Every summer, fish farmers brace themselves. Sustained high temperature raises water temperature and breaks the balance of the pond environment, while sharply increasing oxygen consumption — in bad cases ending in a total die-off, "turning the pond." When long heat waves alternate with heavy regional rain, many farms suffer a double blow from nature, and oxygen-starvation crashes are one of the leading causes of loss.
Why does hot weather and heavy rain cause oxygen deficiency?
1. Oxygen solubility falls as temperature rises. At higher water temperature and lower air pressure, less oxygen dissolves in water — the whole pond simply holds less. Long summer heat makes low DO a standing problem that almost always needs mechanical aeration.
2. Warmth increases biological oxygen demand. Higher temperature makes fish more active, but it also multiplies aerobic microbes that consume large amounts of oxygen. In densely stocked ponds the oxygen decline can be visible day by day.
3. Prolonged cloudy and rainy periods slow photosynthesis. When overcast weather follows heat, algae and other plants cannot photosynthesize, so the oxygen they would produce is lost on top of everything else.
Pond oxygen deficiency is easily triggered by outside factors, and once oxygen is short the losses can be huge. That is why experienced farmers keep their ponds in a high-DO state all season: it covers the oxygen the stock needs and builds a buffer against sudden events.
Achieving a high-DO environment: aerate the bottom
Most aquaculture water has plenty of oxygen at the surface but little at the bottom — yet the bottom is where most oxygen is consumed and demanded. That contradiction is why more and more farmers aerate from below.
Bottom aeration means installing aeration discs on the pond floor and driving them with a roots blower through a main pipe, self-sinking line and disc distributors. Air rises from the bottom to the surface, lifting the low-oxygen bottom water and raising DO where it is most needed, while normal water circulation keeps oxygen balanced through the whole pond. The result is efficient oxygenation with less energy than surface equipment alone.
Keep DO stable all summer — not just at the surface, but at the bottom where your fish actually live. Tell us your pond area, average depth and stocking density and we will recommend the blower and disc layout within 24 hours.
