Recreational Pond Management - Marine Aquaculture...•Pond management –Basic management...
Transcript of Recreational Pond Management - Marine Aquaculture...•Pond management –Basic management...
Recreational Fishpond Management Enhancements to basic approaches
Rusty Wright, Extension Fisheries Specialist
Auburn University
Alabama Extension
Pond Management
Why are ponds important?
•Huge numbers of ponds • More than 2.6 million on private land in the U.S.
• More than 200,000 in AL
• More than 50,000 in stocked by AL DWFF
•Potentially influence many species and
landscapes • New habitat
• Altering hydrology
• Altering microclimates
•Recreation and Economic Impacts
•Build it right.
•Eliminate wild fish.
•Stock it by the numbers.
•Maintain fertility.
•Keep out the weeds.
•Harvest, harvest, harvest!
The Basic Principles
Managing for balance
• Sustainable harvest of bass and bluegill
• Good fish growth
• Good quality fishing
Stock it by the numbers
Keep it simple! Stock only largemouth bass, bluegill,
and redear sunfish.
Largemouth Bass
Bluegill
Zooplankton & Insects
Algae
JuvenileLargemouth Bass
Nutrients (N,P) Sunlight
• A fertilized pond will support 300-400
lb/acre (kg/ha) of fish vs 100 lb/acre
(kg/ha) for an unfertilized pond
• Fertilization can help control weeds
To fertilize or not to fertilize that
is the question?
pros
Nutrients fuel the food web.
Largemouth Bass
Bluegill
Zooplankton & Insects
Algae
JuvenileLargemouth Bass
Nutrients (N,P) Sunlight
To fertilize or not to fertilize that
is the question?
cons
• A fertilized pond requires 20-25 lb/acre
(kg/ha) of bass be harvested per year vs
10 lb/acre (kg/ha) for an unfertilized pond
• Fertilization can cause weed problems
• Expense
Beyond Balance
Taking a pond to “the next level”
Norm Haley1, Rusty Wright1, Dennis DeVries1, and
Mike Allen2
Privately-owned small
impoundments of central Alabama:
a survey and evaluation of management
techniques and enhancements
North American Journal of Fisheries Management
32:1180-1190, November 2012
1Auburn University, 2University of Florida
• Alabama’s Black Belt – 17 counties
– Fertile prairie soils
– Meager economy
• Small impoundments – >200,000 in Alabama
– Multiple uses
• Alabama anglers – ~ 850,000
– Over $1 billion of economic impact
• Pond management – Basic management techniques
• Fertilization
• Liming
• Balanced harvest
• Weed control
– Enhancements
• Pellet feeding
• Supplemental forage
• Genetic strains
• Harvest extremes
• Exceptional ponds – Trophy size fish, enhanced catch rates, or instances of both
– Pay-to-fish or leased properties
– Sport fishing resorts
Survey Methods
• Pond owner survey
– 23 counties
– 12 ponds per county randomly selected using map sources
– Owner information gathered from county courthouses
– Owners contacted by telephone
Pond Use
recr
eational fi
shing
livesto
ck
aesthetic
s
no use
s
irrigatio
n
leased
fire fig
hting
aquacultu
re
wildlife
pay-to-fi
sh
Fre
qu
en
cy (
#)
0
10
20
30
40
100
110
120
(111)
(32)
(25)
(9)(7) (6)
(4) (3) (3) (2)
Species Stocked
largem
outh b
ass
bream
redear
bluegill
coppern
ose
catfis
h
grass
carp
crappie
other
no fish st
ocked
thre
adfin sh
ad
minnows
Fre
qu
en
cy (
#)
0
10
20
30
40
50
60
70
80
90
100
110
120(111)
(97)
(24) (23)
(13)
(56)
(35)
(8)(3)(5)(8)
(10)
Management Strategy
• 76% of owners
are satisfied with
the condition of
their pond
General balance
No management
Trophy bass
Trophy bass & bream
Enhanced catch rates
Aquaculture
Pond Management Information Sources
Primary Sources
Friends and Family 27
County / Regional Extension 25
No information used 21
ADCNR 15
Auburn University 14
Private Pond Consultant 8
Local Feed Store 5
Extension / University Website 4
Other Internet Sites 4
Other 4
Personal Knowledge 3
Outdoor Magazines 2
Additional Survey Results
• 51% never checked for balance or water
quality
• 93% did not keep harvest records
– Slow LMB growth most commonly reported
problem
Techniques and Enhancements
• 48% Fertilized (66% by clarity)
• 45% Applied supplemental pellet feed
• 12% Stocked supplemental forage
– 33% reported stocking threadfin shad
Field Assessment
• Sample ponds that are currently
managed with different approaches
Assessment Methods
ponds were selected based on the following
minimum qualifications:
– Stocked for ≥ 5yrs.
– 5-50 acres
– Contain largemouth bass and bream
Management Strategies Assessed
• Ponds were classified by management
strategy
– Unmanaged
– Fertilized
– Fertilized & Feed: ≥ 1 pellet feeder for
every 5 acres
– Fertilized & Threadfin Shad
– Fertilized, Threadfin Shad, & Feed
Assessment Methods
• Three 15 minute pulsed
DC electrofishing
transects
• Four quadrat seine hauls
• Primary Production
– Chlorophyll a & zooplankton
• Abiotic Collection
– Alkalinity & hardness
– Secchi transparency
– Turbidity
– Temperature & DO profiles
Assessment Results
Proportional Size Distribution
PSD = Number of fish >= quality length
Number of fish >= stock length
For largemouth bass stock length = 8 in (200 mm)
and quality length = 12 in (300 mm)
For bluegill stock length = 3 in (80 mm) and quality
length = 6 in (150 mm)
PSD- Preferred
PSD-P= Number of fish >= Preferred
Number of fish >= stock length
For largemouth bass stock length = 8 in (200 mm) and
preferred length = 15 in (380 mm)
Ranges for PSD and PSD-P,M in
Balanced Ponds
Species PSD PSD-P PSD-M
Bluegill 20-40 5-20 0-10
LMB 40-70 10-40 0-10
Largemouth Bass PSD vs. PSD-P
• PSD did not accurately convey largemouth
bass population states
– General over estimation of population states
– Quality length (300 mm) - too small to predict
bass crowded systems
• PSD-P
– Preferred length (380 mm) - a better predictor
of largemouth bass population state
Bluegill PSD
0 10 20 30 40 50 60 70 80 90 100
La
rge
mo
uth
Ba
ss P
SD
-P
0
10
20
30
40
50
60
70
80
90
100
Stock Density Indices (PSD/PSD-P)
Balanced
Bluegill
Crowded
Transitional State
Trophy State
Artificially Maintained
Largemouth Bass
Crowded Low Fertility
Competing Species
Foraging Difficulty
Bluegill PSD
0 10 20 30 40 50 60 70 80 90 100
La
rge
mo
uth
Ba
ss P
SD
-P
0
10
20
30
40
50
60
70
80
90
100
Unmanaged 2007
Unmanaged 2008
Unmanaged Stock Indices
Bluegill PSD
0 10 20 30 40 50 60 70 80 90 100
Larg
em
outh
Bass P
SD
-P
0
10
20
30
40
50
60
70
80
90
100
Fertilized 2007
Fertilized 2008
Fertilized Stock Indices
Bluegill PSD
0 10 20 30 40 50 60 70 80 90 100
Larg
em
outh
Bass P
SD
-P
0
10
20
30
40
50
60
70
80
90
100
Fertilized and Feeder 2007
Fertilized and Feeder 2008
Fertilized & Feeder Stock Indices
Bluegill PSD
0 10 20 30 40 50 60 70 80 90 100
Larg
em
outh
Bass P
SD
-P
0
10
20
30
40
50
60
70
80
90
100
Fertilized and Shad 2007
Fertilized and Shad 2008
Fertilized & Shad Stock Indices
Bluegill PSD
0 10 20 30 40 50 60 70 80 90 100
Larg
em
outh
Ba
ss P
SD
-P
0
10
20
30
40
50
60
70
80
90
100
Fertilized, Shad, and Feeder 2007
Fertilized, Shad, and Feeder 2008
Fertilized, Shad, & Feeder Stock Indices
Stock
Quality
Preferred
Memorable
AA
AAB
B
Bluegill
Unmanaged
Fertilized
Fertilized & Feed
Fertilized & Shad
Fert., Shad, &
Feed
Log C
PU
E (
#/h
r)
0.0
0.5
1.0
1.5
2.0
2.5
3.0Stock
A AAB
BC
C
Stock
Quality
AA
AA
B
Stock
Quality
Preferred
AA
AA
B
Electrofishing catch rate of bluegill
Largemouth Bass
Unmanaged
Fertilized
Fertilized & Feed
Fertilized & Shad
Fert., Shad, &
Feed
Log
CP
UE
(#/h
r)
0.0
0.3
0.6
0.9
1.2
1.5
1.8
2.1
2.4
2.7Stock
A A
B
ABAB
Stock
Quality
AAB
BC
DCD
Stock
Quality
Preferred
AA
BCB
C
Stock
Quality
Preferred
Memorable
AA
AB
BB
Electrofishing catch rate of bass
Relative weight
Unmanaged
Fertilized
Fertilized & Feeder
Fertilized & Shad
Fert., Shad, &
Feed
A
AB
BC
CC
Largemouth Bass
Unmanaged
Fertilized
Fertilized & Feeder
Fertilized & Shad
Fert., Shad, &
Feed
Mean R
ela
tive W
eig
ht
(Wr)
80
82
84
86
88
90
92
Bluegill
Conclusions - Pond Owner Survey
• Majority of ponds served as recreational fishing for largemouth bass and bream – Only 7% of ponds were fee fishing / leased
– Fertilizer, pellet feed, and threadfin shad were popular enhancements
• General balance was a strong focus
– Majority of owners were satisfied with their ponds
• Slow largemouth bass growth biggest obstacle
• Very few owners (7%) are keeping harvest records
Conclusions – Field Assessment
• Population characteristics varied greatly
among and within management types
• PSD-P was more sensitive to largemouth
bass population states than PSD
• Owner management goals were rarely
attained
Conclusions – Field Assessment
• Threadfin shad – Positive effect on largemouth bass:
• Length-freq. dist., stock indices, CPUE, condition, growth
– May help to prolong or maintain balanced or quality largemouth bass populations
– Little evidence of neg. impact on bluegill pop. characteristics
• Supplemental pellet feed – Variation within treatment (amount and rate) limits
assessment
Management Implications • Education remains important
• Stocking threadfin shad can improve the largemouth bass population characteristics without strong negative impacts on bluegill
• Pellet feeding may hold potential for increasing the number of quality and larger sized bream
Management Implications
NO MAGIC BULLETT!!!
•Ecosystems have limits
•Ponds could still be bass-crowded with
shad
On-going research
• Recently completed feeding experiments
• Currently using a combination of feeding
experiments, field survey, and stable
isotope analysis to determine foodweb
effects of pellet feeding
Acknowledgements Funding:
• Alabama Agricultural Initiative
• Alabama Cooperative Extension
System
• Alabama Agricultural Experiment
Station
Dr. Michael Allen
The University of Florida
Department of Fisheries and Aquatic Sciences
My current recommendations
for forage enhancement
Forage enhancement for bream
Feed 1 to 10 lb. of floating pelleted catfish
feed per acre per day during the growing
season. Be careful not to overfertilize in
combination with the feed.
Feeding will reduce the effectiveness of
grass carp.
Will pellet-feeding the bluegill
enhance growth and reproduction in
largemouth bass?
STAY TUNED!
What NOT to use as a forage
enhancement for redear
sunfish (shellcrackers)
Corbicula
Forage enhancement for bass
• Temporary
• Sustainable –based on production
• Trophy only
Temporary Forage
Red swamp
crayfish
Fathead minnows
Partially Sustainable
Nile Tilapia, Oreochromis niloticus
Tilapia only where it is legal: check
with your local natural resource
agency. Must be restocked annually in
areas where winter water Temp < 50 F
Sustainable
Threadfin shad, good for ponds 7 – 8 acres
(3-4 ha) or larger. Will winterkill at water
temp. <40 F. Does compete with bream but
may not cause serious reduction.
Golden Shiner, Notemigonus crysoleucas
1. Golden shiners are difficult to
maintain without weeds. Bass
tend to eliminate them through
time.
2. Golden shiners are egg and
larvae predators at high density
Trophy only
Forage enhancement for bass
•Stock threadfin shad in larger ponds.
Shad will compete
with bream, so
expect reduced
bream catches.
MAYBE NOT!
A well-managed pond will provide many
years of enjoyment with catch rates
unequaled in our public reservoirs!
Russell Wright, Extension Fisheries Specialist, Alabama Cooperative Extension System, Auburn University
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