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Last modified
7/14/2009 5:02:33 PM
Creation date
5/22/2009 4:52:15 PM
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UCREFRP
UCREFRP Catalog Number
8114
Author
Nesler, T. P.
Title
Five-year Stocking Plan for Endangered Colorado River Fish Species in Colorado.
USFW Year
1998.
USFW - Doc Type
Denver, CO.
Copyright Material
NO
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<br />Stocking Plan Summary <br /> <br />The stocking plan is presented for each species by river reach, and by fish size and <br />season in which stocking will occur over a five year period. Numbers of fish required via <br />propagation are presented in Tables 1-3 for each species and river reach described by fish <br />size and year stocked. It is proposed that restoration stocking is desirable for three of the <br />endangered Colorado River fishes (listed in priority): razorback sucker, bonytail, and <br />Colorado pikeminnow. Table 4 provides the survivorship curves used to back-calculate from <br />the target numbers proposed as an objective for each species to determine numbers of fish <br />needed at each age/size. These survival rates and fish sizes were estimated in Wydoski <br />(1996) for a hatchery environment, and therefore, may underestimate numbers of fish needed <br />to meet stocking objective endpoints. The goal of stocking for each species is the <br />establishment of a multiple-age group population of a desired abundance level (fish/mile). <br />Stocking would be conducted over the five-year period as shown in order to meet these <br />criteria, but would be modified by numbers stocked, size, season, or location based on <br />monitoring results. An evaluation of the monitoring data following the completion of the <br />stocking should be accomplished to integrate the annual results. <br /> <br />This stocking plan will require the propagation of fish over a 6-year period for <br />razorback sucker and bonytail, and a seven-year period for Coloradopikeminnow. For <br />razorback sucker, stocking is proposed for two reaches of the Colorado River from Rifle to <br />Debeque and Palisade to Stateline, and in the Gunnison River from Hartland Dam to <br />Redlands Dam. Within Wydoski (1995), these three reaches are all included within the <br />range of one genetic population of razorback sucker for the Upper Colorado River subbasin. <br />For Colorado pikeminnow, stocking is proposed in three rivers-the Colorado River from <br />Rifle to Debeque, the Gunnison River from Hartland Dam to Red1ands Dam, and in the <br />Dolores River from Disappointment Creek confluence to Stateline. The Colorado and <br />Gunnison river reaches are included together as part of the range for one genetic population <br />of Colorado pikeminnow in the Upper Colorado River subbasin (Wydoski 1995). The <br />Dolores River is not specifically mentioned within the Recovery Program Genetics <br />Management Plan since it is presently considered unoccupied habitat for adult Colorado <br />pikeminnow, but conceptually this river should be included within the Upper Colorado River <br />subbasin since it is a tributary to the Colorado River that confluences below Westwater <br />Canyon in eastern Utah. Bonytail is proposed for stocking in the Yampa River in Dinosaur <br />National Monument and in the Colorado River within the Grand Valley reach. Due to this <br />species extirpation in the wild, the Recovery Program Genetics Management Plan identifies <br />only one captive genetic stock, from which all restored populations must be derived. <br /> <br />For all three of these species, the stocking of different sizes of fish in two seasons is <br />proposed to evaluate the relation between size of fish released and season stocked with <br />survival, and determine the most effective combination for subsequent propagation and <br />stocking plans. The approach described here is to stock two sizes of each species for three <br />years in both the fall and spring seasons in each target river reach. The only exception to <br /> <br />4 <br />
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