Simple definition: Overstocking is keeping more fish, by weight, than a pond’s filtration and aeration can support.
Detailed Explanation
It’s rarely a single bad decision. Most overstocking happens gradually, as healthy fish grow past the biomass the pond was originally set up for.
Why It Matters
Overstocking is one of the most common root causes behind ammonia spikes, low oxygen events, and chronic cloudy water, even when every individual piece of equipment is working correctly.
Practical Example
A pond that ran fine for a year can start showing problems purely because the same fish grew, not because anything was added.
