Blue Food and Climate: Oxygen and Water Quality Efficiency in Aquaculture
Introduction
Aquaculture is increasingly featured under the heading of “blue food” in climate and food security discussions. When the resource and emission impacts of different ways of producing animal protein are compared, aquaculture often comes up. But whether a facility actually delivers that advantage depends on the technical decisions made in daily operation.
This post looks at why oxygen and water quality management sit at the centre of those decisions and which choices make a difference to efficiency.
Oxygen: The Silent Determinant of Performance
When dissolved oxygen falls short, fish become stressed and feed conversion and growth suffer; in extreme cases, mortality occurs. Supplying oxygen sufficiently and stably is therefore a basic need for both fish health and efficiency. But oxygen is a cost item: the more it is used unnecessarily or inefficiently, the greater the loss of resources and energy.
Two Choices: Oxygen Source and Transfer Efficiency
The efficiency discussion comes down to two points: where the oxygen comes from, and how much of it actually dissolves into the water. The choice between a PSA oxygen generator, liquid oxygen, or a hybrid of the two varies with facility scale and continuity of demand; we detailed this in a separate post. Whichever source it comes from, poor diffusion or insufficient contact can let much of the oxygen escape at the water surface; the transfer equipment is therefore at least as important as the source.
Water Quality: Ozone in Recirculating Systems
Recirculating aquaculture systems (RAS), which treat and reuse most of their water, stand out for reducing water consumption; but they must manage fine particle, colour, nitrite, and pathogen build-up. Ozone can be used to control this build-up; but side-stream design, degassing, and ORP control are essential so that it does not harm fish and the biofilter. See our post on ozone in RAS for details.
An Honest Note: Energy Is Not Neutral
Recirculating systems that save water may require more pump, filter, and aeration energy. So the “blue food” advantage is not automatic: efficiently designed oxygen and ozone systems, avoiding unnecessary generation, and measurement-based control determine how large the advantage is.
Thinking About Oxygen and Ozone Together
Designing the oxygen generator and ozone generator together rather than as separate equipment allows the same oxygen source to serve both pond oxygenation and ozone generation, and process control to be managed from a single point. OCS AQUA PRIME, which we launched at Future Fish Eurasia 2026, is a product of that approach.
The OCS Ozone Approach
At OCS Ozone, we size the oxygen source, transfer equipment, and, where needed, ozone-based water quality management specifically for each aquaculture facility.
If you would like to assess oxygen and water quality efficiency at your facility, get in touch for a free technical assessment.