7730

• UCREFRP Catalog Number: 7730
• Author: Wick, E. J. and J. A. Hawkins.
• Title: Colorado Squawfish and Humpback Chub Population and Habitat Monitoring.
• USFW Year: 1985.
• USFW - Doc Type: Grand Junction, CO.
• Copyright Material: NO

ind.icatina that these were most lid:elv immature fish. These findinas
Support our a::sistina hvocthesis that sauawfish very likely establish
residency in the Upper Yamoa as immature fish. likely migrating from
downstream nursery areas in the Green River. .We also collected a
721mm TL. 8lb sauawfish while angling in Juniper Canyon. This fish
showed no indications that it was in spawnina condition (no
tuberculation. sex. products. enlarged anus. etc.). It also was
actively feeding as evidenced by it' taking the spoon] This fish was
rooarently a mature female which was not spawning this'vear. The
=ollection of this fish and oossibly some of the other smaller
sauawfish supports our radiotelemetrv findings in 1982. which indicate
=nat souawfish may not spawn every vear.
=oa.wn• ng =amo1 i ng
Eez t.: ember 1=-15. '20
We sampled standard samoling stations includinq Lilly Park. Juniper
=_=rincs and Sunbeam. Mavbell was sampled as the "control" station.
Six of the eight fish captured in September were collected by
^gl:na. once again demonstrating sauawfish vulnerability to analina at
c_rt_in times of the year. All souawfish caught anglinq were from deep
tool or. ad;acent eddy habitats. The hiahliaht of our fall, trip was the
rec2cture of a 55'-"mm TL souawfish near Sunbeam RMI 71.6 on September
":.1°e,. (Table 2). This fish was originally taaaed by the USFWS•on the
Green River in Split Mountain Canyon (RMIL -3,222.6) on June 27.1981. when
?r it TL. This. same fish was indentified as a male when recabtured by
the 1ISF140S 0 u 1 v 25.1?84 or, the Yamoa River So=wnine area RMI 18.2 when
=-"rim, TL.

?. Enter CATCH data from 1?0_t samviina. "
Comoile TZcE fish caotures (RARE) records.
Finish Habitat field work.
4. Begin anal vsi s of habi `at. _ca. ta.
F'reoare and mount.bonv =_tru_tures from sauawf:sh (orovided by
USFWS) for aae and growth work.
?-':r,zte data entry with DOW contractors for 1977-1985 data
(Denver Water Board contract).
F'rec._re plans for 198E fiela season. .