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My fish population is growing rapidly, but how do I know if my fish population is balanced? | Ponds & Lakes Q&A


: My fish population is growing rapidly, but how do I know if my fish population is balanced?

Q: My fish population is growing rapidly, but how do I know if my fish population is balanced?

Dennis – Rock Island, IL

A: A balanced fish population in your pond is key for a healthy, thriving ecosystem. The best way to start figuring out your fish population is to know what you already have in your pond.

Start by sampling the population you already have by using a fish trap, or fishing out a sample population of fish and inspecting them for size and type.

Next, figure what might be needed to keep the population in check if something is out of balance. When sampling, if you notice you are only pulling out prey fish such as bluegill or perch, then your pond is either on the verge or already overpopulated with prey fish. To keep them in check, either fish out the prey fish or add more predators such as bass. Conversely, if you are only pulling out small bass, then your pond is in need of stocking prey fish.

If your pond is balanced, you should notice a population of fish relatively the same size, and the ideal ratio of about three prey fish to one predator fish.

When introducing the right balance, be sure there is a safe habitat for the fish, especially if you are introducing small fish with an already present population of larger fish. The Porcupine Fish Attractor Spheres are perfect for this. Release feeder minnows at one end of the pond to attract larger fish and introduce new, small fish at the other end or near a habitat so they have a chance to hide in the pond. Feeder minnows should be stocked every season as they provide good stock food for larger fish, and they reproduce quickly to maintain a living food source.

Pond Talk: How often do you check your predator:prey ratio in your pond?

Provide Refuge And Attract Fish - Porcupine Fish Attractors Spheres

4 Responses

  1. how many and what size Koi fish would be good for a water garden with 2 streams////skimmers and bio falls that is an average 2’deep

    • Hi Tom – How many gallons do you have? The rule of thumb is 200 gallons per koi. This gives the koi room to grow and thrive in your pond. Just remember that koi (like all fish) will reproduce. You will need to keep your population in check or increase your filtration.

  2. Are Koi predator or prey fish. Should I introduce bass into my Koi pond?

    • Hi Sandy – Typically you do not think of koi in terms of predator/prey relationships. Koi are considered ornamental fish. We do not recommend introducing bass to your koi pond. Koi populations can be controlled by giving them away or sometimes pet stores will do trades for baby fish. You can also increase your filtration in order to keep a heavier fish load.

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