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

-r _,?v _.ro:?c. C2t.e-. and status of data a.naivsls
Al 1 szmo 1 1 nq was conducted -on the Yamoa Ri ver dur 1 nq the 1 OE 35 f 1 el d
season. F: =h sa.moi ina areas ranged from rivermi le (RMI) ills to 8.
Habitats were censused at high flow from RMI 127 to the Green Fiver.
confluence (RMI 0). We are finished with field collections for 1985 at
high flow. Soawninq. and base flow. .The habitat census has not been
comDeeted for the current base flow period; aooroximately 70 miles ..
remains tc ne surveved. concentrating mainly on eddv and pool depths
and frecuen_ies. Summaries of aeneral fish collections have not been
comol=t=d rncr nas habitat data. been compiled or summarized. Included
in this report are all adult endangered fish caotures. a summary of
where and when collections tool: place. and general observations of the
rata.
A tots: of 50 Colorado souawfish were collected in 1985. During
'"a.v Gre-seawnina samDlina we collected 26 souawfish of which 4 were
recaDture= in July (soawninq samolina) 16 with one recapture; and in
Eectember (ease flaw). eight of wnich two were recaptures (Tables 1 and
=--=^aWr1MC SSTDlinC
25-7.0
Sts+,aarb sampliha stations Included Juniper Springs. Sunbeam. and
lv Part:. In addition. we samoled 'the followine "control" 8ta?lons:
Horse Gulcr.. PLM backwater, and Lay Creek. An electrical short in the
shcci,-na unit caused us to. curtail samolina in Lilly Park on the
ass Cav. We.Derformed habitat census from RMI 1-7-(:1. Some trammel '
n samolina (Mav 20-'21) was attempted im UPDer Yampa. Canvon. but high
::2.=er ccnc::icns and floatina debris made samaling difficult and less
_----tlve.
Above =mca Canvon (Ma.' no souawfish were captured in the
standard*-ed samollr.a 51Ces Minkh consisted Cl main raver
..a t _ - 7 All ' 26 sauawfisn _aGtured at this time were either from
`
1 LC.L _ I . _
cutarv = =am backwater or man-made arti'f1c1al backwaters (for.mer
Z- : c e z-nr=i_= :moounded at :he upstr=am end). A new collection
=_=? ;:ct!a =._ used in the=_e areas tn-t con=sisted of blocking the
backwater wil-n trammel net orior to shockina. This
_cnr.la_!e _ro•1cd effective in caDt_urlna souawfish that would otherwise
to avoid cariture t'; f1eeinq to the river channel.
^! lr:: a N samol i na we collected the largest ever- number of northern'
= usua: :r. close association with souawfish esDecially in 1
`,acitats. At the mouth of Lav Creel:. a tributary. stream
enters the 'famca River just below JUniGer Sorinq s Canvon. 12
r=r--hern c: '.:E- were collected. four o4 which had either hooks or lures
:n tnr ccut?.s. NC souawfish were collected from this location. ..A
E northern ci tae were - • ther collected or 'si ahted dur i no this
r.^ r the f i rst ti me `_t'._.t the number of :Di k:e col l ected
?Sa •c 2 EC' s,:.To l 1 r.G _` a3t.On at Lill v i rl and then proceeded
=-,ro_!a` L:r.o=_-?!r !Ja*_ior, 2 Monumer* (Drdm) fcr sGawnlno sampling.
from Fril -0.0-3.
San.ol=t Standcird samolinq stations at Sunt.eam and Junioer Sprlnas
Elever. ==uawfish were collected in Yamoa Canyon during the spawninq
--?_r1c• ?c_it:an, three h±.r.Ota_t chub were also collected lr. Dr1M.
w,&s cCG-rr1nC in the canvon Our standardized samolinc
?.ive souawfish
1 ±hE? ?? ;' c In erestingl•,-. f
_ c ..i--d
r.:.,i -_. _x.0 . .a`-`` ut9`?n ?f93??"+ -- -• -- -----