiments suffered <br />significantly greater mortality from the infection than most other non-native salmonids (Nehring <br />1998). Very little is known about other diseases and parasites of this subspecies. Young (1995) <br />found that cutthroat may not avoid predators as well as some other salmonids. <br /> <br />Transmission of diseases to wild cutthroat populations through hatchery-based fish stocking is <br /> <br />March 1999 <br /> <br />16 <br />
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