Laserfiche WebLink
<br />Study #6. Anal vsis of Dast collections from the Green River for the <br />Dresence of razorback sucker and humDback chub. <br /> <br />DescriDtion of work <br />This study is related to several null hypotheses stated in the overall <br />Fl ami ng Gorge Research Program, especi ally those concerned with <br />reproduction and recruitment of razorback sucker and humpback chub. Data <br />collected in this study will be particularly valuable for documenting past <br />reproductive/recruitment success of razorback sucker and humpback chub in <br />the Green River. The primary objective of the study iS,to identify young <br />razorback sucker and humpback chub in past collections of young fishes <br />from the Green River system by applying recently acquired diagnostic <br />characters. Before development of these diagnostic characters, identity <br />of field collected and laboratory processed young razorback sucker or <br />humpback chub was listed as tentative or often unknown. In this study <br />when young razorback sucker or humpback chub are identified, capture <br />information and information relating to the yearly hydrograph will be <br />synthesized to prOVide a picture of conditions which may have spawned the <br />fish. By doing this it is hoped that a clearer picture will emerge as to <br />the past reproductive/recruitment success and environmental requisites of <br />these fish. <br /> <br />Methods <br />Selected existing collections of young fish from the Green River system <br />along with relevant capture information for each sample will be located <br />and obtained. Candidate samples of suckers and Gila will be selected for <br />thorough taxonomic analyses utilizing procedures and diagnostics developed <br />by the lFl. If young razorback sucker or humpback chub are identified, <br />specimen and capture data will be synthesized and related to information <br />on annual and seasonal environmental conditions <br /> <br />Rationale <br />Adverse effects of sampling on endangered fishes in the Upper Colorado <br />River basin has been identified as an area of concern within the Recovery <br />Implementation Program. This study is an excellent way to reduce required <br />sampling and make maximum use of information and samples already <br />available. <br /> <br />Deliverables <br />Work will be completed and a final report submitted by September 1993. <br /> <br />1993 BudGet <br /> <br />labor <br /> <br />$5,000 <br />~5.000 <br /> <br />Total <br /> <br />Flaming Gorge Studies <br /> <br />25 <br />