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Last modified
7/14/2009 5:02:29 PM
Creation date
5/22/2009 4:39:52 PM
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UCREFRP
UCREFRP Catalog Number
7152
Author
Holden, P. B.
Title
Relationship between Flows in the Yampa River and Success of Rare Fish Populations in the Green River System.
USFW Year
1980.
USFW - Doc Type
Logan, Utah.
Copyright Material
NO
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<br />3 <br /> <br />were made from 1977-1979, and Vanicek's (1967) data from Dinosaur <br />National Monument, collected in 1964-1966. These data represent the <br />results of the only studies where information on reproductive success <br />is available for at least a 5-year period. Information from other <br />short-term studies are included to support or reject the conclusions <br />drawn from these two base studies. Figure 1 is a map of the upper <br />Green River system showing localities mentioned in the text. <br />Vanicek (1967) showed that young squawfish could be aged quite <br />readily by length/frequency analysis, especially for the first 3 years <br />of life. Older fish were more difficult to age. Therefore, this <br />study concentrated on the first 3 or 4 age groups, young-of-the-year <br />(age group 0), yearlings (age group I), two year olds (age group II), <br />etc. Squawfish usually spawn in July or early August in the upper <br />Green River (Vanicek and Kramer 1969; Holden and Stalnaker 1975), <br />therefore Age 0 fish are found in August-December of a given year, <br />Age I during the next year, and so on. Successful reproduction in an <br />area was determined by the number of young squawfish caught where <br />sufficient effort was expended to ascertain their presence. Sufficient <br />effort was defined as sufficient seine hauls in the habitats most <br />likely to produce young squawfish. Young-of-the-year squawfish are <br />readily caught with seines in Au~ust, September, and October. <br />Yearling squawfish are most readily cau9ht in May and June but are found <br />throughout the year, as are age II fish. Age II fish are caught less <br />frequently than either ages 0 or I, which is as expected due to juve- <br />nile mortality and perhaps changes in preferred habitat. This approach, <br />
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