How much oxygen do fish consume?

Typical $\text{O}_2$ consumption rates: tilapia 0.3–0.5 g/kg/hr, salmon 0.4–0.6 g/kg/hr. Rates increase with temperature, feeding activity, and stress.

What types of aerators are available?

Common types include paddle wheels (ponds), air blowers with diffusers (tanks), venturi injectors, and pure oxygen systems. Each has different transfer efficiency.

How do I calculate aerator capacity?

Aerator capacity is rated in g $\text{O}_2$/hr under standard conditions. A typical 1 HP paddle wheel delivers 40–60 g $\text{O}_2$/hr. This tool assumes 50 g/hr per unit as a planning baseline.

ToolsConductScience tool

AquacultureFree in-browser calculator

Aeration Requirement Calculator.

Calculate the aeration capacity needed for your tank based on biomass and oxygen demand. Includes aerator count estimate.

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Validated2026-04-08

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Aeration Parameters

Biomass (kg)

O\u2082 Consumption (g/kg/h)

Desired DO Increase (mg/L)

Tank Volume (L)

Results

O\u2082 Demand

200.0 g/hr

biological demand

Capacity Needed

220.0 g/hr

total aeration

Aerators

units needed (~50 g/hr each)

Biomass

500 kg

total fish

When to use

Sizing aeration equipment for new tanks or ponds
Planning for biomass increases as fish grow
Emergency aeration capacity planning
Comparing aerator options

Do not use for

As an exact engineering specification — consult manufacturer ratings for specific aerator models

Temperature affects both sides

Higher temperature increases fish $\text{O}_2$ consumption AND decreases water $\text{O}_2$ holding capacity. Size aeration for worst-case summer conditions.

Safety margin

Always add 20–30% safety margin above calculated requirements to handle peak feeding, hot days, and equipment downtime.

Method

$\text{O}_2$ demand = biomass $\times$ consumption rate. Aeration capacity = $\text{O}_2$ demand + (DO increase $\times$ volume / 1000). Aerator count at 50 g/hr per unit (typical 1 HP paddle wheel).

Validated

Last validated 2026-04-08. Calculations are designed for planning and documentation support; verify procurement decisions against manufacturer specifications or institutional SOPs.

How to cite

How to Cite

ConductScience Aeration Requirement Calculator (v1.0). ConductScience, Inc. 2026. Available at: https://conductscience.com/tools/aeration-requirement-calculator

Boyd CE. Water Quality in Warmwater Fish Ponds. Auburn University. 1990.

Aeration in Aquaculture

Adequate aeration is critical to maintaining dissolved oxygen above safe thresholds. Oxygen demand comes from two sources: fish respiration (proportional to biomass) and the need to maintain a target DO concentration in the water volume. Under-sizing aeration is the most common cause of oxygen-related fish kills.

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