9701

• UCREFRP Catalog Number: 9701
• Author: Modde, T., Z.H. Bowen and D.C. Kitcheyan.
• Title: Spatial and temporal use of a spawning site in the middle Green River by wild and hatchery-reared razorback sucker.
• USFW Year: 2005.
• USFW - Doc Type: Transactions of the American Fisheries Society
• Copyright Material: YES

W
940 MODDE ET AL.
TABLE 1.-Dates, size, sex, capture status, reproductive condition, origin and disposition after capture of razorback
suckers collected from the Escalante spawning area (river kilometer 504.3) in the middle Green River, Utah, between
1 and 22 May 2000.
Date in Total length Transmitter Year
2000 (mm) Weight (g) Sex Origin code Disposition stocked Year-class
May 1 507 1,389 M Wild 38 Released
426 757 M Hatchery 39 Released 1999 1994
510 1,453 F Wild Hatchery
May 2 510 1,475 M Wild Hatchery
May 5 474 980 F Hatchery 33 Released 1998 1991
518 1,430 M Wild Hatchery
414 685 M Hatchery 40 Released 1999 1993
536 1,649 M Wild Hatchery
492 1,440 M Wild Hatchery
533' 1,578 M Wild 41 Released
389 580 Hatchery 32 Released 1999 1993
399 611 Hatchery Released 1999 1993
May 8 464 1,135 M Wild 34 Released
410 572 M Hatchery 36 Released 1999 1993
405 661 M Hatchery Released 1999 1993
520 1,453 F Wild Hatchery
400 607 M Hatchery Released 1999 1993
May 9a
May 11 468 999 M Wild Hatchery
471 954 F Hatchery Released 1999 1991
400b Released
May 12a
May 15 533 Released
May 17 4054 351 Released
May 22a
a Four electrofishing passes produced no fish.
b Recaptured from May 8.
e Recaptured from May 5.
d Recaptured from May 8.
e Fish with transmitter code 35 was initially captured on May 8, but no transmitter was attached. It was recaptured on May 17 and a
transmitter was attached on that date.
soo 20
9
J! 400 15'a
w 8 300 - V
10 :
p S 200 C
m
- 100 5
E
m
0- 0
10
= B
LL 6
0
S 4
2
z 0
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Date
FIGURE 2.-Temperature (circles) and discharge
(squares) on the studied spawning bar (middle Green
River, Utah, at river kilometer 504; upper panel) com-
pared with the numbers of razorback suckers collected
via electrofishing (hatched bars) and detected (solid
bars) by a stationary telemetry logger (lower panel).
fish were detected from 12 to 18 of May when the
daily temperature ranged from 10.2°C to 13.4 C°.
Flows between 11 and 18 May ranged from 205
m3/s (16 May) to 294 m3/s (13 May). No fish were
detected in the vicinity of the spawning bar after
water temperature exceeded 17°C and flows ex-
ceeded 294 m3/s. Peak discharge at the Jensen,
Utah gauge occurred 7 d later (1 June) at 479 m3/
S. Water temperature associated with peak dis-
charge was 17°C.
Time spent in the vicinity of the spawning bar
by radio-tagged fish was equally divided between
diurnal and nocturnal hours (Figure 3). During
four diel monitoring efforts, four individual fish
were monitored in the spawning area. During the
16-17 May and 18-19 May surveys, transmitter
codes 39, 40, 36, and 33 were located near the
spawning area (Figure 4). Fish 33, the only female
implanted with a transmitter, was first located near
the spawning bar on 15 May (implanted 10 d pre-
viously). During diel monitoring, fish 33 was not
located on the spawning bar between 2330 (18
May) and 0250 hours (19 May). During 18-19
2500
M
'08 2000
O
V
i 1500
H
7
O
t 1000
O
d
500
E
7
z
0
33, 35
1
FIGURE 3.-Diurnal
(1900-0659 hours) pe
back suckers were rec(
spawning bar (middle
meter 504) between 1
May, fish 33 was dt
stream of the spawn
itored 23-25 May
stream from the spa
last diel monitoring
the spawning area ((
before the completi
riod.
A
FIGURE 4.-Locati,
Utah, at river kilome