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<br />" <br /> <br />4. STUDIES PLANNED FOR FY93 <br /> <br />This section contains the package of research studies proposed for the <br />Flaming Gorge Research Program for FY 93. Studies that are ongoing or that will <br />be initiated during FY93 are brieflY sunvnarized. Studies are organized according <br />to the three major program components (areas of effort) presented previously. <br />A detailed Scope of Work for each study, submitted by the lead agency responsible <br />for conducting that task, can be found in Attachment A. <br /> <br />4.1 Core-Research Studies <br /> <br />StudY #1: Annual assessment of Colorado souawfish reproduction and larval <br />abundance in the lower Yampa River. Colorado. and the lower Green River. <br />Utah <br /> <br />Description of Work <br />This study is ongoing. LFL and UDWR will document timing and <br />duration of spawning by Colorado squawfish as measured by capture of <br />drifting larvae. Specific objectives of the study include <br />detenni nat i on of peaks in abundance of dri ft i ng 1 arvae and the <br />relative abundance of larvae transported from two spawning locations <br />and into downstream nursery areas. <br /> <br />Methods <br />Reproduction will be assessed using drift-net sampling at two sites: <br />one in the Yampa River immediately upstream of the Green-Yampa River <br />confluence (covers Colorado squawfish produced in the Yampa River; <br />site used in past sampling) and another in the Green River below the <br />Colorado squawfish spawning area in Desolation/Gray canyons. <br />Shoreline drift-net sampling (using flow-metered nets) will be <br />conducted daily at dawn during late June-early August. Samples will <br />.be preserved in ethanol to allow for subsequent ageing using <br />. otoliths so that spawning times can be determined. <br /> <br />- <br />Rationale <br />This study is critical for documenting annual reproduction of <br />Co 1 orado squawfi sh and other fi shes so that vari ous hypotheses <br />regarding effects of modified releases from FGD can be evaluated. <br /> <br />Deliverables <br />UDWR will provide sorted and preserved drift-net samples from the <br />lower Green River collections to LFL. LFL will sort and preserve <br />drift-net samples from the Yampa River collections. All samples <br />will be ident.jfied, verified, and curated by LFL personnel. A <br />summary report will be submitted at the end of the fiscal year. <br /> <br />Flaming Gorge Studies <br /> <br />20 <br />