Laserfiche WebLink
<br />13~O <br /> <br />pikeminnow were radio-tagged. In addition, 10 adult and 43 juvenile, experimentally-stocked <br />Colorado pikeminnow have been recaptured. Twenty-two roundtail chub were collected, 18 of <br />these were PIT -tagged. No wild razorback sucker were collected, however 62 of 68 recaptured, <br />stocked razorback sucker have been recaptured during adult monitoring. FLOY-tagged native <br />suckers have yielded data about the movement of these species in relation to four instream <br />diversion structures in the area of Farmington, New Mexico. <br /> <br />, ' '~ <br /> <br />The need for a long-term, standardized monitoring program, such as the adult monitoring study <br />is addressed in objective 5.7.1, a Milestone in the San Juan River Long Range Plan. <br />Additionally, future monitoring will help determine fish community response to reoperation <br />flows from Navajo Dam (objective 5.2.10), as well as monitoring both wild and augmented <br />populations of Colorado pikeminnow and razorback sucker (objective 5.3.9). Further <br />monitoring of experimentally-stocked, adult Colorado pikeminnow and FLOY-tagged native <br />suckers will help address objective 5.2.9, specifically 5.2.9.1 by examinig the movements of <br />these fish in relation to the diversion structures near Farmington, New Mexico. <br /> <br />r;i <br />i-"~ <br />~-,. 1 <br /> <br />Adult monitoring will continue with one trip in fall 1999, to measure fish community response <br />to reoperation flows from Navajo Dam, monitor populations of experimentally-stocked Colorado <br />pikeminnow and razorback sucker, and assess impacts of instream diversion structures to native <br />fish species. In support of objective #5 below, nonnative fish removal will continue to be done <br />on all adult monitoring trips. In support of objective #4 data collected from recaptured, FLOY- <br />tagged fish collected in the Farmington to Hogback Diversion (New Mexico) reach will continue <br />to be examined to evaluate the impact of instream diversion structures in this reach of river on <br />the movement of native fish species. The study design for adult monitoring is based upon the <br />latest draft criteria for long-term monitoring of the San Juan River main channel fish <br />community. These criteria are currently being finalized by the San Juan River Biology <br />Committee. <br /> <br />Obiectives: <br /> <br />1.) Determine shifts in fish community structure, abundance and distribution, and <br />length/weight frequencies under the reoperation flow regime. <br /> <br />2.) Monitor Colorado pikeminnow population trends (spawning and staging areas, <br />habitat needs). <br /> <br />3.) <br /> <br />Monitor experimentally stocked razorback sucker and Colorado pikeminnow <br />(growth rates, dispersal patterns and habitat use). <br /> <br />~',i <br />Li <br /> <br />4.) <br /> <br />Continue evaluation of movement data and rare fish distribution to determine the <br />extent to which current structures (dams, weirs, etc.) may impeding endangered <br />fish movement. <br /> <br />,'.' <br />'3'; <br />~i' <br /> <br />Work Plan FY99.wpd <br /> <br />2 <br /> <br />Budget and Work Plan FY99 <br /> <br />Wt~ <br />r <br /> <br />Ii <br />Iii <br />