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1985 SALMON ESCAPEMENT
SURVEY REPORT
-·'
BRADLEY LAKE
HYDROELECTRIC PROJECT
BRADLEY RIVER . KENAI PENINSULA, ALASKA
FEDERAL ENERGY REGULATORY COMMISSIO N
PROJECT NO . P-8221 -000
Alaska Power Authority_
Hydro/Wood/Coai/Solar/Wind/Geothennai/Conseroation
Bradley Lake Hydroelectric Project
1985 Salmon Escapement Survey Report
Prepared For
Stone & Webster Engineering Corporation
800 A Street
Anchorage, Alaska
Prepared By
Northern Technical Services, Inc.
December 1985
TABLE OF CONTENTS
1.0 INTRODUCTION •••.••
2.0 MATERIALS AND METHODS.
2.1 Hoop Nets
2.2 E1ectroshocker •
2.3 Other Fishing Techniques •• . . .
2.4 Data Collection . . . . . . . . .
3.0 RESULTS.
4.0 DISCUSSION • . . . . . . . . . . . . .
5.0 RECOMMENDATIONS . . . . .
6.0 REFERENCES •••• . . . . . .
APPENDIX A. Bradley River Salmon Survey Catch and
Statistics Data.
i
1
2
2
4
4
6
7
11
15
17
LIST OF FIGURES
Figure Page
l. Area map of lower Bradley River showing location
of base camp, hoop trap sites and electrofishing
area surveyed in the 1985 salmon escapement
survey . . . . . . . . . . . . . . . . . . . . . 3
2. Detail of electrofishing sites surveyed August
22-28, 1985, as part of the salmon escapement
survey. A-Riffle Reach: B-hoop net trap area • 5
LIST OF TABLES
Table
1. Summary catch record by hoop net traps
on the lower Bradley River, August 1-28,
2.
198 5 . . . . . . . . . • . . • . .
Summary of catch record for backpack
electroshocker, lower Bradley River,
August 22-28, 1985 ••••.•••.•
iii
8
9
1.0 INTRODUCTION
The Bradley Lake Hydroelectric Project is located at the head of
Kachemak Bay approximately 27 air miles from the city of Homer.
Completion of this project will reduce and stabilize the flow of
water in the lower Bradley River and potentially affect salmon
runs in the river. As part of project design, the Bradley River
system is currently the focus of extensive hydrologic and
environmental studies.
A salmon escapement survey was conducted in August 1985 on the
lower Bradley River as part of these continuing studies. The
survey was based primarily on hoop net and electroshocker
techniques. While the focus of the study was to enumerate pink
salmon escapement, the report discusses all fish captured in the
study. Field data collected during the study have been tabulated
in Appendix A.
1
. I
I
2.0 MATERIALS AND METHODS
2.1 Hoop Nets
Hoop nets were utilized in arrays of ten nets deployed in the
river at two locations. The downstream array was positioned at
approximately River Mile (RM) 3.7, downstream of a large rock
where the base camp was located (Figure 1). The upstream array
was positioned above Hooligan Slough at approximately RM 4.0. In
these areas the Bradley River is subject to tidal fluctuations
with some current reversal at the lower station. The hoop nets
were serviced on a daily basis, weather permitting, by on-site
project personnel.
The hoop net traps were constructed of 2-1/2 inch hexagonal wire
mesh and were three feet in diameter by eight feet long. A wire
mesh cone, with a seven-inch diameter throat, formed the entrance
to the trap. The back panel was constructed so that one half of
it could be opened to remove captured fish. The back hoop was
also rigged with a short line tied to a heavy shackle. In order
to hold the hoop net in position in the current, the shackle was
dropped over the end of a steel rod ("re-bar"} which had been
driven into the substrate. Pink salmon in turbid waters tend to
orient with the river bottom and move up-current to the spawning
grounds, avoiding the fastest water flow in the middle of the
channel. Therefore, the traps were arrayed five from each bank
toward the center of the river. Their positions were chosen to:
a. Cover as much of the migration corridor as
possible:
b. Allow complete submergence of the shallowest traps
-
at low tide: and
c. Present the most uniform sampling array possible
to migrating fish.
2
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I
I
i
I
I
LOWER TRAP SITE
0~5iiiii500ft.
SCALE
RIFFlE REACH
ELECTROFISH AREA
Figure 1. Area map of lower Bradley River showing location of
base camp, hoop trap sites and electrofishing area
surveyed in the 1985 salmon escapement survey.
3
2.2 Electroshocker
Electrofishing was performed in the Riffle Reach area (Figures 1
and 2) at approximately RM 4.7. Sampling was also conducted in
the vicinity of the hoop net arrays at RM 3.8 and 4.0. A
backpack Smith-Root Model XII electrofisher, set at 700-900 VDC,
60 Hz was used. Two field crew members performed the survey
either by wading along the shore or drifting through the reach in
mid-channel from a tethered boat. At the hoop net sites, 1000-
2000 ft 2 was fished during each effort; whereas in Riffle Reach,
1000-3000 ft 2 was fished. Electrofishing effort was concen-
trated at Riffle Reach because river characteristics in this
reach were best suited to operational requirements of the
backpack shocker equipment.
2.3 Other Fishing Techniques
During the first three days of the field effort, both dip net and
seine techniques were employed to assess whether pink salmon were
present in the river at the beginning of the survey. Dip netting
was conducted at Tree Bar Reach on August 1. The south bank was
_systematically sampled for a distance of approximately 500 feet,
from shore to a water depth of three feet, with a large salmon
landing net.
A 100 X 4 ft, 1/4 inch square mesh, nylon seine was fished in the
lower end of Riffle Reach on the same day. One end of the seine
was fixed on shore and then the free end extended across the
river and allowed to drift downstream. During this drift, the
shore fast end was moved approximately 50 yards downstream. The
free end of the seine was then brought to shore and the seine
retrieved.
4
RFR...E REACH
LOWER TRAPS
8
N.JT
lFPER TRAP
AREA 100" x 10'
LEGEND
ARR -ABOVE RIFFLE J --
REACH
EPR -EAGLE POOL REACH
MRR -MID RIFFLE REACH
OPN-OATAPOO SITE.
NORTH BANK
AL T -ABOVE LOWER
TRAP SITE
AUT -ABOVE UPPER
TRAP SITE
NOT TO SCALE
Figure 2. Detail of electrofishing sites surveyed August 22-
28, 1985, as part of the salmon escapement survey.
A -Riffle Reach; B -hoop net trap area.
5
2.4 Data Collection
The following information was recorded from the captured fish:
species, sex, general condition, fork length, date of capture,
and presence of marks or tags. Two colors of plastic anchor tags
were applied to all captured fish to denote collection location.
In the case of electrofishing, the date of capture was also coded
by tag position since Riffle Reach is a known spawning ground.
In addition, water temperature was recorded on a daily basis
using an Omega AET 450 digital thermometer accurate to O.l°C.
This instrument malfunctioned on the fourth day and was replaced
by a mercury glass thermometer. Unfortunately, it arrived with a
broken mercury column. It was replaced with another mercury
thermometer with a resolution of 0.2°C.
Incidental observations were also made on the presence of harbor
seals in the lower Bradley River. These observations were
initiated during the second week of the study effort.
6
3.0 RESULTS
The hoop net traps captured 12 fish at the lower station; they
included 11 pink salmon and 1 chum salmon (Table 1). A total of
21 fish were captured at the upper station; they included 15 pink
salmon, 5 chum salmon, and 1 silver salmon. There were no
recaptures. Daily catch results are listed in Appendix A, Tables
A-1 and A-2. The number of recaptures obtained in the hoop net
sampling effort was not sufficient to use in estimating the
escapement population of pink salmon.
A Schumacher multiple mark-and-recapture estimator (Ricker 1975)
was used to estimate the population of spawning pink salmon in
Riffle Reach from electroshocker data. The electrofishing effort
captured 66 fish; they included 65 pink salmon and 1 chum salmon
(Table 2). One pink salmon was a recapture. This resulted in a
population estimate of 771 pink salmon, with upper and lower 90
percent confidence limits of 3,356 and 435 fish, respectively.
An estimate based on the area of the spawning ground is also
possible and may be more reliable. Previous studies (Woodward-
Clyde Consultants 1983) indicate that Riffle Reach measures
approximately 150,000 ft 2 in area. On four of the seven days
several locations (DPN and MRR; Figure 2) in Riffle Reach were
sampled with a consistent sampling effort (3000 ft 2 was fished).
On those days a total of 43 pink salmon were captured resulting
in a daily average of 10.75 fish. Assuming that the spawning
gravels are of uniform distribution and quality, a proportion can
be calculated as follows:
150,000 ft 2 total area of Riffle Reach
3,000 ft 2 spawning ground sampled
x 10.75 pink salmon
captured (daily avg)
= 537 total pink salmon present on the grounds of Riffle
Reach.
7
Table 1. Summary catch record by hoop net traps on the lower
Bradley River, August 1-28, 1985.
Total Pink Chum Silver
Station Trap Days Salmon Salmon Salmon Total Fish
Lower 224 11 1 0 12
Upper 222 15 5 1 21
Recaptures 0 0 0 0
8
Table 2. Summary of catch record for backpack electroshocker,
lower Bradley River, August 22-28, 1985.
Location
Lower Trap site
Upper Trap site
Below Riffle Reach
Above Riffle Reach
Riffle Reach *
Total
* One recapture at
Area
Fished
(sq ft)
2000
1000
2000
3000
3000
No. Days No. Fish No. Fish
Fished Observed Captured Species
2 0 0
2 0 0
2 15 10 Pink salmon
2 15 6 5 Pink salmon,
1 Chum salmon
4 144 50 Pink salmon
17 4 66
this location.
9
Both dip nettinq and seining techniques were employed on spawning
grounds of the Bradley River. Tree Bar Reach was sampled by dip
net on August 1. Approximately 500 feet of shoreline was sampled
out to a water depth of 3 feet. A total of six fish were
captured in this effort. Three of the fish were captured at the
head of Tree Bar Reach and three from the lower end. All fish
were in very good condition. No data were collected from these
fish since the technique was employed only to assess whether pink
salmon were present in the river system at the start of the field
sampling effort.
Seining was conducted on Riffle Reach on the same day to assess
whether pink salmon were in this spawning reach as well. One
seine haul was made through the lower half of the reach to
approximately mid-river. This haul resulted in the capture of
one pink salmon and one juvenile dolly varden; three fish were
also observed escaping from the seine.
10
4.0 DISCUSSION
The 1985 spawning run of pink salmon was the returninq 1983
year-class. In Kachemak Bay the odd-year runs of pink salmon are
usually larger than the even-year runs (Alaska Power Authority
1985). However, the Bradley River is reported to have sustained
an unusually large spring flood in 1983 which scoured the
riverbed and may have killed many pink salmon fry before they
were ready to outmigrate (Woodward-Clyde Consultants 1984).
Therefore, the results of the 1985 salmon escapement survey may
reflect an unusually low return of pink salmon spawners.
Population estimates for the 1985 run of Pink salmon are based on
the electrofishing data. Certain assumptions were made in the
analysis of these data.
1. Tags are not lost from the fish. This assumption
was reliable because the tag scar would have been
recognized, even if the tag itself were lost.
2. Tagged and untagged fish suffer the same mortality.
3. Tagged and untagged fish are equally vulnerable to
capture.
4. All marks are recognized and reported.
5. Negligible recruitment or migration occurs during
the study. This assumption was not reliable.
6. The marked fish become randomly mixed with the
unmarked fish. This assumption could not be
verified. The tagged fish were free to mix with
through migrants, and to leave the sampling area.
11
7. The areas selected for electrofishing were repre-
sentative of the spawning grounds in Riffle Reach.
This assumption could not be verified. The
sampling areas were selected based on accessibility
to the sampling techniques.
The population estimates derived in this study were 537-771 pink
salmon in Riffle Reach. If it can be assumed that the density of
spawning salmon in Tree Bar Reach (the other major spawning ground
in the Bradley River) is the same as in Riffle Reach, then an
extrapolation can be calculated. The spawning area of Riffle
Reach is half that of Tree Bar Reach (Woodward-Clyde Consultants
1983). Multiplying the Riffle Reach estimates by 3 (to achieve an
estimate of the total) yields a range of 1,611-2,313 pink salmon
in the Bradley River in August 1985.
The estimates of the 1985 pink salmon spawning run (1,600-2,300
fish) are consistent with the estimates made by previous in-
vestigators (Corps of Engineers 1982, 1985; Woodward Clyde
Consultants 1983). In fact, the 1985 run may have been toward
the low end of the odd-year range.
Based on the 1985 estimates and on the apparent proportion of
chum to pink salmon in the August 1985 catches, there may be a
greater chum salmon run in the Bradley River than previously
estimated. However, the data are inconclusive due to the low
number of fish captured. In this study, 6 chum salmon and 26 pink
salmon were captured in the hoop net traps. Since the 1985
estimate of the pink salmon run is consistent with other invest-
igations, one might assume that the percentage of chum to pink
salmon (23%) may be the same; this implies that a run of several
hundred chum salmon may exist. However, existence of such a chum
population is not supported by the electrofishing data. Only one
chum was captured during electrofishing at Riffle Reach. This
may be due in part to the fact that chum salmon run earlier in
the season than pinks or that chums captured in lower river traps
could have been strays milling from other areas such as Fox Farm
12
Creek. Over 100 chums were visually counted in Fox Farm Creek in
early August. The chums may be milling throughout the lower
Bradley River, or they may have been chased past Fox Farm Creek
by the many seals sighted near the mouth of the Bradley River
(see Appendix A, Table A-8), and therefore encountered the traps
more frequently than the pinks.
Surface water temperatures were collected throughout the study
period at the lower trap site (Appendix A, Table A-7). Although
several equipment malfunctions limited data collection, tempera-
ture values ranged from 7.4 to 9.6°C throughout this field
sampling program. This range is consistent with other data
collected on the lower Bradley River. During August 1985
temperature data were also recorded by three temperature data re-
corders located at Riffle Reach, Tree Bar Reach, and North Fork
Bradley River. The temperature ranges recorded from these three
stations for the month of August were 6.9 to 8.8°C, 7.3 to
9.5°C, and 5.5 to ll.0°C, respectively. Complete temperature
records are contained in a separate water quality data report
(NORTEC 1985). These temperature records are similar to data
collected by Woodward-Clyde Consultants (1983) where August
temperatures for the lower Bradley River were reported to range
from approximately 6.5°C to l0.0°C.
The 1985 field season showed that common salmon sampling method-
ologies were not as effective (measured in total numbers col-
lected) on the Bradley River as they are on rivers with larger
runs of salmon. This was in part due to the physical limitations
imposed on sampling in the lower tidal reaches of the river.
Specific sampling information gained from this field season
include:
l. The run of spawning pink salmon probably began
before the start of sampling on August l in 1985.
13
2. There is no way to discriminate Bradley River
spawners from fish straying (or chased by seals)
into the lower Bradley from other nearby river
systems.
3. The small population will require disproport-
ionately greater sampling effort to estimate size
with a reasonable level of certainty.
4. The hoop nets were unreliable due to clogging by
debris and detritus, reversin9 current at the
lower stations, and large tidal fluctuations.
14
5.0 RECOMMENDATIONS
The following recommendations are made based on the assumption
that monitoring of pink salmon populations will be a requisite
component of the Bradley Lake Hydroelectric Project.
1. Future sampling techniques should capture a greater
proportion of fish to yield more accuracy and
precision in population estimates. This may
require a technique which collects nearly all
spawners.
2. The sampling period should be expanded to address
chum salmon spawners and to identify the time
period in which pink salmon spawners return to
Bradley River.
3. Survey efforts should focus on upstream areas near
or on the spawning grounds to reduce the potential
for sampling "strays" and to minimize the influence
of tides.
Two alternative population sampling techniques are discussed
below: The first alternate involves seining the spawning grounds
(Riffle Reach, Tree Bar Reach, etc.) once or twice per week
during the summer. A multiple mark-and-recapture estimator
(Schumacher-type) may then be applied to all species of fish on
the spawning grounds. This would eliminate the problems of stray
fish~ the loss of stationary sampling gear due to debris,
currents, or weather; and uncertainty about the number of other
species of fish using the lower river.
The second alternate technique would be to census (rather than
estimate) the population as fish enter the spawning grounds. A
one-wing fyke-type net could be positioned at the lower end of
Riffle Reach. The heart of the trap would be in deep, slow-
15
moving water. The fish captured in the fyke trap would be
tagged, identified, enumerated, and released above the wing. A
wier and trap would be equally effective in this approach.
16
6.0 REFERENCES
Alaska Power Authority. 1985. Mitigation Plan-Bradley Lake
Hydroelectric Project. November 1985.
Corps of Engineers. 1982. Bradley Lake Hydroelectric Project,
Alaska, Final Environmental Impact Statement. Department of
the Army, Alaska District Corps of Engineers, Anchorage,
Alaska. August 1982. 184 p. with appendices.
Corps of Engineers. 1985. Bradley Lake Hydroelectric Project,
Alaska, Final Supplemental Environmental Impact Statement.
Department of the Army, Alaska District Corps of Engineers,
Anchorage, Alaska. September 1985. 158 p. with appen-
dices.
Northern Technical Services, Inc. (NORTEC). 1985. Bradley Lake
Hydroelectric Project Environmental Monitoring Program Water
Quality Data Report -August 1-31, 1985. Unpublished report
submitted to Stone and Webster Engineering Corporation, 800
"A" Street, Anchorage, Alaska. 2 p. plus attachments.
Ricker, W.E. 1975. Computation and interpretation of biological
statistics of fish populations. Bull. Fish. Res. Board
Can. 191: 1-382.
Woodward-Clyde Consultants. 1983. Bradley River instream flow
studies. Prepared for Alaska Power Authority, Anchorage,
Alaska. 77 p. with appendices.
Woodward-Clyde Consultants. 1984. Report on salmon fry sampling
in the Bradley River. Prepared for Alaska Power Authority,
Anchorage, Alaska. 6 p., with tables and figures.
17
APPENDIX A
Bradley River Salmon Survey Catch
and Statistics Data
August:t-1985
LIST OF TABLES
Table
A-1 Lower Hoop Trap site Catch Data for the
Bradley River, August 1-28, 1985 •.•••• A-1
A-2 Upper Hoop Trap site Catch Data for the
Bradley River, August 1-28, 1985 •••..• A-2
A-3 Catch Statistics for Captured Salmon at
the Lower Hoop Trap site Bradley River,
August 1-28, 1985. • • • • • • • • • • • A-3
A-4 Catch Statistics for Captured Salmon at
the Upper Hoop Trap site Bradley River,
August 1-28, 1985 ••••••••••••• A-4
A-5 Backpack Electroshocker Catch Data for
the Bradley River, August 22-28, 1985. • A-5
A-6 Catch Statis~ics for Captured Salmon using
Backpack Electroshocker in the Riffle
Reach Area of the Bradley River, August 22-
28, 1985 • • • • • • • • • • • • •
A-7 Surface Water Temperature Recorded during
Lower Bradley River Salmon Survey,
• A-6
August 1-28, 1985 ••••••••••• A-9
A-8 Incidental Harbor Seal Sightings in the
Lower Bradley River during Salmon Survey,
August 1-28, 1985 ••••••••••••• A-10
A-i
Table A-1. Lower Hoop Trap site Catch Data for the Bradley
River, August, 1-28, 1985.
Date
8-1
8-2
8-3
8-4
8-5
8-6
8-7
8-8
8-9
8-10
8-11
8-12
8-13
8-14
8-15
8-16
8-17
8-18
8-19
8-20
8-21
8-22
8-23
8-24
8-25
8-26
8-27
8-28
TOTAL
#: Trap
Days
10
10
10
9
10
10
10
10
9
9
9
9
7
7
6
6
2
2
2
5
5
9
9
9
10
10
10
10
224
If Fish
Captured
0
0
0
0
0
0
0
3
0
0
2
0
0
0
0
3
0
0
1
0
0
2
0
0
1
0
0
0
12
A-1
Species
Pink Salmon
Pink Salmon
2 Pink Salmon
1 Chum Salmon
Pink Salmon
Pink Salmon
Pink Salmon
Table A-2. Upper Hoop Trap site Catch Data for the Bradley
River, August 1-28, 1985.
fl: Trap # Fish
Date Days Captured Species
8-1 0 0
8-2 8 0
8-3 8 0
8-4 8 2 Pink Salmon
8-5 8 0
8-6 8 2 1 Pink Salmon
1 Chum Salmon
8-7 10 0
8-8 10 6 2 Pink Salmon
4 Chum Salmon
8-9 8 0
8-10 8 0
8-11 8 0
8-12 8 0
8-13 7 0
8-14 7 0
8-15 7 0
8-16 7 1 Pink Salmon
8-17 7 0
8-18 7 4 Pink Salmon
8-19 7
8-20 7 1 Pink Salmon
8-21 7 0
8-22 9 3 2 Pink Salmon
1 Silver Salmon
8-23 9 0
8-24 9 0
8-25 10 0
8-26 10 0
8-27 10 2 Pink Salmon
8-28 10 0
TOTAL 222 21
A-2
Table A-3. Catch Statistics for Captured Salmon at the Lower
Hoop Trap site Bradley River, August 1-28, 1985.
Fork
Length
Date Species Sex (in) Condition
8-8 Pink M 24.0 Good
8-8 Pink F 19.5 Good
8-8 Pink M 25.0 Good
8-11 Pink M 20.5 Good
8-11 Pink F 20.5 Good
8-16 Pink F 20.0 Dead
8-16 Chum F 21.5 Good
8-16 Pink M 20.5 Good
8-19 Pink F 22.0 Good
8-22 Pink M 21.5 Fair
8-22 Pink M 21.0 Good
8-25 Pink M 20.0 Fair, spawned out
A-3
Table A-4. Catch Statistics for Captured Salmon at the Upper
Hoop Trap site Bradley River, August l-28, 1985.
Fork
Length
Date Species Sex (in) Condition
8-4 Pink M 19.0 Good
8-4 Pink F 21.5 Dead
8-6 Chum F 23.5 Good
8-6 Pink F 21.0 Good
8-8 Chum F 26.0 Good
8-8 Chum F 25.0 Fair
8-8 Chum M 19.5 Fair
8-8 Chum F 24.0 Fair
8-8 Pink ? 18.0 Good
8-8 Pink M 21.0 Good
8-16 Pink M 20.0 Very Poor
8-18 Pink M 19.0 Poor
8-18 Pink M 19.5 Good
8-18 Pink F 18.0 Good
8-18 Pink M 20.0 Good
8-20 Pink F 18.0 Poor
8-22 Pink M 23.0 Spawned out
8-22 Pink F 19.0 Good
8-22 Silver ? Good
8-27 Pink M 17.0 Poor
8-27 Pink F 16.0 Poor
A-4
Table A-5. Backpack Electroshocker Catch Data for the Bradley
River, August 22-28, 1985.
Area # Fish
Sampled Observed # Fish Species
Date Location* (sq.ft.) (escaped) Captured Captured
8-22 ARR 3000 6 3 Pink salmon
8-23 ARR 3000 3 3 2 Pink & 1 churn salmon
8-23 EPR 2000 1 6 Pink salmon
8-24 MRR 2000 10 6 Pink salmon
8-25 MRR 2000 13 8 Pink salmon
8-25 DPN 1000 2 1 Pink salmon
8-25 ALT 2000 0 0
8-25 AUT 1000 0 0
8-26 MRR 2000 16 7 Pink salmon
8-26 DPN 1000 5 5 Pink salmon
8-26 AUT 1000 0 0
8-27 MRR 2000 12 5 Pink salmon
8-27 DPN 1000 6 4 Pink salmon
8-27 ALT 2000 0 0
8-28 MRR 2000 24 5 Pink salmon
8-28 DPN 1000 6 9 Pink salmon
8-28 EPR 2000 4 4 Pink salmon
TOTAL 108 66
* Key: ARR -Above Riffle Reach
EPR -Eagle Pool Reach
MRR -Mid Riffle Reach
DPN -Datapod Site, North Bank
ALT -Above Lower Trap
AUT -Above Upper Trap
A-5
Table A-6. Catch Statistics for Captured Salmon using Backpack
Electroshocker in the Riffle Reach Area of the
Bradley River, August 22-28, 1985.
Fork
Length
Date Species Sex ( in) Condition
8-22 Pink M 21.0 Good
8-22 Pink F 19.0 Good
8-22 Pink F 21.0 Good
8-23 Pink F 17.5 Good
8-23 Pink F 20.0 Good
8-23 Chum F 21.0 Spawned out
8-23 Pink F 18.0 Good
8-23 Pink F 18.5 Good
8-23 Pink F 18.5 Good
8-23 Pink F 19.5 Good
8-23 Pink F 21.0 Good
8-23 Pink M 20.0 Good
8-24 Pink F 19.5 Very Good
8-24 Pink F 18.5 Very Good
8-24 Pink F 19.0 Very Good
8-24 Pink F 21.5 Very Good
8-24 Pink F 19.5 Very Good
8-24 Pink M 19.0 Good
8-25 Pink F 20.5 Very Good
8-25 Pink F 21.0 Very Good
8-25 Pink F 19.0 Good
8-25 Pink F 20 .5 Very Good
8-25 Pink F 19.0 Good
8-25 Pink M 20.0 Very Good
8-25 Pink F 19.5 Very Good
8-25 Pink M 20 .o Good
8-25 Pink M 21.5 Very Good
A-6
Table A-6 (Cont'd). Catch Statistics for Captured Salmon using
Backpack Electroshocker in the Riffle Reach Area of
the Bradley River, August 22-28, 1985.
Fork
Length
Date Species Sex ( in) Condition
8-26 Pink M 19.5 Good
8-26 Pink M 20.0 Very Good
8-26 Pink M 22.0 Very Good
8-26 Pink M 19.0 Very Good
8-26 Pink F 20.0 Very Good
8-26 Pink F 18.5 Very Good
8-26 Pink M 22.5 Very Good
8-26 Pink F 19.0 Fair
8-26 Pink F 20.5 Fair
8-26 Pink M 18.5 Very Good
8-26 Pink F 18.5 Fair
8-26 Pink F 20.5 Very Good
8-27 Pink F 20.0 Very Good
8-27 Pink F 20.5 Fair
8-27 Pink M 20.0 Very Good
8-27 Pink M 22.0 Good
8-27 Pink M 19.5 Very Good
8-27 Pink F 19.0 Fair
8-27 Pink M 21.0 Fair
8-27 Pink M 20.0 Fair
8-27 Pink F 17.0 Spawned out
8-28 Pink M 21.0 Fair
8-28 Pink M 18.0 Good
8-28 Pink F 19.5 Very Good
8-28 Pink M 18.0 Good
8-28 Pink M 20.0 Good
A-7
Table A-6 { Cont 'd) • Catch Statistics for Captured Salmon using
Backpack Electroshocker in the Riffle Reach Area of the
Bradley River, August 22-28, 1985.
Fork
Length
Date Species Sex {in} Condition
8-28 Pink M 18.0 Fair
8-28 Pink M 20.0 Fair
8-28 Pink* F 18.5 Good
8-28 Pink F 19.5 Fair
8-28 Pink M 19.5 Very good
8-28 Pink M 20.5 Good
8-28 Pink F 21.0 Good
8-28 Pink F 17.5 Good
8-28 Pink M 20.0 Good
8-28 Pink F 19.0 Very good
8-28 Pink M 19.5 Good
8-28 Pink F 18.5 Very good
8-28 Pink F 20.0 Very good
* Recaptured (Tagged 8-26-85}
A-8
Table A-7. Surface Water Temperature Recorded during Lower
Bradley River Salmon Survey, August 1-28, 1985.
Date
08-02-85
08-04-85
08-06-85
08-07-85
08-11-85
08-12-85
08-23-85
08-24-85
08-25-85
08-26-85
08-27-85
08-28-85
08-29-85
Temperature (°C) Notes
8.6
9.4
9.4
11.7
7.4
12.8
12.9
13.3
13.5
13.6
13.5
13.8
Data collected with digital
thermometer
Data collected with digital
thermometer
Data collected with digital
thermometer
Thermometer malfunction
Mercury column separated on new
thermometer, data suspect
Mercury column separated on new
thermometer, data suspect
New mercury thermometer used
Checked against another new
mercury thermometer and found
reading to be 9.6°C. Suspect all
readings need to be adjusted down
4.2°C.
A-9
Table A-8. Incidental Harbor Seal Sightings in the Lower
Bradley River during Salmon Survey, August 1-28,
1985.
Number of
Date Location* Seals
08-11-85 Fox Farm Creek 1
08-13-85 Fox Farm Creek 1
08-16-85 Fox Farm Creek 1
08-16-85 Base camp 1
08-16-85 River mouth More than 120
08-18-85 Eagle Pool Reach/ 9
Riffle Reach
08-18-85 Base camp 1
08-19-85 Base camp 6
One observed with
salmon in mouth
08-20-85 Base camp 4
08-20-85 Fox Farm Creek 1
08-21-85 Base camp 9
08-22-85 Base camp 2
08-22-85 River mouth More than 325
08-23-85 Base camp 3
08-24-85 Base camp 1
08-25-85 Base camp 1
08-28-85 Base camp 5
08-29-85 Base camp 5
* Most sightings were near high tide, + 2 hours.
A-10