How to Keep Your Pond & Fish Safe During a Heat Wave

As we head into one of the hottest weeks of the year, your pond is under pressure—and so are your fish. While you may be able to retreat indoors and enjoy the air conditioning, your pond's ecosystem doesn’t get the same luxury.

During a heat wave, water temperatures rise dramatically, oxygen levels drop, and your fish can experience extreme stress or even death if preventative measures aren’t taken. At Prestige Illumination & Ponds LLC, we’re here to help you protect your pond—and the beautiful life it sustains.

Here are the top strategies we recommend to keep your pond cool, clear, and healthy during high heat:

1. Aeration, Aeration, Aeration!

Oxygen is vital to your pond's health, and warm water holds far less oxygen than cool water. That means your fish are struggling to breathe during heat waves—especially in the early morning hours when oxygen levels are at their lowest.

Here’s what you should do:

• Keep your waterfall or stream running 24/7 to circulate and oxygenate the water.

• If you don’t have a dedicated aerator, consider installing one now—it’s one of the best investments you can make for fish health.

• Perform daily checks to ensure your pump and filtration system are working properly. Even one day without circulation during extreme heat can be disastrous.

2. Provide Shade with Waterlilies & Pond Plants

Shade is more than a comfort feature—it’s a survival tool. When sunlight hits your pond directly all day, the water heats up fast. This not only raises the temperature but also encourages algae growth.

Waterlilies are a perfect natural solution.

• Their large, floating leaves block sunlight and reduce heat absorption.

• They give your fish a place to retreat when the sun is at its peak.

• And yes—they look absolutely stunning while doing it!

Right now, we have a fantastic selection of tropical waterlilies in stock, with huge lily pads capable of shading large areas of your pond. Come check them out or contact us for plant recommendations tailored to your pond’s size and sun exposure.

3. Do NOT Use Algaecide During High Heat

We never recommend algaecides for fish ponds as a first solution—but during a heat wave, they can be downright dangerous.

Here’s why:

• Algaecides cause algae to die off quickly, which then depletes oxygen as it breaks down.

• When your pond is already struggling with low oxygen levels, this can be a death sentence for your fish.

• Instead, control algae with natural methods: shade, proper filtration, and beneficial bacteria.

If algae is out of control and you’re not sure what to do, reach out to us. We’ll help you create a plan that’s safe, effective, and long-term.

Bonus Tip: Top Off with Caution

Evaporation happens quickly in the heat, and you may find yourself topping off your pond more frequently. Be sure to:

• Use dechlorinated water if you’re on city supply.

• Add water slowly to avoid shocking your fish.

• Monitor water parameters—rapid changes can be just as stressful as heat.

Keep Cool, Pond On

We know how much you love your pond—and how important your fish are to your outdoor oasis. These next few weeks could be rough, but with the right attention and support, your pond can weather the heat in style.

If you need help with aeration systems, plant additions, or a quick pond checkup, don’t hesitate to reach out. We’re happy to make recommendations or come out for a heat wave wellness visit.

Call Us

(240) 249-POND (7663) DC & Maryland

(434) 226-POND (7663) Virginia

(540) 272-6866 Main Office

www.prestigepond.com

Let’s keep your pond—and your finned friends—cool, safe, and thriving