fisheries management- ponds
TRANSCRIPT
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Restoring Balance. Enhancing Beauty.
Fisheries Management-Ponds
By: Vic DiCenzo, PhD
Certified Fisheries Biologist
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Outline
• Pond construction
• Goals for your pond
• Fish species
• Management strategies
• Fisheries
• Habitat
• Common pond problems
• Questions
Feel free to raise your hand and ask questions during the presentation
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New Pond Construction
Types of Ponds• Excavated
• Levee
• Embankment
Consult with your local Soil and Water Conservation District Office and/or
the Natural Resources Conservation Service
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Permitting
• Depending on the site, watershed size, and the purpose of the pond, local,
federal and state permits may be necessary for construction.
• Land-Disturbing Permit
• Stormwater Permit (Call 276-694-6094)
• Wetland and Stream Impacts (ACOE) and DEQ
• Dam Safety (DCR) Division of Dam Safety.
• Wildlife Impacts
Consult with your local Soil and Water Conservation District Office and/or
the Natural Resources Conservation Service FIRST
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Pond/Fisheries Management Goals
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What Is Fisheries Management?
Fisheries management
is a challenging and
exciting process of
planning and taking
actions to manipulate
fish populations,
habitat, and people to
achieve specific
human objectives.
Fish Habitat
Abundance
Growth
Condition
Water quality
Vegetation
Cover
Attitudes
Preferences
Satisfaction
People
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Desirable Fish Species
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Undesirable Fish Species
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Fisheries Management Sampling and Data Collection
Effective fisheries
management improves
when data about the
pond drives decisions
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Fisheries Management - Strategies
• Stocking
• Predator-to-Prey Management
• Species Management
• Supplemental Feeding
• Habitat Management
• Water quality
• Productivity
Effective fisheries management
requires planning and patience
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Stocking New Ponds - Fingerlings
Species Number/acre Length (inches) Time
Bluegill 350 1 Fall
Redear Sunfish 150 1 Fall
Channel Catfish 50 2 Fall
Largemouth
Bass
50 2 Following spring
Largemouth
Bass
50 2 Following spring
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Stocking New Ponds - Adults
Species Number/acre Length (inches) Time
Bluegill 100 ≥ 3 Spring
Redear Sunfish 25 ≥ 3 Spring
Channel Catfish 20 12 Spring
Largemouth
Bass
20 12 Spring
Golden Shiners ~5,000 4 Spring
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Stocking Ponds - Existing Fish Populations
• Proper species selection, rates, and sizes vary
based on current fishery status
• Information from an electrofishing survey provides
most accurate assessment
• Observations from angling can help
• Cannot blindly stock fish and expect
improvements to fishery
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Predator to Prey Management
• Annual assessments allow you to stay
one step ahead of potential
problems
• Innovative strategies for prevention:
- Stocking female-only Largemouth
Bass
- Diversify predator population
- Channel Catfish
- Hybrid Striped Bass- Tiger Muskie
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Species Management and Selection
• Annual water temperatures help
determine which predator species will best suit the waterbody.
• Once you have established what
predator species are desired, focus on the forage base.
• The right forage species depends
on water temperature, structure,
water movement, predator
species and future management techniques.
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Supplemental Feeding
• Establishing a self-sustaining forage
base is key to a successful fishery.
• Automatic feeders support forage base (trout and bass fisheries).
• Improved nutrition increases fish health and survival.
• Pellet fish feed is the most cost-
effective fisheries management
approach to growing big fish.
- Approximately two pounds of quality
fish feed will convert into one pound of fish growth.
• Increased catch rates (great for kids).
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Fish Habitat Management
• All aspects of fish habitat are important and beneficial when it comes to fisheries management.
• From vegetation and cover to water quality, it’s important to
take every aspect of your aquatic ecosystem into
consideration.
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Habitat Management
• Fish cover
• Aeration
• Aquatic vegetation
- Manage for beneficial native
plants
Control nuisance/invasive
vegetation
• Water quality
- Nutrient management
- Fertilization, Phosphorus Control
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Beneficial Aquatic Plants
• Aquatic plants may be submersed, floating, or emergent, and native species are essential to a healthy aquatic habitat.
• Beneficial plant species help absorb excess nutrients already in the pond, reducing availability for unwanted plants and algae.
• Provide habitat, refuge, and food for a wide variety of organisms
including fish, invertebrates, and waterfowl.
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Water Quality Testing and Restoration
• Proactive testing and monitoring is vital when it
comes to helping prevent water quality
problems.
• Helps to document annual trends and acts as
a reference for emerging water quality
impairments.
• On-site water quality consultations may include
information on the physical state of your water:
water color and odor, algae presence, pH,
temperature, dissolved oxygen, conductivity,
and alkalinity.
• In the lab, a deeper examination, also
measuring ammonia, nitrates, nitrites,
phosphates, hardness, iron, salinity and
conductivity can be performed. After
Before
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The Productivity of Your Pond
• The bottom of the food chain is
phytoplankton.
• Phytoplankton abundance is
related to nutrients – N and P.
• Generally the more nutrients, the
more productive the fishery.
• But, as water clarity is diminished,
algal blooms and aquatic plants
can become a nuisance, and fish
kills are more likely.After
Before
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Common Pond Problems
• Aquatic plants and algae
• Toxic algae
• Excessive nutrients
• Erosion
• Fish kills
• Undesirable fish
• Poor fishing
After
Before
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Aquatic Weed and Algae Control
• Invasive algae and aquatic weeds are not only unsightly, but they
can sometimes be a danger to aquatic life and humans depending on the species.
• Properly identifying the target algae and aquatic weeds is an important factor in achieving the desired results.
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Managing Toxic Algae
• Harmful Algal Blooms (HABs) like blue-green algae
can contain toxic cyanobacteria - and they are
becoming more prevalent in our communities year
after year.
• HABs can occur naturally, but have been a
problem for decades due to the negative
environmental impacts associated with mass urban
development and pollution.
• Proactive Management is the best solution:
• Correctly identify HABs
• Regularly test water quality
• Properly dispose of organic materials
• Reduce excess nutrients
• Introduce aeration
• Restore your shoreline
• Apply beneficial bacteria
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Managing Nutrients
Sources of Nutrient Pollution
• As ponds age, they naturally become more
productive
• Agricultural runoff
• Runoff from upstream of your property
• Lack of a buffer
Potential Solutions
• Modify agricultural practices
• Establish a buffer around the pond
• Aeration
• Chemical removal of nutrients
• Dredging
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Fish Kills
Identify factors that could
increase likelihood:
• Low dissolved oxygen
• Water chemistry
• Chemical toxicants
• Parasites and disease
• Thermal stress
Identify symptoms:
• <12” visibility due to
phytoplankton or
planktonic algae
• >50% of water volume is
filamentous algae or
aquatic vegetation
• Fish stop feeding
• Fish scatter when spooked
• Fish at the surface = DO
• Fish at the perimeter =
Ammonia, pH, etc.
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Undesirable Fish
Concerns• Compete for food and/or habitat
• Predation
• Impact water quality or habitat
• Unintended introduction from stocking
Solutions
• The larger the pond, the more
difficult to eradicate
• The sooner the better
• Is the source upstream (little
management control)
• Fish toxicants (restricted use)
• Removal – fish sampling/angling
• Stocking
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Poor Fishing
Observations• Poor catch rates
• Poor size – small/skinny fish
• Want a different species
Solutions
• Stocking blindly probably won’t fix it
• Need data!
• Stunting – slow growth = harvest
• Poor reproduction
• Unbalanced predator-prey ratio
• Poor habitat
• Poor water quality
• Stocking
• Feeding
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Final Thoughts
Fisheries management in ponds can be complex and affected by a
number of factors:
• Define goals
• What is the current status
• Plan – how do I achieve goals?• Assess – did I get there?
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Restoring Balance. Enhancing Beauty.
Please ShareYour Takeaways
By: Vic DiCenzo, PhDCertified Fisheries Biologist