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Last modified
8/11/2009 11:32:56 AM
Creation date
8/10/2009 3:39:59 PM
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UCREFRP
UCREFRP Catalog Number
7422
Author
Valdez, R. A. and W. J. Masslich.
Title
Winter Habitat Study of Endangered Fish - Green River.
USFW Year
1988.
USFW - Doc Type
Logan, Utah.
Copyright Material
NO
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<br />. <br /> <br />DRAFT <br /> <br />Movement <br /> <br />. <br /> <br />Northern pike movements observed during this investigation fit into the <br />three classifications outlined in the final report including, , no movement', <br />'local movement' and 'transitory movement'. Refer to the Movement section of <br />the final report for definitions of each movement pattern. <br /> <br />. <br /> <br />No Movement. Sedentary behavior by northern pike was rarely observed. <br />During only 2 observations did pike remain in one location long enough to take <br />measurements that were suitable for use with IFIM. <br /> <br />. <br /> <br />Local Movement. Observations on movements of northern pike generally fell <br />into this category. Most pike observed were very active. Generally the fishes <br />movements were confined to discrete low velocity habitats, such as slow eddies <br />or slackwate. Movements of up to 150 feet were observed on several occasions <br />where large slow water habitats existed. <br /> <br />. <br /> <br />Long-range Movement. Long range movements by northern pike are presented <br />in Table 2. Net and total movement figures do not include the distance from <br />the release point to the location of the first radio contact. Consequently, <br />since several of the fish were not located until the latter part of the winter, <br />total movement figures may not be indicative of some of the long range movement <br />displayed by these fish. The five pike that were contacted on more than one <br />occasion generally used a relatively small segment of river. However, pike <br />were rarely located in the same place on consecutive tracking trips, which <br />indicates that they actively move to various locations within a given reach of <br />river. Total movement of these five fish observed during the 1987-88 winter <br />averaged approximately 3 miles, with a range of 0.8 to 6.3 miles, while net <br />movement averaged approximately 1.3 miles with a range of 0.3 to 2.3 miles. <br /> <br />. <br /> <br />. <br /> <br />The three remaining pike were only contacted once after following <br />released. One fish (GR-6322), was located only once during the first tracking <br />trip, 4.5 miles below the point of release. The other 2 pike (GR-6320 and BL- <br />5161) were located on the last tracking trip in March at distances of 21.2 and <br />27.6 miles, respectively, downstream of their release points. One fish, (GR- <br />6320), was presumed dead or separated from it's transmitter. The other pike, <br />Floy tag #BL- 5161, appeared to be ali ve and behaving no rmall y . Movemen t <br />exhibited by this fish indicate that pike will move long distances during the <br />winter months, however since this fish was only contacted once after it was <br />released, it is not known if this movement occurred immediately upon release or <br />was a gradual movement downriver throughout the winter. <br /> <br />. <br /> <br />General Habitat Use <br /> <br />. <br /> <br />A total of 26 observations were made on pike during the 87-88 winter <br />including 13 in slow runs,S in eddies, 1 in slackwater, 1 in an embayment and <br />6 in unidentified ice covered habitats. A total of 195 minutes were spent <br />doing extended monitoring during 8 of the observations, including 100 minutes <br />in slow runs and 95 minutes in eddies. The remaining 18 observations included <br />just locations and habitat identification. <br /> <br />. <br /> <br />49 <br /> <br />. <br />
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