NICO Blogs
Managing Oxygen Before Dawn in Indonesian Shrimp Ponds
An afternoon oxygen measurement can give a reassuring picture of a shrimp pond. Sunlight supports photosynthesis, and oxygen near the surface may be relatively high. Conditions can look very different several hours later, particularly when the pond carries substantial biomass and organic material.
At night, photosynthesis stops while respiration continues. Shrimp, plankton and microorganisms consume oxygen, and decomposing feed or waste adds further demand. This is why monitoring should capture the overnight period and the hours around dawn rather than rely on one convenient daytime reading.
Warm water makes the balance more demanding because it generally holds less dissolved oxygen than cooler water. Feeding, stock growth and accumulated solids also change demand during the production cycle. A treatment arrangement that appeared sufficient early in the cycle may need review as biomass increases.
Rain can alter temperature, salinity and mixing. The effect depends on the pond and event; rainfall should not automatically be treated as either beneficial or harmful. Record it alongside oxygen data so weather effects are not mistaken for treatment results.
A useful baseline includes measurements at representative locations and depths. Inlet areas, feeding zones and pond corners may not behave alike. Sensors require suitable positioning, cleaning and calibration. Operators should also log feeding, estimated biomass, existing aeration, water exchange and unusual events.
Nanobubble oxygenation can be evaluated as an additional oxygen-delivery tool. Air or oxygen is introduced through a compatible loop, with return points selected to reach the intended zone. Pump duty and circulation matter as much as gas generation. If paddlewheels or other equipment provide essential mixing, that function must be retained or replaced deliberately.
A pilot should define the minimum acceptable oxygen conditions, alarm thresholds, emergency response and comparison method before operation. Stock protection comes first. Avoid introducing an untested change across the whole farm without representative evidence and backup provision.
The objective is not simply to produce a high reading near the treatment outlet. It is to maintain suitable conditions where the animals are, through the periods of greatest demand. Growth, survival and feed-conversion improvements need their own evidence and cannot be inferred from oxygen measurements alone.
For Indonesian shrimp operators, the practical starting point is a clear overnight oxygen profile. That profile helps determine whether additional oxygenation is needed, where it should be delivered and how a trial can be evaluated responsibly.