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Last modified
7/14/2009 5:02:32 PM
Creation date
5/24/2009 7:32:18 AM
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UCREFRP
UCREFRP Catalog Number
8026
Author
Berry, C., R. Bulkley, D. Osmundson and V. Rosen.
Title
Survival of Stocked Colorado Squawfish with Reference to Largemouth Bass Predation.
USFW Year
1985.
USFW - Doc Type
Logan, Utah.
Copyright Material
NO
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2) Determine the effect of size at stocking on susceptability to <br />predation and/or overall mortality. <br />3) Determine if the presence of other forage fish serve as a buffer <br />to predation on squawfish, and if so, which species. <br />4) Determine whether time (season) of stocking influences the rate <br />of squawfish survival. <br />5) Determine the rate of growth of young squawfish while confined <br />in gravel pit ponds. <br />6) Characterize certain biotic and abiotic features of flooded <br />gravel pits in relation to their potential use as rearing ponds. <br />METHODS <br />A detailed outline of methods as well as a more thorough introduction <br />can be found in the formal study proposal included in the Appendix. To <br />fully understand the scope of the project, the reader is encouraged to <br />study the proposal before proceeding with the update of the results. <br />Eight major activities have been or are being conducted to accomplish <br />the stated objectives. These are: <br />1) To select five study ponds based on differences in resident <br />fish community composition and certain physical characteristics. <br />2) To quantify bass populations and alternate forage species <br />present in the ponds. <br />3) To monitor basic limnological features of the ponds. <br />4) To stock 50-150 mm long squawfish into the ponds three <br />different times at a rate of 1250 fish per surface acre. <br />5) To monitor bass food habits through collections of stomach <br />contents before and after squawfish stocking. <br />6) To monitor growth of squawfish while confined in the ponds. <br />7) To remove remaining squawfish by-seining after a given time <br />period for estimating overall survival in the different ponds. <br />8) To conduct controlled laboratory bass feeding studies to <br />determine if bass display a preference for a,certain size <br />of squawfish and whether they prefer squawfish over three other <br />commonly eaten forage fish. <br />RESULTS AND DISCUSSION <br />1. Study Ponds <br />Forty-three ponds were identified as possible-study sites. After visual <br />2
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