An Evaluation of Baron’s Pond and Recommendations to Establish a Family Fishery Chris Thornton...
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Transcript of An Evaluation of Baron’s Pond and Recommendations to Establish a Family Fishery Chris Thornton...
An Evaluation of Baron’s Pond and Recommendations to Establish a Family Fishery
Chris ThorntonBrien Knight
Christine MaxwellDan Nelson
ApproximateSampling Location
Islands
SAMPLING
• Bathymetry– Lowrance LCX-25C
GPS/sonar
• Secchi depth• Profiles– Temp, DO, Conductivity,
Irradiance– 0.5 m intervals– YSI 85 multi-meter &
LI-COR light meter
SAMPLING
• Chlorophyll a– Integrated sampler– Triplicate integrated
samples
• Total Phosphorous (TP)– Horizontal Van Dorn
sampler– Triplicate TP samples– 0.5m, 1.5 m, 2.5 m
BARON’S POND
• Area: 2921.4 m2 (≈ 0.72 acres)• Volume: 3468.7 m3
• Avg. Depth: 1.19 m • Max. Depth: 3.01 m
5.7 5.8 5.9 6 6.1 6.2 6.3 6.4 6.50
0.5
1
1.5
2
2.5
3
Temperature (°C)
Dep
th (m
)329 330 331 332 333 334 335 336 337 338 3390
0.5
1
1.5
2
2.5
3
Conductivity (uS)
Dep
th (m
)
5.5 6 6.5 7 7.5 8 8.50
0.5
1
1.5
2
2.5
3
Oxygen (mg/L)
Dep
th (m
)
0 5 10 15 20 25 30 35 400
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
Irradiance (umol)
Dep
th (m
)
PROFILES
Sample Chl aDepth (µg/L) Mean Std. Dev. Std. Err.
integrated 144.71integrated 146.48integrated 156.82 154.07 13.87 5.66integrated 143.11integrated 153.04integrated 180.29
CHLOROPHYLL a CONCENTRATION
175.00 180.00 185.00 190.00 195.00 200.00 205.000
0.5
1
1.5
2
2.5
3TP (µg/L)
Dep
th (m
)
TOTAL PHOSPHOROUS
RESULTS
• Secchi depth: 0.55 m• TP and Chl a concentrations high– Must control nutrient loading to manage fishery
properly
RECOMMENDATIONSFish Removal/Alternate Stable
State/Fish Stocking
• Remove all fish from pond using rotenone
• Manage for macrophytes• Stock fish (planktivores &
piscivores)
Fish Stocking/Biomanipulation
• Stock fish (planktivores & piscivores)
RECOMMENDATIONSFish Removal/Macrophyte Management/Fish Stocking
• Pros:– Proven to be more effective
at managing nutirents and trophic level biomass
– Removes “unwanted” fish species
– Long-term/stable solution
• Cons:– Time consuming– Labor intensive– More costly
Fish Stocking/Biomanipulation
• Pros:– Instant gratification
(ie. Instant fishing)– Relatively inexpensive
• Cons:– Not always a long term
strategy (maintenance required)
– Top-down impacts not very strong (reduction of algal biomass not likely)
FISH STOCKING
Bluegill (Lepomis macrochirus)Largemouth Bass (Micropteris
salmoides)
• Small individuals planktivorous
• Large individuals piscivorous
• Planktivorous
FISH STOCKING
Bluegill (Lepomis macrochirus)Largemouth Bass (Micropteris
salmoides)
• 50 – 100 fingerlings per acre in fall
• 2 pair (sexually mature) in spring after ice melt
• 4 pair of large individuals per acre in the spring
OR
OTHER RECOMMENDATIONS
• 5 m wide buffer of vegetation– Filter nutrients and sediment– Control erosion
OTHER RECOMMENDATIONS
• Pond aeration/circulation– Oxygenate water– Control internal loading of phosphorous– Prevent winter fish kills– Powered by solar or wind
OTHER RECOMMENDATIONS
• Improve habitat– Add woody debris, tree
stumps, X-mas trees– Add artificial structures
QUESTIONS??