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<br />below, nonnative fish removal will continue to be done on all adult monitoring trips. The study design for adult <br />monitoring is based upon the criteria for long-term monitoring of the San Juan River main channel fish <br />conununity. These criteria were accepted as final by the San Juan River Biology Conunittee on 3l March <br />2000. <br /> <br />Descriotion of Study Area: <br /> <br />The study area for adult monitoring extends from river mile (RM) 180.0 (Animas River confluence) in <br />Farmington, New Mexico, downstream to RM 2.9 (Clay Hills Landing) just above Lake Powell in Utah. The <br />entire reach of river from RM 180.0 to RM 2.9 will be sampled in the fall of every year (sampling to begin in <br />the second to third week of September). <br /> <br />Obiectives: <br /> <br />I. Determine shifts in fish community structure, abundance and distribution, and length/weight frequencies <br />under the reoperation flow regime. <br /> <br />2. Monitor Colorado pikeminnow population trends (spawning and staging areas, habitat needs). <br /> <br />3, Monitor experimentally stocked razorback sucker and Colorado pikeminnow (growth rates, dispersal <br />patterns and habitat use). <br /> <br />4. Remove nonnative fish species which prey upon and compete with native fish species in the San Juan <br />River. <br /> <br />5, Produce an interim progress report for results and findings of 2000 adult monitoring field work. <br /> <br />Methods: <br /> <br />Objectives 1-5: One adult monitoring trip will take place in fall 2001. The fall trip will sample from the <br />Animas River confluence in New Mexico (RM 180.0) to Clay Hills Landing in Utah (RM 2.9). E1ectrofishing <br />will be the primary sampling technique, although seining and trammel netting may also be employed. <br /> <br />Two oar-powered rafts, with one netter each, will electro fish in a continuous downstream fashion, with one raft <br />on each far shoreline. No outboard motors will be used. Sampling crews will consist of approximately 8-9 <br />people (4 for electrofishing, 2 for baggage rafts, and 2-3 for other research elements that are being done <br />simultaneously with our sampling), Electrofishing will be conducted in a continuous downstrcam fashion, <br />sampling two out of every three miles (approximately 120 total sampled miles). All fish collected will be <br />enumerated by species and life stage every sampled mile. Every fifth sampled mile (designated mile), all fish <br />collected will be weighed, measured, and sexed if possible. All native fish collected will be returned alive to <br />the river. All nonnative fish collected will be removed from the river. All predatory lacustrine fishes (i.e. - <br />walleye, striped bass, largemouth bass, small mouth bass, etc.) collected will be weighed, measured, and have <br />stomach contents taken, before being removed from the river. Tag numbers, total length, and weight will be <br />recorded on all recaptured, FLOY -tagged fish (both native and nonnative), as well as any rare fish collected. <br />Colorado pikeminnow and wild razorback sucker greater than 200 mm TL will be implanted with PIT (Passive <br /> <br />3 <br /> <br />I <br />I <br />1 <br />\ I <br /> <br />I <br />I <br />! <br />I ' <br />) <br />