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Last modified
7/14/2009 5:02:29 PM
Creation date
5/20/2009 10:06:44 AM
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UCREFRP
UCREFRP Catalog Number
7203
Author
Osmundson, D. B. and L. R. Kaeding.
Title
Colorado Squawfish and Razorback Sucker Grow-Out Pond Studies as Part of Conservation Measures for the Green Mountain and Ruedi Reservoir Water Sales
USFW Year
1989.
USFW - Doc Type
Final Report.
Copyright Material
NO
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1 <br />i <br />t <br />1 <br />1 <br />i <br />1 <br />t <br />1 <br />1 <br /> <br />t <br />t <br />u <br />1 <br />1 <br />1 <br /> <br />Rado golf course in Grand Junction. This pond was chosen because it was <br />secure from unauthorized access and it could be easily seined. Each week <br />we seined the squawfish from the pond, weighed them and made observations <br />on the external signs of their reproductive development. When the pond <br />temperatures rose to 20 C and the males were producing milt that could be <br />easily expressed when external pressure was applied, we anticipated that <br />the female fish too would be in near-ripe condition. We injected the <br />females with an extract of carp pituitary on 14-15 July to induce ovula- <br />tion. <br />As later discussed in Results, captive female brood fish failed to fully <br />ripen in the pond; thus we were unable to obtain eggs from wild fish <br />during this initial attempt. In fall 1986 we made another attempt at <br />holding wild squawfish for use as brood stock, this time in a controlled <br />environment. Six adult squawfish were captured from the White River <br />downstream from Kenney Reservoir by Colorado Division of Wildlife person- <br />nel, and were transported to Hotchkiss National Fish Hatchery (NFH). They <br />were held there in three enclosed, circular tanks and fed young rainbow <br />trout. <br />Because we were unable to obtain fry from captive squawfish in summer <br />1986, we stocked hatchery-produced young in the rearing ponds that we had <br />prepared. These were hatched at Dexter NFH in June 1986 and reared at <br />Willow Beach NFH. On 28 August, the squawfish were transported from <br />Willow Beach to the ponds in a distribution tank equipped with bottled <br />oxygen and a water circulation system. Tank temperature was 16 C upon <br />arrival, so pond water (24 C) was added until the tank temperature reached <br />21 C. Approximately 7,000 squawfish (28-61 mm long) were stocked into <br />4
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