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Milton webinar offers practical pond-management advice on stocking, dredging and aeration
Summary
City of Milton Ranger Jen Young hosted a Wildlife 101 webinar featuring pond-management expert Greg Grimes. The session covered pond clarity, fertilization, stocking plans, dredging, aeration, vegetation control and habitat for homeowners and managers.
Ranger Jen Young of the City of Milton opened a City of Milton Parks & Recreation webinar called "Wildlife 101" and invited residents to ask questions about ponds and small lakes in Milton.
The session featured lake-management consultant Greg Grimes, who told attendees that conventional ideas about “clear water” and stocking are often misleading. "The first myth is that I want my water to be really clear," Grimes said, adding that clearer water can mean low plankton production and lower fish yields. He described green-tinted water measured with a Secchi disk as often supporting far more fish than crystal-clear water.
The webinar aimed to give practical, locally relevant guidance to pond owners. Young, who said she connects Milton residents with outdoor recreation and manages the city’s environmental-education offerings, framed the session as a chance to answer frequently asked resident questions about personal ponds and the city’s small lakes.
Grimes discussed several common pond problems and remedies. On clarity and fertilization he warned that routine use of lake dye and improper fertilization can reduce plankton or encourage cyanobacteria, which can produce toxins. He recommended adding nutrients only when water temperatures and conditions support plankton growth, saying the team typically looks to begin fertilization when water temperatures reach about 55–60°F.
On sedimentation and shallow inlet coves, Grimes described how runoff and development deliver sand and organic matter that "take an area, making it shallower," reducing spawning habitat and encouraging vegetation. Remedial options he described include dredging, hydraulic pumping into containment bags, aeration systems to encourage bacterial breakdown of organic muck, and targeted bacterial products — though he cautioned that biological approaches take time and do not remove large volumes of sediment quickly.
Stocking and harvest were major topics. Grimes said modern stocking emphasizes a high-forage, lower-predator ratio (for example, thousands of bluegill per acre and far fewer bass than older plans). He warned that not harvesting enough predators can lead to stunted bass and recommended active harvest when a fishery is out of balance: "If you don't take that predator out... there's so much competition that the other fish are not going to grow," he said. He described cases where significant removals — on the order of tens of pounds of bass per acre over a management period — were needed to restore growth.
Grimes addressed specific species questions: threadfin shad and gizzard shad each have management tradeoffs; trout generally must be stocked seasonally in the region because summer temperatures and oxygen can be limiting; common carp can root vegetation and suppress recruitment of other species; and channel catfish are simple to manage because they typically do not recruit in many lakes. He also explained genetics briefly (northern, Florida and F1 bass) and said genetics matter but will not override poor habitat or water-quality conditions.
On habitat, Grimes recommended aiming for roughly 30% of a lake to contain some form of cover or spawning substrate for small fish and bluegill. He described artificial options (mossback structures, pyramid habitats, spawning gravel beds) and natural options (fallen trees, riprap), and he emphasized varying depths for spawning beds rather than placing all beds at one depth.
Aeration guidance distinguished bottom-diffused systems (which mix the water column and can cause problems if undersized) from surface aerators and fountains. Grimes cautioned owners against buying or installing aeration without consulting a biologist or professional: "Don't make your own aeration... There are a lot of myths, a lot of undersized systems, and you can cause more problems, with improper aeration than benefits," he said.
The webinar included live Q&A; Grimes and the panel recommended getting a professional fish-survey and hydrographic mapping before large investments in stocking or construction so owners have data-driven plans. Young closed by noting the session would be recorded and that the next webinar will cover beaver management.
Resources and contact information mentioned during the webinar included an email (office@lakework.com) and a reference to contacting Greg Grimes at Aquatic Environmental for services.
