9639

• UCREFRP Catalog Number: 9639
• Author: Peterson, E. and N. Darnall.
• Title: Phase 5 Middle Green River 1998 Collection Report.
• USFW Year: 1999.
• USFW - Doc Type: \
• Copyright Material: NO

08/09/99 MON 17:03 FAX [phone] USFWS-Utah Field Office
Invertebrates (crayfish) were collected with seines or minnow traps,
labeled, weighed and placed on dry ice in the field. They were then
shipped to the lab.
All samples, except muscle plugs, were analyzed at Geochemical &
Group for selenium using Graphite Furnace Atomic Absorption. Qi
control was provided by the Patuxent Analytical Control Facility.
Results and Discussion
4-?4 RO-COKANUT 9 004
in Whirl Paks®,
in a freezer until
ivironmental Research
ity assurance and quality
There were a total of 8 sampling periods in Stewart Lake during 199 , beginning in April and
ending in August. Figure 1 shows the sampling events correlated wi approximate Green River
flows. In FY98, 49 whole-body fish, 2 bird eggs, 1 muscle plug and invertebrate samples were
collected for selenium analysis at various sites throughout Stewart L e (Table 1). Appendix B
shows the species composition, location and date of capture of whole body fish in Stewart Lake.
In addition to collections made in Stewart Lake, collections were
August (Figure 2). These collections included at least 3 fish sam
Escalante Bar, above Stewart Lake, downstream approximately e
Wildlife Refuge (Table 2). Also collected in Green River backw
Stewart Lake (Figure 3), were small fish, invertebrates and sedirr
Endangered species
During collection of whole-body fish in Stewart Lake, 4 Colorado pi
lucius) were caught in trammel nets. Two were captured at the delt,,
the other two were captured near the outlet (Table 4). Fish were wei
however, only one fish had a muscle plug taken, and PIT tag status v
Both Colorado pikeminnow collected at the inlet were smaller than t
made on the Green River in
from ten locations from
6 miles to Ouray National
, both above and below
(Table 3).
eminnow' (Ptychocheilus
formed by the new inlet and
hed and measured;
is unknown for all fish.
ose collected at the outlet.
A total of 7 Colorado pikeminnow were collected in the Green Rive during whole-body fish
collections on the Green River in August (Table 5). These fish were weighed, measured, pit
tagged (if scanner was available) and had a muscle plug taken. Fish total length ranged from 405
mm to 649 mm. For PIT tags there were 2 recaptures, 2 new captur sand 3 unknowns. As of
January 1999, results of selenium analysis in muscle plugs have not en received from the lab.
2In 1998 the Names of Fishes Committee proposed replacing
name squawfish with
pikeminnow (Nelson et. al., 1998).