Laserfiche WebLink
<br />. <br /> <br />. <br /> <br />, <br /> <br />Trout Soawnino <br /> <br />Objectives: <br />Determine trout spawning grounds and redd survivorship <br />at 5000 cfs. <br /> <br />Justification: <br />Trout fishing in the upper reach is of economic <br />importance to Arizona. The ability of the trout <br />population to maintain itself rather than be <br />continually stocked is an important consideration in <br />management of this reach. Certain minimum flows may <br />allow for sufficient trout spawning and survival to <br />permit reduction in stocking. The availability of <br />spawning grounds and survival of redds at low flows is <br />not well known. Measurement of functional spawning <br />areas and estimates of survivability of redds at 5000 <br />cfs will greatly enhance the information on maintenance <br />of the Glen Canyon trout population. <br /> <br />Methods: <br />At 5000 cfs, map the boundaries of spawning areas at <br />three selected spawning bars. Selection of the bars may <br />require a reconnaissance trip prior to the constant <br />flow period or meetings with river guides. <br /> <br />At 5000 cfs, evaluate survival of redds (if present) at <br />the selected spawning bars. ' <br /> <br />Using substrate mapping and aerial photos (198~ and <br />1989) extrapolate spaw~ng areas and redds survival to <br />full upper 16 mile reac~. <br /> <br />Requirements: <br />Boats and personnel to work the selected bars and <br />possibly for reconnaissance ~ip. <br /> <br />- <br /> <br />>> <br /> <br />9 <br />