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Last modified
7/14/2009 5:02:28 PM
Creation date
5/20/2009 10:05:04 AM
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UCREFRP
UCREFRP Catalog Number
3201
Author
Osmundson, D. B.
Title
Growth and Survival of Colorado Squawfish (Ptychocheilus lucius) Stocked in Riverside Ponds, With Reference To Largemouth Bass (Micropterus salmoides) Predation
USFW Year
1986
USFW - Doc Type
\
Copyright Material
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<br />1 <br />I ABSTRACT <br /> Colorado squawfish (Pt ychocheilus lucius) of the upper <br /> Colorado River are thought to experience a high rate of <br /> mortality during the first few years of life. Occurrence <br /> of the nonnative largemouth bass (Micropterus salmoides) in <br /> <br /> Colorado River backwaters, a preferred habitat of young-of- <br />the-year and juvenile squawfish, may be an important factor <br />affecting squawfish survival. Largemouth bass food habits <br />were studied in riverside ponds and in the laboratory to <br />determine squawfish vulnerability to bass predation. Also, <br />the potential usefulness of riverside ponds for squawfish <br /> culture was investigated. <br /> Hatchery-reared Colorado squawfish (45-145 mm long) <br /> were stocked at 3,090 fish/ha in five gravel-pit ponds <br /> (0.85-3.16 ha) adjacent to the Colorado River in the fall <br /> of 1983 and 1984, and in the summer of 1984. Resident <br /> largemouth bass and several species of forage fish varied <br /> in relative abundance among ponds. Growth and survival of <br /> stocked squawfish were monitored as were bass stomach con- <br /> tents before and after squawfish stocking. Three labora- <br /> tory experiments were conducted to determine the preference <br /> of largemouth bass when offered Colorado squawfish and one <br /> f <br /> o <br />three alternative prey types: (1) fathead minnows (Pime- <br /> hales promelas), (2) red shiners (Notropis lutrensis), and <br /> (3) green sunfish (Lepomis cyanellus). Another laboratory <br /> experiment tested the prey-size preference of largemouth <br /> <br /> X111
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