2026-06-03 · Fish Farming
You cannot see it, but your fish feel it every minute. A gentle introduction to dissolved oxygen and the tools that support it.
Many first-time fish farmers put their energy into the fish and the feed, and rightly so. But a pond that looks calm can still be short of oxygen, and fish feel that long before we do.
Why oxygen can run low
Warm water holds less oxygen. Fish, plants and decaying feed all use it. At night, when plants stop producing oxygen, levels often reach their lowest point, usually before dawn.
Signs to watch for, kindly
- Fish gathering near the surface or inlet.
- Fish that eat less than usual.
- Cloudy or foul-smelling water.
None of these proves a problem on its own, but together they are a prompt to measure and to act.
Measure first
A water-quality meter for pH, dissolved oxygen and temperature turns guesswork into a record you can learn from. Measure at the same times each day, including early morning.
Ways to add oxygen
A blower with a diffused aeration kit is a common way to put fine bubbles into the water. The right size depends on pond volume, species and stocking level, so we recommend asking for advice rather than guessing. The products shown here are demonstration records until AQUAEE confirms specifications.
Feed with care
Uneaten feed uses up oxygen as it rots. Feed what the fish eat in a short time and adjust in hot weather.
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