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<br />1.??8 <br />--'-IoJ_ <br /> <br />,..<.-,- <br /> <br />San Juan River Larval.Razorback Sucker Survey <br />Fiscal Year 1999 Project Proposal <br /> <br />Principal Investigators: Steven P. Platania <br />Division of Fishes - Museum of Southwestern Biology, <br />University of New Mexico, Albuquerque, NM 87131 <br />(505) 277-6005 platania@unm.edu <br /> <br />and <br /> <br />Principal Investigators: David L. Propst <br />Conservation Services Program, New Mexico Department of Game and Fish, <br />State Capitol, Villagra Bldg, P.O. Box 25112, Santa Fe, NM 87504 <br />(505) 827-9906 (jlropst@state.nm.us <br /> <br />Study Area: <br /> <br />The principal sampling area for this study will be the San Juan River between RM 128 and <br />Mexican Hat (RM 53). If time and funds permit, we will attempt to make one sampling foray <br />in 1999 between Mexican Hat (RM 53) and the Clay Hills boat landing (RM 2.9) just above <br />Lake Powell in Utah. If conducted, this latter sampling effort would include making collections <br />in reaches of the San Juan River under the jurisdiction of the National Park Service. <br /> <br />Collections: <br /> <br />All fish specimens collected will be sorted, identified and preserved for curation in the Division <br />of Fishes, Museum of Southwestern Biology (MSB), Department of Biology, at the University <br />of New Mexico. <br /> <br />Backeround: <br /> <br />;". <br /> <br />In 1994, the first series of razorback sucker (n=672) were stocked in the San Juan River <br />between Bluff, Utah and the Hogback, New Mexico. Mean length and mass of those <br />individuals, at the time of stocking, was about 400 mm TL and 710 g, respectively. In 1995, <br />13 of the recaptured razorback sucker were tuberculate males and six of those individuals were <br />ripe. Four recaptured 1995 razorback sucker were determined to be female but, unlike the <br />males, none were sexually mature. In their 1995 report of activities, Ryden and Pfeifer (1996) <br />suggested that the majority of the experimentally stocked San Juan River razorback sucker <br />reached sexual maturity in 1995-96 and that spawning of these individuals might begin in the <br />next two years. <br /> <br />The UNM-NMGF larval fish drift study, whose primary focus was determining spawning <br />period, identifying approximate location of spawning sites, and assessing effects of annual <br /> <br />Work Plan FY99.wpd <br /> <br />10 <br /> <br />Budget and Work Plan FY99 <br />