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How do I know how many fish I can have in my pond? | Decorative Ponds & Water Gardens Q & A

Q: How do I know how many fish I can have in my pond?

Q: How do I know how many fish I can have in my pond?

Lynn – Leitchfield, KY

A: Fish are like potato chips: It’s hard to have just one. When you visit your local pet retailer or water garden center and see those goldfish and koi staring up at you through the water, how can you not take them home!

Too many fish in a pond, however, can create an unhealthy environment for your fish and a breeding ground for algae. The more fish you have, the more waste they produce – and that waste can turn into algae fertilizer unless you have the filtration power to pump it out.

Before you start buying bucket-loads of finned friends, figure out how many you can comfortably keep in your pond. Here’s how in five simple steps.

1. Calculate Pond Size

First, determine the square footage of your pond’s surface area by measuring its length and its width, and multiplying the two numbers. We recommend no more than 1 inch of fish for every square foot of surface area, so if your pond is 250 square feet, that’s a maximum of 250 inches of adult, fully grown fish. If you need help with the math, use our online calculator. You’ll just need to know your pond’s length, width and average depth.

2. Allow Room to Grow

If you’re starting with young or adolescent fish, don’t max out your fish volume right from the start. Remember that those little guys will grow – a 2 inch fry will turn into a 10 inch adult in no time – and they’ll produce more waste as they develop. Skip the guessing game of growing fish by stocking adults, such as those included in our koi packages. You’ll enjoy instant gratification and a pond full of colorful fish!

3. Add More Slowly

Whether you’re starting with young fish or adults, add just a handful at a time. Your pond will need time to “season,” or build up its biological filtration system (a.k.a. beneficial bacteria), to handle the new influx of fish waste. Introduce a few fish, and then wait several weeks before adding more. While you’re waiting, give your biological filter a boost with DefensePAC® Pond Care Package. It contains Nature’s Defense®, Clarity Defense® and Muck Defense® – all of which promote the growth of those beneficial microorganisms.

4. Keep Up with Routine Maintenance

Once your fish have moved in, help them feel right at home. Use natural bacteria to break down fish waste, uneaten food and other debris. Provide shade, habitat and safety with floating and submerged aquatic plants. Feed them a healthy diet, like The Pond Guy® Staple Fish Food, which has the right amount of protein to keep them healthy without producing a lot of excess waste. Provide a healthy ecosystem and tasty food, and you’ll have a pond full of happy fish!

5. Share – or Upgrade!

If your pond is overpopulated already, you have two options: Share some of your fish with a friend (or two!), or do some upgrades in either your filtration system or your pond itself.

A external pressurized filter like the AllClear™ PLUS can handle excess waste, thanks to its powerful combination of biological, mechanical and ultraviolet filters. Its backflush option makes it easy to clean, and it’s easy to install in an existing pond because the plumbing doesn’t need to be run through the liner.

Or if you want to upgrade your entire water feature, check out one of our all-inclusive Pond Kits. Available in several different sizes, they contain a pump, pressurized filter or waterfall filter, pond liner, underlayment, plumbing, foam, hardware and beneficial bacteria to jump-start your biological filtration. All you’ll need to add is fish!

Pond Talk: What’s your most memorable experience with a fish overpopulation problem?

Balanced Diet For Everyday Feeding - Pond Logic® DefensePAC®

How Many Fish Can I Have? – Water Garden Q & A

Picture of a School of Fish

Q: How many fish can I have in my water garden? -Several Customers

A: There are many rules of thumbs out there regarding how many fish you can have in your water garden. Just remember, the old saying goes, “The more animals in the barn, the more doo doo to clean up.” With that said, if you have the number of fish that the picture to the left has…my guess is that you have algae! Below I am going to explain the 4-Key Factors in Maintaining a Clean, Clear & Healthy Pond Ecosystem. The way these factors work is this: If you plan to increase your fish load, then you must improve the other 3 to help compensate. Hopefully this helps!

1. The DefensePAC®:
The products included in the DefensePAC® provides beneficial bacteria, trace minerals, and a fish and plant safe pond cleaner. The DefensePAC works to breakdown fish waste, leaves or other organics that accumulate in the pond. These are essential to maintain a clean, clear and healthy ecosystem.

2. Fish Load:
When calculating your fish load think of it in pounds of fish or total inches. For example, one 6” fish can weigh as much as four 4” fish. The number of fish will affect the overall fish load, although 10 small fish may only produce the waste of one large fish. With this said, remember that your fish are growing and in many cases multiplying. Always plan for the future and be careful not to overstock your pond.

3. Proper Filtration:
The size and type of your filtration system will depend on your total fish load. If your filter is not properly sized for max potential, your fish will outgrow the filter. In most cases filters on the market are rated for ponds containing no fish or a minimal fish load. It is always best to get a filter that is rated for at least 2x the water volume of your pond.

4. Aquatic Plants:
A simple rule of thumb is to have 60% plant coverage. This should consist of submerged, floating and marginal plants. Floating plants, such as Water Hyacinths, pull their nutrients directly from the water. Rooted plants, such as water lilies and marginal plants, create a great place for your fish to hide from predators. Please note when aquatic plants are not present, algae will take their place.

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