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Last modified
7/14/2009 5:02:37 PM
Creation date
5/24/2009 7:11:02 AM
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UCREFRP
UCREFRP Catalog Number
9673
Author
Tyus, H. M. and G. B. Haines.
Title
Distribution, Habitat Use, and Growth of Young Colorado Squawfish in the Green River Basin, Colorado and Utah - Preliminary Report.
USFW Year
n.d.
USFW - Doc Type
Vernal, UT.
Copyright Material
NO
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carp ~prinus car io, channel catfish Ictalurus punctatus, black bullhead <br />Ameiurus melas, smallmouth bass Microaterus dolomieu, green sunfish <br />Le orris cvanellus, bluegill L. macrochirus, mottled sculpin Cottus bairdi, <br />and mosquitofish Gambusia affinis. <br />Growth and survival.-Young Colorado squawfish averaged 40 mm TL in <br />October (range = 29.0-47.3 mm), and the average annual size was the same <br />in the upper and lower Green River (39.7 upper, range = 29 - 46.3 mm TL; <br />39.9 lower, range = 30 - 47.3 mm TL). However, mean TL was different <br />between the two areas for five of the nine years studied (t-tests, P < <br />0.01), and the fish were larger in TL in the upper area in four of five <br />years (Table 5). <br />The relative abundance (loge x fish/100 m2) of age-0 Colorado squawfish <br />captured in October was inversely correlated with late summer flows in the <br />upper (strata D, E, F) and the lower (strata A, B, C) Green River. (r = - <br />0.87, P < 0.01 for upper). r = - 0.84, P < 0.01 for lower). Fish TL was <br />also inversely correlated with late summer flows, particularly in the <br />lower Green River (r = -0.81, P <0.01 lower; r = -0.57, P = 0.11, upper). <br />We were unable to detect a pattern of overwinter mortality in age-0 <br />Colorado squawfish. Spring catches (range = 0 to 289 fish/1000m2) were <br />greater than catches the previous autumn in four out of eight cases, and <br />these ranged from 0.24-2.08 times higher in the lower and from 0.73-9.15 <br />times higher in the upper Green River. Young Colorado squawfish caught in <br />spring were larger (x_ = 45.2, N = 1,194) than those caught in autumn (x = <br />42.3, N = 1,243). When partitioned into upper and lower Green River, the <br />mean TL of fish in March and April {x = 46.9, N = 191 upper, _x = 44.7, N = <br />1,003 lower) were greater than fish sampled in the same areas the <br />11 <br />
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