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2013-03-06_REVISION - C1992081 (6)
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2013-03-06_REVISION - C1992081 (6)
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Entry Properties
Last modified
8/24/2016 5:14:34 PM
Creation date
3/7/2013 3:01:57 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1992081
IBM Index Class Name
Revision
Doc Date
3/6/2013
Doc Name
Completeness Letter & Attachments
From
DRMS
To
OSM
Type & Sequence
TR10
Email Name
JLE
SB1
Media Type
D
Archive
No
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r � � <br />8 <br />in and around the Grand Valley, provide the best indication of use of the <br />15 -mile reach above the confluence of the Gunnison River at one time or <br />another during the field season. Movement of these fish during a field season <br />was generally limited to 25 -30 miles. <br />During 1986, the Fishery Project radio - telemetered three adult Colorado <br />squawfish collected from the 15 -mile reach above the Gunnison River in June <br />(Kaeding and Osmundson 1987). The fish exhibited a diversity of localized <br />movement but spent a major part of the next 6 months in the reach upstream of <br />the Gunnison River. Two remained in the reach throughout the estimated <br />spawning period. <br />Spawning Activity <br />A suspected prespawning aggregation of adult Colorado squawfish was observed <br />by Fishery Project personnel at river mile 178.3 in the 15 -mile reach above <br />the Gunnison River confluence in mid -July 1982. In the first observation, <br />three radio - tagged fish were tracked to one riverine pool area, and nine <br />adults at or near spawning condition were handled after limited net sampling <br />efforts. The aggregation occurred a few days after mean daily water <br />temperature had reached 20 °C and during a time when runoff flows were <br />dropping off sharply. A second aggregation was noted at river mile 175.3, <br />12 days after the initial observation. Drifting trammel nets through an area <br />occupied by two fish equipped with transmitters yielded an additional male <br />Colorado squawfish in spawning condition. During this same time period, an <br />adult female was captured near river mile 175 that weighed nearly I pound more <br />than when previously captured a month earlier, suggesting the development of <br />spawning (gravid) condition. <br />Larval Occurrence <br />Fishery Project studies included the routine sampling of the larval -fish <br />community both within and downstream of the 15 -mile reach. During 5 years <br />of investigation, 46 larval squawfish were collected with fine -mesh hand <br />nets from two 15 --mile reaches of the Colorado River immediately upstream <br />and downstream of its confluence with the Gunnison River. Although the <br />sampling effort was similar in the two river reaches, 96 percent of the <br />larval captures occurred immediately below the Gunnison River confluence <br />(river miles 162 -164). Only two (4 percent) of the larvae were collected from <br />the upstream reach. These observations may indicate that most fish were <br />spawned in the downstream reach or that the larvae were spawned in the <br />upstream reach and drifted downstream to the area where most of the captures <br />were recorded. <br />Postlarval Younq -of -Year Occurrence <br />No postlarval young -of -year Colorado squawfish greater than 25 mm total <br />length were collected from above the Gunnison River confluence in a total <br />of 57 samples collected in the fall of 1982 -1986. However, a total of <br />62 Colorado squawfish were collected in the 15 -mile reach below the confluence <br />of the Gunnison River (54 samples). The 1982 -1984 catch rate of young -of -year <br />
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