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Last modified
7/14/2009 5:02:36 PM
Creation date
5/22/2009 7:30:44 PM
Metadata
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Template:
UCREFRP
UCREFRP Catalog Number
9583
Author
BIO/WEST Inc.
Title
Annual Summary Report 1993 - Survival of Age-0 Colorado Squawfish in the Green and Colorado Rivers (UDWR Contract No. 90-2558).
USFW Year
1994.
USFW - Doc Type
Logan, UT.
Copyright Material
NO
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1 <br />3.2 REACH 4 -THE UPPER GREEN RIVER <br />Reach 4 on the Green River extends from the Split Mountain Campground (RM 320) in Dinosaur National <br />Monument to Sand Wash (RM 216). Backwater habitats sampled in this reach from 1987 to 1993 averaged <br />2.1 ft deep (n = 550). Backwater temperatures during fall sampling averaged 16.5°C, Green River <br />mainchannel temperatures averaged 14.8°C. During spring sampling backwater temperatures averaged 14.7°C <br />and mainchannel temperatures averaged 11.7°C. <br />' 3.2.1 1989 Year Class <br />' A total of 151 age-0 Colorado squawfish were captured in this reach in fall 1990, resulting in a CPE of <br />1.41/100 m2. This compared to 48 age-0 captured in spring 1991 for a CPE of 0.52/100 m2 (Table 5). CPE <br />between fall 1990 and spring 1991 decreased by 63%, and total numbers decreased by 68%. <br />3.2.2 1990 Year Class <br />A total of 62 age-0 Colorado squawfish were captured in this reach in fall 1989, resulting in a CPE of 0.50/100 <br />' m2. This compared to 25 age-0 captured in spring 1990 for a CPE of 0.55/100 m2. CPE between fall 1989 and <br />spring 1990 increased by 9%, and total numbers decreased by 60%. <br />3.2.3 1991 Year Class <br />A total of 525 age-0 Colorado squawfish were captured in this reach in fall 1991, resulting in a CPE of <br />3.71/100 m2. Catch rate dropped 67% to 1.20/100 m2 in spring 1992. Total number of squawfish captured <br />' dropped by 65%, from 525 to 184. <br />3.2.4 1992 Year Class <br />' A total of 180 age-0 Colorado squawfish were captured in this reach in fall 1992, resulting in a CPE of <br />1.29/100 m=. Catch rate dropped 70% to 0.39/100 m' in spring 1993. Total number of squawfish captured <br />' dropped by 61%, from 180 to 71. <br />3.3 REACH 1 -THE LOWER COLORADO RIVER <br />' Reach 1 on the Colorado River extends from Fish Ford (RM 106) to the confluence of the Green and <br />Colorado Rivers (RM 0). Data presented here for Reach 1 includes only the lower 50 miles, above the <br />confluence. Backwater habitats, sampled in this reach since 1987 averaged 2.3 ft deep (n = 515). Backwater <br />temperatures during fall sampling averaged 24.5°C, Colorado River mainchannel temperatures averaged 22.4°C. <br />During spring sampling backwater temperatures averaged 20.4°C and mainchannel temperatures averaged <br />17.2°C.Analyses of overwinter survival for Reach 1, including catch rates of sympatric species and catch rates <br />' and numbers of Colorado squawfish were performed by the Service, Grand Junction CRFP Field Station. A <br />brief summary of CPE's and total numbers are presented here for purposes of comparison. <br />3.3.1 1987 Year Class <br />' A total of 31 age-0 Colorado squawfish were captured in the lower 50 miles of this reach in fall 1987 (Table <br />6), while only 8 were captured in spring 1988. CPE in fall was 1.24/100 m2, compared to 0.45/100 m2 in <br />spring. CPE and total numbers decreased by 64% and 74%, respectively. <br />' Fish ca lured in fall avers ed 44 mm TL while those ca lured ins rin about 6 months later avers ed 57 <br />P g P P g, ~ g <br />mm TL. Average growth of age-0 squawfish during the 6-month winter period was 13 mm; most of the growth <br />probably occurred during October, 1987, which remained a relatively warm and mild month. Average length <br />7 <br /> <br />
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