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Last modified
7/14/2009 5:02:31 PM
Creation date
5/20/2009 10:09:57 AM
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UCREFRP
UCREFRP Catalog Number
7875
Author
Burdick, B. D., R. S. Wydoski and C. W. McAda.
Title
Stocking Plan For Razorback Sucker In The Upper Colorado And Gunnison Rivers.
USFW Year
1995.
USFW - Doc Type
\
Copyright Material
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<br />upstream of Government Highline Diversion Dam (Anderson 1994). Northern <br />pike (Esox lucius), red shiner (Cyprinella lutrensis), and sand shiner <br />(Notropis stramineus) have not been identified upstream of Government <br />Highline Dam on the Colorado River (Anderson 1994). Only 20 adult <br />northern pike were caught upstream of Redlands Diversion Dam in 1992 and <br />1993 during an intensive inventory of the Gunnison River fish community <br />(Burdick 1995). Unfortunately, fathead minnows (Pimephales promelas), <br />red shiner and sand shiners are prevalent in the Gunnison River (Burdick <br />1995); however, stocked razorbacks should be large enough to overcome <br />any predation or competition from these species. <br />These two areas are the upstream reaches of historic habitat for <br />razorback sucker. Because the young fish are expected to move <br />downstream, they will undoubtedly populate downstream reaches as well. <br />By stocking the fish at the upper limits of its range, we can expect to <br />eventually populate the entire river system. Also, the young fish will <br />be able to select low-velocity habitats that they encounter in the <br />broad, floodplain valleys downstream from the release points before <br />being carried into canyons where quiet-water habitat is limited. The <br />specific release points are: Gunnison River - a three-mile reach <br />downstream from Hartland Diversion; and Colorado River - a five-mile <br />reach beginning near Rifle, Colorado. <br />Limited numbers of fish available for stocking in early periods of this <br />study require prioritization between the two stocking sites. The <br />Gunnison River should have priority over the Colorado River for several <br />reasons: (1) Interim flow recommendations made for studies related to <br />the Aspinall Biological Opinion should benefit the species; (2) Removal <br />of non-native predators from the Gunnison River is ongoing and intended <br />to directly benefit survival of'young razorback suckers; (3) The river <br />is smaller than the Colorado River, which should mean that fewer fish <br />are needed and, secondarily, the area to be monitored is smaller; (4) <br />Fish will still be able to move downstream and populate the Colorado <br />River; (5) Fish passage will soon be constructed at the Redlands <br />Diversion which will allow fish to move back upstream if desired; and <br />(6) Field studies at the confluence of the Gunnison and Uncompahgre <br />rivers are an important component of the proposed chemoreception <br />studies. <br />6. Time of Release <br />The fish will be stocked in either August or September. The intent is <br />to release the fish with sufficient time to acclimate to the riverine <br />environment before water temperatures decrease in late fall and winter. <br />This period is the earliest that YOY fish could be released after being <br />produced the previous spring. Also, streamflows are lowest at that time <br />of year so fish reared in ponds or floodplain habitats will not be <br />immediately subjected to high spring flows and should become physically <br />conditioned for life in the river prior to high flows the following <br />spring. <br />Timing may be varied for different groups to allow increased growth in <br />the hatchery and therefore allow comparison among size groups. Also, <br />9
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