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Last modified
8/11/2009 11:32:57 AM
Creation date
8/10/2009 4:53:29 PM
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UCREFRP
UCREFRP Catalog Number
9295
Author
Chart, T. E., D. P. Svendson and L. Lentsch.
Title
Investigation of Potential Razorback Sucker (Xyrauchen texanus) and Colorado Squawfish (Ptychocheilus lucius) Spawning in the Lower Green River 1994 and 1995.
USFW Year
1997.
USFW - Doc Type
Moab, Utah.
Copyright Material
NO
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G~~ ~ ~~ <br />~ :. ~~ <br />~ !~,s <br />RESULTS '`'!~1~ ~,U ~~~ . ~ J`' <br />~, ~' ~~ ~ 1 <br />~~ <br />Razorback suckers ~~ ~ ~~( `~' ~ ~ , <br />Adult sampling 1 ~U" ~~ <br />~~ <br />No adult razorback suckers were found during specific project sampling, however one adult ~ , ~ C <br />razorback sucker was collected while conducting ISMP electrofishing in 1995 at Mineral G~f~ ~ ~,~ ,~ <br />~ .~ t <br />Bottom. This fish (TL= 559mm, Wt = 2150 g, PIT # = 1F74374E68) was caught 43 miles below ~ , <br />the San Rafael River at RM 53.8 on May 1b, 1995. ~ `~Q~-a ~ ~ ~~~~ <br />~' v ~S <br />In 1994, 14.9 hours of electrofishing effort was expended in the study areab, l9 hours in 1995. <br />Flannehnouth suckers (Catostomus latipinnis) were the most abundant species collected both <br />years. In 1994, other species collected in order of decreasin ance.~ere: channel catfish <br />(Ictalurus punctatus), common carp (Cyprinus carpio), C lorado uawfis and bluehead sucker <br />(C. discobolus) (Figure 3). In 1994, 19.5% of the flanne ~ uth rs coll in the Green <br />River main channel were tuberculated and 6.5 % of those were running ripe. No o fish <br />showed signs of reproductive maturity. In 1995, walleye (Stizostedion vitreum) were cull ed in <br />addition to those species collected the previous year (Figure 4). Only one flannelmouth sucker <br />was running ripe of those collected in 1995, 14% were tubercazlated, and 27.4% appeared to be in ~}~ <br />post spawn condition. One bluehead sucker was tuberculated. /~ y \ <br />Larval / YOY sampling ~ ~~ \~ <br />A total of 333 ~ . ~~ <br />.2 and 458.7 larval trap hours were accumulated m 1994 and 1995, respectively. U ~~` ~ <br />In 1994, a total of 441aival razorback suckers were collected in the lower Green River near the ~ ~\~ <br />j -f the San Rafael river (RM 97.0) with the majority of those (n=36, 82.8%) collected on ~' %~ <br />/ June O 1 1). Collection dates ranged from May 17th to June 16th, and total lengths <br />ranged from 10 up to 14.2 mm (Figure 5). Four sympatric native species were collected: <br />flannehnouth sucke , bluehead suckers, speckled dace and Gila spp. in decreasing order of <br />abundance (Figure 6)~~ Sympatric native sucker collections peaked on the same day as the <br />razorback collections. \Red shiners (Cyprinella lutrensis) were the most abundant species overall <br />in the 1994 collections, accounting for 53.7% of the total catch (N= 2041). Non-native cyprind <br />collections generally incr through the period of study. <br />~\ <br />~~ <br />I, <br />DRAFT ~, g ~ ~~~, <br />ti <br />!~~ <br />
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