WSP11633 - Laserfiche WebLink

Home Browse Search

.' ENCLOSURE 3 "~ : KEY DISCUSSION POINTS FLIP CHART NOTES . ENDANGERED FISH MEETING, MARCH 14, 1994 , ( A. DEFINITION OF JEOPARDY BiojWest = mainstem adult demographics and movement Arizona Game & Fish = mainstem and Little Colorado River young fish movement Arizona state University = Adult demographics in the Little Colorado River Fish & Wildlife Service = characterization in the Little tributaries in the Grand Canyon B. Jeopardy = prevents likelihood of continual existence of the species Reasonable and Prudent Alternative: 1. Implemented consistent with intended purpose of the agency action 2. Implemented wi thin the scope of the agency's legal authority 3. Is economically and technically feasible 4. Will avoid the likelihood of jeopardizing the listed species ,-, ',,, ~.: '.(; ~:- PRIMARY AREAS OF GCES ENDANGERED SPECIES STUDIES 7" , ~, .. ,.- Humpback Colorado habitat and in ;", chub River Summary of the Meeting (enclosure 1) Summary of the Drivers and Processes (enclosure 2) .. Key points: a. Flooding: A flood of three orders of magnitude is required to displace the native fish. Consistent with Southwest streams. The flood of 1983 (91,000 cfs) did not remove the non-native fish. b. Adult HBC are very resilient and can handle wide range of flow and temperature. c. Key problem is recruitment of the young fish into the population d. Temperature is the primary driving variable to the recruitment to the population e. Backwaters are tied to the thermal regime. Used as habitat for the young fish.' f. TUrbidi ty is used as cover by the fish. If the turbidity is not present, depth is used as a substitute by the HBC g. Adult HBC do not appear to be limited by food under the current flow regimes f1: , 'i-:._ C. REVIEW OF THE MARCH 2, 1994 MEETING 1. 2. 3. :'< <; ;.;.-~ ~~~ .', -:~: )'-.