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What is the optimum water temperature for my pond, and when should I worry that it’s too hot? | Decorative Ponds & Water Gardens Q & A

Q: What is the optimum water temperature for my pond, and when should I worry that it’s too hot?

Q: What is the optimum water temperature for my pond, and when should I worry that it’s too hot?

Gayle – Syracuse, NY

A: “Room temperature” isn’t just for humans. Fish and pond critters prefer particular underwater temperatures, too. In fact, and a high-temp living environment can even affect their health and well-being. Warm water holds less oxygen than cool water, so they’ll be literally gasping for breath if it gets too hot.

As the air temperature heats up this summer, the water temperature in your pond will increase, too, so it’s critical to keep an eye on it as the mercury rises. Use your Floating Pond Thermometer to test the waters. The best water temperature for your aquatic pals is between 68° and 74° Fahrenheit (pretty close to an ideal air temperature for humans).

If your thermometer tops 85°F, you’ll need to cool your water. Here’s what we recommend:

  • Add Aeration:Make sure you have your aeration system, like the Pond Logic® PondAir™ or KoiAir™ Aeration System, up and running. It’s like an underwater fan for your koi and goldfish. The moving, bubbling water is cooler and loaded with oxygen, making it easier for your fish to breathe.
  • Add Plants: Just as you seek out shady spots to shield yourself from the sun’s rays, fish will do the same to keep themselves cool. Make sure that about 60 percent of your pond’s surface is covered with floating plants, water lilies and other types of shade cover for your pond pets.
  • Add Water: Warmer temperatures mean increased evaporation rates, so make sure you top off your pond during hot weather. Doing so isn’t a substitute for a water change, but it will cool off the water and ensure your finned friends have enough wet stuff in their pond.

One last tip: Do not feed your fish when water temperatures are above 85°F. They probably won’t be hungry. And besides, the uneaten food will just ruin your water quality.

Pond Talk: What’s the hottest temperature you’ve recorded in your water garden?

Breathe Life Into Your Pond - Pond Logic(r) PondAir(tm) Aeration Kit

How do I know which chemicals will treat my weeds? | Ponds & Lakes Q&A

Q: How do I know which chemicals will treat my weeds?

Q: How do I know which chemicals will treat my weeds?

Henry – Markesan, WI

A: Weeds. Whether they’re algae or submerged, floating or shoreline plants, they’re a nuisance—not to mention a potential hazard to your game fish and pond or lake health. In order to manage these green invaders, you should get to know them a little better. Don’t worry: you don’t need to be a Master Gardener to identify and treat them. Here’s all you need to know:

1. Know the Weeds

Before you start dumping chemicals on the weeds in your pond, you’ll first need to understand the different types of aquatic weeds that pop up in lakes or ponds. There are four basic categories:

  • Algae. Algae comes in three basic types: Planktonic, which causes the pea soup look in your water; filamentous, which creates blankets of stringy stuff or pond scum; and chara or muskgrass, which smells like musky garlic. When you take a closer look, these weeds have no defined root systems, unlike their other weed cousins.
  • Submerged. Submerged weeds live underwater. This group of troublemakers includes bladderwort, several types of pondweed, watermilfoil, parrot feather and hydrilla. They look like a typical plant, with leaves, stems and root systems.
  • Floating. Floating weeds generally reside in shallow water and have root systems that reach into the water or down into the soil, allowing their leaves and flowers to rise to the surface. They include watermeal, duckweed, azolla and even water lilies. When not kept in check, these floaters can take over a pond in no time.
  • Emergent. Emergent weeds live along your lake’s shoreline. These plants like to keep their feet wet; their foliage, leaves and flowers live out of water, but their root systems prefer wet, almost completely saturated soil. Emergent weeds include cattails, phragmites, purple loosestrife and bulrush.

2. ID the Weed

Once you identify the category of weed you’re dealing with, head over to our Weed Control Guide and try to match weed with the picture. For example, is it a floating plant with a root system? Then you’re dealing with a type of floating weed. Is it completely submerged? Then you’re dealing with a type of submerged weed.

Each weed included in our Weed Control Guide will describe the best treatment options to manage it. Not sure of the weed? Snap a close-up photo and e-mail it to us at pondhelp@thepondguy.com. Of course, you can always call us toll-free for advice, too, at 866-POND-HELP (766-3435)!

3. Treat the Weed

Once you’ve ID’d the weed, treat it with its appropriate herbicide, remembering to always follow label instructions when applying it to your pond or lake. If you have fish in your pond, we suggest treating in sections as sudden changes in water conditions can affect aquatic species. Treat 1/4 – 1/2 of pond at a time, while waiting 10-14 days between treatments.

4. Remove the Remains

Once the chemicals start working to kill the weeds, make sure you remove the decomposing foliage with a weed rake, like the Jenlis WeedRazer® Aquatic Weed Cutter. Why? Because anything dead will turn into muck and start the weed/algae cycle again—which is not something you want to happen, right?

Pond Talk: What tips do you have for managing aquatic weeds?

Broad Spectrum Pondweed Control - Pond Logic® Ultra PondWeed Defense®

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