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7/14/2009 5:02:28 PM
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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
NO
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<br />I bass when offered three size ranges of squawfish (50-65 mm, <br /> 75-90 mm, and 100-120 mm long). <br /> Pond bass switched their diet from customary food <br /> items to squawfish after squawfish were stocked. Captive <br /> bass preferred squawfish over green sunfish and red shiners <br />¦ b <br />t <br /> u <br />selected fathead minnows and squawfish equally. Under <br /> pond conditions, however, fathead minnows failed to buffer <br /> predation on squawfish, indicating that stocked squawfish <br /> were more vulnerable. Bass ate significantly higher <br /> numbers of the smallest squawfish available under labora- <br /> t <br />di <br />i <br /> ory con <br />t <br />ons and during the first three nights after <br /> pond stocking. Squawfish survival varied greatly among <br /> ponds and stocking efforts. Survival was 0-60% 30 wk after <br /> stocking in fall 1983, 0-49% 10 wk after the summer 1984 <br /> stocking, and 0.0-0.3% 28 wk after the fall 1984 stocking. <br /> <br /> Stomach contents of bass indicated that intense predation <br />was largely responsible for the complete loss of squawfish <br />from one pond which had a high bass density. However, <br />mortality was also high in a pond with few predators; <br />starvation, winter stress, or parasitism might explain the <br />low survival there. The rate of growth of squawfish in one <br />pond where water was warm and forage plentiful, was more <br />than twice that previously documented for squawfish from <br />river or hatchery environments. Thus, riverside ponds <br />appear to have potential as low-maintenance grow-out ponds <br />for hatchery-produced squawfish if predators are absent and <br />self-sustaining forage fish are present. <br />xiv
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