Konawa Lake 5 year lake management plan

              KONAWA LAKE
5 YEAR
LAKE MANAGEMENT PLAN
OKLAHOMA DEPTMENT OF
WILDLIFE CONSERVATION
FISHERIES DIVISION
CENTRAL REGION
PREPARED BY: DANNY BOWEN
JUNE 1, 2010
Background
Konawa Lake impounds Jumper Creek 2 miles east of the city Konawa in Seminole
County, Oklahoma (Figure l). It covers 1350 surface acres. Construction began in 1968 and was
completed in 1970. The lake is owned by Oklahoma Gas and Electric Company. This lake
serves as the cooling water source for a gas-fired power generation station; therefore water
temperatures are higher year-round than in most other lakes in the state. The station has three
natural gas powered steam-turbine generators and a gas turbine generator producing
approximately 1,534 megawatts at peak output capacity. The station circulates 1,000,000 gallons
of lake water per minute through its’ cooling condensers when the three main generators are on-line.
Konawa Lake has a mean depth of 17 feet and a maximum depth of 49.8 feet, a shoreline
development ratio of 3.5, and a secchi disc visibility of around 37.4 inches in the main pool in
August. Turbidity is from plankton. The lake has a shoreline length of 20 miles and a storage
capacity of 23,000 acre-feet. It has large stretches of shoreline covered by cattails while most of
the remainder is eroded clay banks. Ten fish attractor sites consisting of artificial habitat
structures made from polyethylene pipe called “spider blocks” have been installed by the
Oklahoma Department of Wildlife Conservation (ODWC) recently. Normal pool elevation is 924
feet MSL (above Mean Sea Level). Lake levels are maintained by pumping water from the
nearby South Canadian River into settling ponds on the south side of the lake which are then
allowed to gravity flow into the lake. Fish habitat consists primarily of aquatic vegetation. The
dam is located at latitude N 340 57’ 42” and longitude W 960 42’ 6”.
The trophic state of the reservoir measured by the Oklahoma Water Resources Board
(OWRB) using Carlson’s Trophic State Index (TSI, chlorophyll-a) averaged 53 in 2005
indicating high levels of primary productivity and nutrients. The OWRB also found the lake to
be weakly stratified thermally during the late spring and summer months but was still considered
supporting the Fish and Wildlife Propagation (FWP) use for dissolved oxygen (DO) levels.
Salinity and specific conductivity levels (0.66-0.74 parts per thousand and 1234-1428
microsiemens per cubic centimeter, respectively) were both above the normal ranges found in
Oklahoma lakes. With pH levels ranging from 7.29-8.7 the lake was found to be neutral to
slightly alkaline. The OWRB also found the lake’s water clarity to be good to excellent
compared to other Oklahoma reservoirs.
Wind direction is primarily from the south to southeast with an average annual speed of
7.1 mph. Maximum gusts recorded in Seminole county were 55.8 mph and maximum sustained
winds were recorded at 35.5 mph. The winds and a fairly exposed shoreline contribute to the
eroded clay banks found around the lake.
A major change in the lake began in the late 1980’s when power generation at the plant
during the winter was reduced, leading to lower winter water temperatures which had a major
impact on the threadfin shad (Dorosoma petenense) and tilapia (Oreochromis aureus)
populations. The reduced survival of these prey species has had considerable impact on the
predator fish populations. Tilapia have not been collected in several years.
History of fishery
Major sport fish species present in Konawa Lake include largemouth bass (Micropterus
salmoides), white bass (Morone chrysops), striped bass x white bass hybrids (M. saxatilis x
M. chrysops) and channel catfish (Ictalurus punctatus).
For many years, the largemouth bass fishery in the lake has been characterized by high
abundance of all size-classes (Table 2). Konawa Lake regularly ranks at or near the top for
spring electrofishing catch rate among lakes over 1,000 acres surveyed by the ODWC. In the last
10 years, catch per hour (C/f) has declined from 228.9 in 2001 to 131.6 in 2006 but has been
more stable the last few years (Table 2, Figure 2).
Florida strain largemouth bass have been stocked in the lake since 1973 (Table 1). The
most recent electrophoresis results (2006) indicated 74% of the bass sampled during spring
electrofishing were pure Florida strain largemouth bass. It appears that the population has
become totally integrated as no pure northern strain bass have been collected in recent samples.
Konawa Lake has been managed as a trophy bass fishery since January 1, 1994. At that
time a 14-inch minimum length limit was changed to a 16-22 inch slot length limit and 6 bass per
day creel limit of which only one bass could be over 22 inches. This regulation was modified on
January 1, 2003 to 6 bass per day with no length limit except only one can be 22 inches or longer
due to stockpiling of bass 12 to 16 inches long and variable catch rates of trophy-size bass.
Largemouth Bass Virus (LMBV) was found in the lake in 2001 and unconfirmed reports
of bass dying were received from the public. There was a marked drop in the catch rate of trophy
bass following the disease outbreak. It has taken several years for it to recover to pre-LMBV
levels (Table 2).
White bass catch rates in gill netting at Konawa Lake have varied in recent years (Table
3). Catch per net set has ranged from a low of 4.3 (2002) to a high of 17.8 (2006) over the last
ten years. The catch per net set for quality-size white bass (>12 inches) has also been variable
during the same time period but overall has been above the minimum desired level (Table 3,
Figure 3).
Striped bass x white bass hybrids were first stocked in the lake in 1979 and were stocked
annually from 1988 through 2007 (Table 1). Over the last ten years, catch per net set has varied
from 2.4 in 2004 to 13.2 in 2000 and was 12.0 in the 2008 gillnet survey (Table 4). The catch per
net set for hybrids greater than 20 inches in length has remained at or above the minimum
acceptable catch rate for a quality fishery (0.48/net set; Table 4). Growth is good the first two
years of life, and then slows down when hybrids reach the size where they’re competing with the
stockpiled largemouth bass population. Growth improves again when they exceed the 17 to 20
inch size range (Table 5). A creel limit of 20 striped bass, striped bass x white bass hybrids,
and/or white bass per day of which only 5 may be >20 inches in length is in effect to prevent
over-harvest. The hybrid fishery is good overall and the catch rate for trophy-size hybrids has
been steadily improving since 2004 (Figure 4).
Channel catfish catch rates in gill netting at Konawa Lake continue to be high for all size
classes (Table 6, Figure 5). The catch per net set for quality-size individuals (>16 inches) in 2008
gill netting (8.16/ net set) was more than six times the minimum acceptable rate for a quality
fishery (>1.2/net set; Table 5).
Flathead catfish (Pylodictis olivaris) are present in the lake at very low population levels.
Very few have been collected in gill netting (Table 7, Figure 6).
Crappie (Pomoxis spp.) had virtually disappeared from this lake in past years, probably
due to elevated water temperatures. However, a few have been collected in recent surveys
perhaps because of lower water temperatures due to a decrease in power generation (Table 8,
Figure 7).
The abundance of threadfin shad in the lake has decreased since the 1980’s due to lower
winter water temperatures from reduced wintertime power generation. This has impacted all the
predatory fish species in the lake. During the 1970’s and 1980’s the threadfin were so abundant
that the ODWC used Konawa Lake as a source for threadfin shad brooders to stock in other
waters of the state. Due to the reduction in threadfin shad abundance and the fact that LMBV
was found in the lake, Konawa Lake is no longer used for this purpose. It is not known if LMBV
can be carried by threadfin shad or can be transported in hauling water, but the risks outweighed
the benefits and the transport of Konawa threadfin shad to other reservoirs was discontinued.
Threats to fishery
• Aquatic Nuisance Species (ANS) – Zebra mussels (Dreissena polymorpha) and quagga
mussels (Dreissena rostiformis bugensis) can be transported on boats and trailers moving
from infested waters. Konawa is a popular winter time fishery due to warmer water
temperatures from power generation and an abundant bass population. Anglers from
around the state traveling to the lake pose a significant risk of transporting these
organisms unless precautions are taken.
Silver carp (Hypophthalmichthys molitrix), bighead carp (Aristichthys nobilis) and grass
carp (Ctenopharyngodon idella) also represent potential problems as water levels in the
lake are maintained by water pumped in from the nearby South Canadian river. Grass
carp have been found in Eufaula Lake, approximately 83 miles downstream. Tilapia were
a problem in the lake during the 1980’s but have not been collected during subsequent
sampling.
Golden algae (Prymnesium parvum) is another threat that has caused large fish kills in
Lake Texoma and several reservoirs in Texas. It has been found in the South Canadian
river downstream of Lake Meredith in the Texas panhandle. Konawa Lake’s water
conditions are very similar to lakes that have had outbreaks.
Eurasian water milfoil (Myriophyllum spicatum) is found in the lake but has not become a
nuisance, being outcompeted in most areas by native species. However, hydrilla
(Hydrilla verticillata) has been found in nearby Arbuckle Lake, and is considered a very
real threat to Konawa Lake through boat and/or trailer introduction from anglers who fish
weekly jackpot tournaments at both lakes.
• Economics – The high productivity of Konawa Lake is due in large part to the use of its
water to cool the Seminole Power Plant. Economic factors that might cause a shutdown
or scaling back of electric generation at this facility, like high wintertime natural gas
costs, will have serious impacts on the fishery, particularly as it affects the threadfin shad
which are the main food base for the lake’s predator fish populations.
Management Objectives
Sampling goals by species
• Largemouth bass – Maintain the catch rate for largemouth bass at or above 130/hr with a
catch rate of bass >21 inches exceeding 3/hr.
• Conduct spring electrofishing surveys at least bi-annually to monitor progress. Collect age
and growth data and evaluate Florida largemouth bass stocking success by collecting fish
periodically for genetic analysis.
• White bass - Continue periodic monitoring of the white bass population with gillnetting
surveys and collect age and growth data.
• Striped bass x white bass hybrids – Maintain a reduced total catch rate of 2.0/gillnet set and
conduct netting surveys every 2-3 years to monitor stocking success and to collect age and
growth information. Adjust stocking frequency and/or rate if necessary to maintain
satisfactory predator growth rates.
• Channel catfish - Maintain a catch rate of 4.8/net set of gill netting and conduct gillnetting
surveys every 3-5 years to monitor population status.
Strategies to achieve sampling goals
1. Stockings
• Continue alternate or every third year stockings of Florida-strain largemouth bass to maintain
a high percentage of pure Florida largemouth bass in the bass population.
• Reduce stockings of striped bass x white bass hybrids to every three to four years to reduce
competitive interactions with largemouth bass and improve growth rates for both hybrids and
largemouth.
2. Surveys
• Monitor the largemouth bass population with bi-annual electrofishing surveys collecting
samples for genetic evaluation and age and growth data.
• Monitor the striped bass x white bass hybrid population with periodic gill netting and collect
age and growth information.
• Conduct shad gill netting to evaluate the forage base in the lake and its effects on the
predator fish populations.
3. Habitat improvement
• Continue constructing fish attractor sites on the lake using spider blocks.
• Consult with OG&E, the lake’s owner, about the possibility of conducting an aquatic
vegetation management project to improve forage availability and predator species’ growth
rates.
4. Regulations
• Maintain the current creel limit of 6 bass/day with only one over 22 inches in length. If
necessary, make adjustments to these regulations to improve the size structure of the
population to achieve desired catch rates for different size-classes of bass.
• Maintain the current creel limit of 20 striped bass, striped bass x white bass hybrids and
white bass combined per day of which only 5 can be >20 inches in length and, if necessary,
make adjustments to the regulation to better manage the population.
Table 1. Species, number and size of fish stocked in Konawa Lake, 1988 - 2007.
DATE SPECIES NUMBER SIZE
1988 Striped bass hybrid 16,540 fingerlings
Intergrade Florida LMB 27,186 fingerlings
1989 Certified Florida LMB 30,000 fingerlings
Striped bass hybrid 13,000 fingerlings
1990 Striped bass hybrid 14,000 fingerlings
Certified Florida LMB 32,105 fingerlings
1991 Striped bass hybrid 13,590 fingerlings
Certified Florida LMB 7,000 fingerlings
1992 Striped bass hybrid 13,600 fingerlings
1993 Striped bass hybrid 13,500 fingerlings
1994 Certified Florida LMB 3,080 fingerlings
Striped bass hybrid 13,750 fingerlings
1995 Certified Florida LMB 27,000 fingerlings
Striped bass hybrid 13,500 fingerlings
1996 Certified Florida LMB 27,000 fingerlings
Striped bass hybrid 16,000 fingerlings
1997 Certified Florida LMB 26,860 fingerlings
Striped bass hybrid 13,500 fingerlings
1998 Florida LMB 28,416 fingerlings
Striped bass hybrid 13,650 fingerlings
1999 Florida LMB 27,600 fingerlings
Striped bass hybrid 14,400 fingerlings
2000 Florida LMB 27,400 fingerlings
Striped bass hybrid 15,000 fingerlings
2001 Florida LMB 27,405 fingerlings
Striped bass hybrid 13,805 fingerlings
2002 Striped bass hybrid 15,000 fingerlings
2003 Florida LMB 27,040 fingerlings
Striped bass hybrid 15,625 fingerlings
2004 Striped bass hybrid 14,400 fingerlings
2005 Florida LMB 26,560 fingerlings
Striped bass hybrid 14,620 fingerlings
Blue catfish 6,336 fingerlings
2007 Striped bass hybrid 13,950 fingerlings
Table 2. Total number (No.), catch rates (C/f), and relative weights (Wr) by size groups of
largemouth bass collected by spring electrofishing from Konawa Lake (VVP 1980-1988; GPP
1989-2009). Numbers in parentheses represent acceptable C/f values for a quality fishery.
Acceptable Wr values are 90.
Total <8 8-12 12 14 21
inches inches inches inches inches
(40) (15-45) (15-30) (15) (10) (2)
Year No. C/f C/f Wr C/f Wr C/f Wr C/f Wr C/f Wr
1981 128 42.7 10.7 84 14.7 84 17.3 91 6.7 --
1985 176 54.2 3.4 83 24.6 88 26.2 88 16.3 --
1987 357 89.3 5.7 93 31.2 92 52.2 87 19.2 89 3.0 95
1988 316 90.3 3.4 93 14.9 87 72.0 85 24.9 84 0.6 76
1989 555 170.8 20.3 105 36.6 96 113.8 93 56.3 93 2.8 99
1990 545 218.0 19.2 77 48.0 90 150.8 87 55.2 86 2.4 97
1991 447 162.5 41.1 89 28.4 89 93.1 85 33.5 85 1.5 103
1992 417 208.5 37.5 83 72.0 87 99.0 86 33.5 84 0.0 --
1993 424 242.3 62.9 92 49.7 90 129.7 88 49.7 87 1.7 96
1994 449 224.5 30.5 96 26.5 90 167.5 85 82.5 84 4.5 89
1995 684 210.5 35.4 89 51.1 86 124.0 83 46.5 81 0.6 94
1996 317 211.3 20.7 80 35.3 83 155.3 85 78.0 84 5.3 95
1997 511 185.8 13.8 81 19.6 88 152.4 85 93.5 84 2.9 88
1998 414 207.0 37.0 84 35.0 85 135.0 83 81.0 81 2.0 92
1999 447 198.7 60.0 79 38.2 83 100.4 84 53.8 84 1.3 82
2000 376 188.0 41.0 87 22.0 92 125.0 84 83.5 83 5.0 85
2001 515 228.9 64.4 90 65.3 88 99.1 86 45.8 84 0.9 91
2002 471 209.3 49.8 84 54.2 90 105.3 85 41.8 84 0.9 83
2003 905 201.1 34.9 91 26.0 89 140.7 86 54.7 83 0.2 85
2004 763 169.6 32.4 91 43.8 93 94.4 89 43.3 88 0.2 90
2005 640 150.6 37.4 93 23.3 94 90.4 88 33.4 86 0.2 108
2006 592 131.6 15.8 93 29.8 95 86.9 95 48.4 94 0.2 96
2007 834 185.3 29.5 94 32.4 96 123.3 88 69.1 86 2.2 89
2008 441 155.5 34.9 -- 57.5 -- 64.1 -- 27.2 -- 0.0 --
2009 701 155.8 8.9 95 17.1 96 129.8 92 69.8 89 2.0 61
Table 3. Total number (No.), catch rates (C/f), and relative weights (Wr) by size groups of white
bass collected by gill netting from Konawa Lake. Numbers in parentheses represent acceptable
C/f values for a quality fishery. Acceptable Wr values are 90.
Total <8 inches 8-12 inches 12 inches
(4.8) (1.2) (1.3-7.2) (2.4)
________________________________________________________________
Year No. C/f C/f Wr C/f Wr C/f Wr
1978 50 5.28 .00 -- 1.2 4.08
1979 68 12.96 .00 -- 2.64 10.32
1981 29 5.52 .00 -- 1.44 4.08
1982 29 5.52 .00 -- .00 -- 5.52 96
1984 22 4.32 .00 -- 0.72 111 3.36 108
1985 73 13.44 0.48 98 11.28 97 2.16 97
1986 45 9.12 .00 -- 1.92 96 6.96 99
1987 43 8.4 .00 -- 0.96 106 7.44 99
1988 10 2.16 .00 -- .00 -- 2.16 113
1989 12 2.4 .00 -- 0.24 117 2.16 101
1990 17 3.36 .00 -- 2.16 103 1.2 91
1991 20 4.08 .00 -- 1.44 104 2.64 101
1992 11 2.16 .00 -- 1.68 105 0.72 101
1993 23 4.56 .00 -- 0.72 113 4.08 101
1994 63 12.72 .00 -- 0.72 89 12.0 88
1995 56 13.92 5.52 84 3.6 78 5.04 84
1996 19 4.32 0.24 88 .00 -- 4.08 91
1998 49 11.04 1.44 71 5.04 78 4.8 82
2000 31 7.2 .00 -- 0.24 98 6.96 97
2002 21 4.32 .00 -- 2.16 88 1.92 88
2004 55 6.24 0.96 73 3.6 88 1.68 83
2006 145 17.76 0.24 89 4.32 89 13.2 88
2008 54 6.0 .00 -- 2.16 100 3.84 99
Table 4. Total number (No.), catch rates (C/f), and relative weights (Wr) by size groups of
striped bass x white bass hybrids collected by gill netting from Konawa Lake. Numbers in
parentheses represent acceptable C/f values for a quality fishery. Acceptable Wr values are 90.
Total <12 inches 12-20 inches 20 inches
(2.4) (0.72) (1.2) (0.48)
________________________________________________________________
Year No. C/f C/f Wr C/f Wr C/f Wr
1979 4 0.72 .00 -- 0.72 .00 --
1981 7 1.44 .00 -- 0.48 0.96
1982 0 .00 .00 -- .00 -- .00 --
1984 29 5.52 2.88 93 2.64 92 .00 --
1985 45 8.64 4.08 87 4.56 91 .00 --
1986 56 11.28 1.2 89 8.88 91 1.2 86
1987 14 2.64 .00 -- 2.64 92 0.24 85
1988 15 3.36 1.44 102 0.48 102 1.68 98
1989 5 0.96 0.24 106 0.72 98 .00 --
1990 12 2.4 1.68 97 0.72 91 .00 --
1991 11 2.16 .00 -- 2.16 95 .00 --
1992 31 6.0 3.12 98 2.64 97 0.48 95
1993 29 5.76 0.48 97 4.32 95 0.72 87
1994 14 2.88 0.24 86 1.68 92 0.96 75
1995 12 3.12 1.92 76 0.96 80 .00 --
1996 16 3.6 0.48 101 2.88 90 0.48 91
1998 55 12.48 0.96 75 10.56 78 0.96 91
2000 57 13.2 6.72 97 5.76 90 0.72 78
2002 39 7.92 1.2 105 5.76 83 0.72 75
2004 20 2.4 0.72 76 1.2 79 0.48 75
2006 62 7.44 0.24 92 6.48 86 0.96 81
2008 108 12.0 3.36 97 7.2 95 1.44 85
Table 5. Mean length (inches) at age of striped bass hybrids collected by gill netting from
Konawa Lake.
_________________________________________________________________
Year Age 0 Age 1 Age 2 Age 3 Age 4 Age 5
______________________________________________________________
2002 9.5 13.9 17.0 18.9 20.5 24.0
Table 6. Total number (No.), catch rates (C/f), and relative weights (Wr) by size groups of
channel catfish collected by gill netting from Konawa Lake. Numbers in parentheses represent
acceptable C/f values for a quality fishery. Acceptable Wr values are 90.
Total <12 inches 12 inches 16 inches
(4.8) (2.4) (2.4) (1.2)
________________________________________________________________
Year No. C/f C/f Wr C/f Wr C/f Wr
1979 92 17.76 7.92 9.84 5.76
1981 61 11.52 4.8 4.8 1.2
1982 83 15.84 8.4 89 7.44 87 2.4 104
1984 102 19.68 11.04 92 8.64 81 1.92 94
1985 75 14.4 12.72 95 1.68 98 0.48 116
1986 77 15.6 13.68 74 1.92 90 0.24 135
1987 42 8.16 7.68 87 0.48 87 0.24 104
1988 203 45.84 22.8 86 23.04 87 2.88 100
1989 76 14.88 7.92 83 6.72 88 1.68 95
1990 68 13.44 7.44 81 6.0 84 2.16 93
1991 81 16.32 13.2 81 3.12 90 1.68 101
1992 67 13.2 6.96 83 6.24 85 2.4 92
1993 48 9.6 4.56 82 5.04 84 1.68 93
1994 55 11.04 4.32 78 6.72 82 3.36 87
1995 56 13.92 3.36 79 10.8 80 1.68 86
1996 81 18.72 5.04 81 13.68 83 5.04 88
1998 78 17.76 6.48 71 11.04 79 5.04 86
2000 78 18.0 9.84 82 8.16 81 3.36 86
2002 130 25.92 13.44 79 12.72 82 8.16 85
2004 154 17.04 6.0 77 11.04 81 4.08 86
2006 114 13.68 0.24 83 13.44 84 5.28 90
2008 199 22.08 9.6 82 12.24 83 8.16 84
Table 7. Total number (No.), catch rates (C/f), and relative weights (Wr) by size groups of
flathead catfish collected by gill netting from Konawa Lake . Acceptable Wr values are 90.
Total <12 12 20 24 28
inches inches inches inches inches
________________________________________________________________
Year No. C/f C/f W r C/f Wr C/f Wr C/f Wr C/f Wr
1978 3 .01
1981 1 .01
1982 2 .02
1984 2 .02 .01 -- .01 99 .01 99 .00 -- .00 --
1985 1 .01 .00 -- .01 107 .01 107 .00 -- .00 --
1986 0 .00 .00 -- .00 -- .00 -- .00 -- .00 --
1987 1 .01 .00 -- .01 94 .01 94 .00 -- .00 --
1988 0 .00 .00 -- .00 -- .00 -- .00 -- .00 --
1989 0 .00 .00 -- .00 -- .00 -- .00 -- .00 --
1990 3 .03 .00 -- .02 88 .02 85 .01 89 .00 --
1991 1 .01 .00 -- .01 86 .01 86 .01 86 .00 --
1992 2 .02 .00 -- .02 94 .02 94 .01 87 .00 --
1993 0 .00 .00 -- .00 -- .00 -- .00 -- .00 --
1994 3 .02 .00 -- .02 115 .02 115 .02 115 .02 114
1995 0 .00 .00 -- .00 -- .00 -- .00 -- .00 --
1996 5 .05 .00 -- .05 88 .05 88 .03 83 .02 83
1998 1 .01 .00 -- .01 89 .01 89 .01 89 .00 --
2000 0 .00 .00 -- .00 -- .00 -- .00 -- .00 --
2002 4 .03 .00 -- .03 86 .03 86 .02 82 .01 88
2004 4 .02 .00 -- .02 81 .02 81 .02 81 .01 83
2006 0 .00 .00 -- .00 -- .00 -- .00 -- .00 --
2008 3 .01 .00 -- .01 99 .01 92 .00 -- .00 --
Table 8. Total number (No.), catch rates (C/f), and relative weights (Wr) by size groups of
crappie collected by gill netting from Konawa Lake. Numbers in parentheses represent
acceptable C/f values for a quality fishery. Acceptable Wr values are 90.
Total <8 inches 8inches 10 inches
(4.8) (1.2-7.2) (1.92) (0.96)
________________________________________________________________
Year No. C/f C/f Wr C/f Wr C/f Wr
1978 3 0.24
1979 1 0.24
1981 0 0.00
1982 0 0.00
1984 0 0.00
1985 0 0.00
1986 0 0.00
1987 0 0.00
1988 0 0.00
1989 1 0.24 0.00 -- 0.24 119 0.24 119
1990 0 0.00
1991 2 0.48 .00 -- 0.48 111 0.48 111
1992 2 0.48 0.24 126 0.24 119 0.00 --
1993 4 0.72 0.00 -- 0.72 110 0.72 110
1994 1 0.24 0.00 -- 0.24 106 0.24 106
1995 2 0.48 0.00 -- 0.48 97 0.24 95
1996 4 0.96 0.00 -- 0.96 114 0.72 115
1998 0 0.00
2000 1 0.24 0.00 -- 0.24 115 0.24 115
2002 0 0.00
2004 1 0.24 0.00 -- 0.24 102 0.00 --
2006 1 0.24 0.00 -- 0.24 101 0.24 101
2008 3 0.24 0.00 -- 0.24 111 0.24 111
Table 9. Total number (No.), catch rates (C/f), and relative weights (Wr) by size groups of
gizzard shad collected by spring electrofishing (VVP 1980-1988; GPP 1989-2008), gill netting,
and seining from Konawa Lake. Numbers in parentheses represent acceptable C/f values for a
quality fishery. Acceptable Wr values are 90.
Spring Electrofishing Gill Netting Seining
Total <8 inches Total <8 inches Age 0
(40) (20) (4.8) (2.4) -
Year No. C/f C/f Wr No. C/f C/f Wr No. C/f
1985 16 7.1 2.2 107 23 4.32 1.44 107 0 .00
1986 49 9.84 7.92 94 1 .09
1987 19 4.7 2.7 107 84 16.32 5.76 -- 0 .00
1988 16 4.6 2.0 115 25 5.76 1.2 82 0 .00
1989 64 19.7 .6 107 51 9.84 0.48 89 0 .00
1990 9 4.0 2.2 -- 45 8.88 0.48 101 0 .00
1991 37 13.5 5.5 84 61 12.24 0.48 85 0 .00
1992 108 61.7 8.0 84 35 6.96 .00 --
1993 44 29.3 16.0 85 50 10.08 3.84 --
1994 6 4.8 0.0 -- 42 8.4 0.24 90
1995 47 15.7 0.0 -- 78 19.44 5.52 95
1996 0 0.0 0.0 -- 61 14.16 1.92 99
1997 6 4.0 0.0 --
1998 4 2.0 0.0 -- 77 17.52 2.88 86
1999 15 6.7 0.0 --
2000 16 12.8 0.0 -- 78 18.0 2.64 82
2001 127 63.5 0.0 --
2002 123 164.0 0.0 -- 32 6.48 0.24 --
2004 53 6.0 .00 --
2006 250 30.24 12.96 --
2008 100 11.04 0.72 --
Table 10. Total number (No.) and catch rates (C/f) of threadfin shad and silversides collected
by spring electrofishing (VVP 1980-1988; GPP 1989-2008), gill netting, and seining from
Konawa Lake.
Threadfin shad Silversides
Total1 Total2 Total3 Total3
Year No. C/f No. C/f No. C/f No. C/f
1985 196 87.1 0 .00 1 .09 1518 130.9
1986 0 .00 0 .00 3029 261.1
1987 200 50.0 4 0.72 0 .00 8034 692.6
1988 50 14.3 0 .00 0 .00 2841 244.9
1989 685 210.8 0 .00 6 .52 7028 605.9
1990 200 88.9 5 0.96 0 .00 3394 292.6
1991 60 21.8 7 1.44 0 .00 7020 605.2
1992 5 2.9 8 1.68
1993 91 60.7 9 1.92
1994 119 95.2 0 .00
1995 206 68.7 104 25.92
1996 91 72.8 3 0.72
1997 1077 718.0
1998 50 25.0 118 26.64
1999 19 8.4
2000 137 109.6
2001 165 82.5
2002 162 216.0 2 0.48
2004 50 5.04
2006 543 65.28
2008 16 1.92
1 Spring electrofishing
2 Gill netting
3 Seining
Figure 1. Konawa Lake
Figure 2. Largemouth bass catch per hour (C/f) by electrofishing in Konawa Lake 1989 – 2009.
0
50
100
150
200
250
300
1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
Year
Catch per hour (C/f)
Total >14" <8"
0
2
4
6
8
10
12
14
16
18
20
1978 1979 1981 1982 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1998 2000 2002 2004 2006 2008
Year
Catch per net set (C/f)
Total <8" >12"
Figure 3. White bass catch per net set (C/f) in Konawa Lake 1978 – 2008.
0
2
4
6
8
10
12
14
1979 1981 1982 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1998 2000 2002 2004 2006 2008
Year
Catch per net set (C/f)
Total <12" >20"
Figure 4. Striped bass x white bass hybrid catch per net set (C/f) in Konawa Lake 1979 – 2008.
0
5
10
15
20
25
30
35
40
45
50
1979 1981 1982 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1998 2000 2002 2004 2006 2008
Year
Catch per net set (C/f)
Total <12" >16"
Figure 5. Channel catfish catch per net set (C/f) in Konawa Lake 1979 – 2008.
0
0.01
0.02
0.03
0.04
0.05
0.06
1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1998 2000 2002 2004 2006 2008
Year
Catch per net set (C/f)
Total <12" >20"
Figure 6. Flathead catfish catch per net set (C/f) in Konawa Lake 1984 – 2008.
0
0.2
0.4
0.6
0.8
1
1.2
1989 1990 1991 1992 1993 1994 1995 1996 1998 2000 2002 2004 2006 2008
Year
Catch per net set (C/f)
Total <8" >10"
Figure 7. White crappie catch per net set (C/f) in Konawa Lake 1989 – 2008.
Konawa
"!
39
"!
39
"!
99
"!
99
(/ 377
(/
377
Gillneting
Gillnetting
Gillnetting
Gillnet ting
Gillnetting
Electro
Electro
Electro
Electro
Electro
Electro
Electro
Electro
N
W E
S
Konawa Lake sampling sites
Figure 8. Sampling sites on Konawa Lake.