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I heard you can lose fish during the winter. How do I prevent a winter fish kill? | Ponds & Lakes Q&A

Q: I heard you can lose fish during the winter. How do I prevent a winter fish kill?

Q: I heard you can lose fish during the winter. How do I prevent a winter fish kill?

Jon – Little Suamico, WI

A: Imagine being cooped up all winter long in a room with no ventilation and no fresh air. Pretty claustrophobic, right? Now add the stench of decaying garbage and other waste buildup … it’s likely you wouldn’t last until spring.

It’s a similar situation with your fish.

In colder climates that freeze over the winter, decomposing vegetation and waste beneath the ice layer releases toxic gases that build up, displacing the oxygen that the fish need to survive. When that O2 is replaced with ammonia and other harmful gases, the result can be a winter fish kill.

So how to do you prevent this from happening? Aeration with an Airmax® Aeration System.

Open a Window!

An Airmax® Aeration System sized for your lake or pond moves the water below the frozen surface, which keeps an air hole open in the ice. This ventilation allows the harmful gases to escape while bringing in fresh oxygen for your fish. The aeration also injects oxygen into the water via the bubbles that come out of the diffuser or air stones.

Provide Year-Round Oxygen

For the health of your fish, we recommend you run an aeration system year-round—unless you plan to use the pond for winter activities, like ice skating or hockey, that require a solid and safe sheet of ice. In that case, follow the instructions in your product manual to safely turn off your system.

Create a Warm Zone

If you plan to run your system year-round, move the diffuser plates into shallower water during the winter months. This will allow your fish to hunker down in your pond’s warmer depth for the winter. It will also prevent the rare “super cooling” effect, in which the water temperature dips below freezing and over chills your fish.

Pond Talk: Have you ever experienced a winter fish kill? What changes did you make to prevent it from happening again?

Aerate Your Pond in All Seasons - Airmax® Pond Series™ Aeration

What should I do with my filter media during the winter? | Decorative Ponds & Water Gardens Q & A

Q: What should I do with my filter media during the winter?

Q: What should I do with my filter media during the winter?

Barb – Sterling, CO

A: Your pond’s filter media—the Matala® Filter Media Pads, The Pond Guy® BioBalls™ or Bio-Ribbon that house your beneficial bacteria—will need a little attention going into the winter. You won’t need your filter media during the cold months, but you should inspect it, clean it and purchase replacements parts before you start your water feature up again in the spring. Here’s a rundown of what to do:

Filter Media Pads: Pull out your filter media pads from your pond’s filtration system, waterfall box and skimmer, thoroughly rinse off the debris with your garden hose, and look for frayed edges, holes, large deposits of solid debris or other signs of damage. Plan to replace worn pads as necessary in the spring. You can choose from specially coated Matala® Filter Media Pads, which come in four different densities for your unique filtration needs, or cost-effective rolls of filter media that can be cut to fit and are ideal for waterfall boxes and skimmers.

BioBalls and Other Loose Filter Media: If you use secondary filtration, like The Pond Guy® BioBalls™, Bio-Ribbon, blocks or other loose filtration media that’s kept in a mesh bag, remove it all from your filter or waterfall box after you shut down your waterfall, rinse the bag and its contents thoroughly, and check the bag for holes or worn areas. Replace the bag if necessary in the spring.

After your filter media is rinsed and inspected, you can store them for winter in the filter, waterfall box or skimmer. The filter pads, BioBalls™ and other media will survive just fine outside, even in freezing temperatures. If desired, you can also remove them and stow them inside a garage or basement.

Pond Talk: How do you store your filtration media in the winter?

Four Densities for Every Filtration Need - Matala® Filter Media Pads

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