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Last modified
7/14/2009 5:02:35 PM
Creation date
5/22/2009 12:30:34 PM
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UCREFRP
UCREFRP Catalog Number
9368
Author
Gustaveson, W. A.
Title
Cyclical Population Dynamics of Self-sustaining Striped Bass in Lake Powell, Utah-Arizona, 1974-1998.
USFW Year
1999.
USFW - Doc Type
Salt Lake City.
Copyright Material
NO
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<br />natural reproduction. It appeared that a precarious balance <br />occurred between striped bass predation and shad abundance <br />beginning with the shad peak in 1991. The single shad peak year <br />of 1991 did not result in survival of an excessively large number <br />of juvenile striped bass since most adult fish did not attain <br />spawning condition. Conversely, two years of improved forage <br />conditions (1995-1996) resulted in high recruitment of 1996 year- <br />class striped bass. <br />Young-of-year population abundance was measured by annual <br />electrofishing sampling each September and gill netting each <br />November (Figure 3). The schooling, pelagic nature of striped <br />bass makes any sampling scheme vulnerable to misrepresentation <br />depending on the behavior of striped bass during the sampling <br />period. Peaks in abundance measured by one survey have not <br />necessarily been corroborated by other surveys in the same year. <br />The 1991 peak capture of yoy in gill nets resulted from 2 nets of <br />10 total set at one downlake location where yoy were abundant. <br />The 38 other nets included in that survey captured only a few yoy <br />while two nets caught over 100 yoy each day. The result was a <br />yoy peak in 1991 even when averaged over the entire survey. <br />Spawning production in 1996 measured by electrofishing found <br />record high numbers of yoy striped bass at all locations with the <br />exception of Warm Creek, the station closest to the dam. When <br />compared to yoy captured during fall netting a corresponding peak <br />is seen. In some years a spike in yoy numbers is seen in one <br />surveyor the other without corroboration from the other survey. <br />The strength of the 1996 year-class was depicted by the <br />results of both surveys. Young-of-year striped bass caught <br />electrofishing was at the highest level ever recorded. Gill net <br />catch of yoy was also near record proportions. Based on both <br />surveys, the 1996 striped bass year-class was present at all <br />locations in numbers never before seen in over 20 years of <br />sampling (Figure 3). <br />The 1996 year-class was extremely numerous as yearlings in <br />1997 based on creel survey reports but not remarkable when <br /> <br />23 <br />
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