RAS Technology

RAS Built on Biology and Engineering

Integrated RAS systems engineered for stable water quality, fish welfare, and reliable operation. We have expertise and experience in Freshwater and marine production, for cold water to warm and tropical species.

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Introduction

What is RAS?

RAS (Recirculating Aquaculture Systems) treat and reuse water to maintain stable conditions for fish, enabling controlled and efficient land-based production. This allows farmers to control water quality, reduce resource use, and improve production predictability.

RAS system diagram showing water treatment and fish tanks

The process

How RAS Works

RAS systems continuously treat and reuse water through a series of controlled processes, maintaining stable conditions for fish throughout the production cycle.

Fish tanks

Fish are grown in controlled tank environments designed for optimal water flow, stocking density and welfare. Tank geometry and hydraulics are engineered to support natural swimming behaviour and efficient waste removal.

Mechanical filtration

Solid waste and uneaten feed are removed from the water using drum filters or similar technology. This is the first step in maintaining water clarity and reducing the load on downstream treatment processes.

Biofiltration

Beneficial bacteria convert ammonia — a toxic byproduct of fish metabolism — into nitrite and then into less harmful nitrate. The biofilter is the biological heart of any RAS system.

Gas control

Carbon dioxide produced by the fish is stripped from the water, and oxygen levels are restored to optimal concentrations. Proper gas balance is critical for fish health and growth performance.

Polishing

<em>UV, protein skimming and ozone are used as polishing steps within the RAS loop to support stable water quality and fish health. These steps help reduce the microbial load, remove fine particles and dissolved organic compounds, and improve water clarity in the circulating process water.</em>

Recirculation

Clean, treated water is returned to the fish tanks, completing the loop. Typically 95–99% of the water is reused, dramatically reducing freshwater consumption compared to traditional aquaculture.

System performance

Designed for Stable Performance

But performance depends on more than process — it depends on how each part is designed and controlled.

  • Water Treatment

    Mechanical and biological filtration to maintain water quality and reduce waste.

  • Temperature Control

    Precise regulation tailored to species and growth stage.

  • Real-Time Monitoring

    Continuous tracking of oxygen, CO₂, pH and nitrogen levels.

  • Process Optimisation

    Data-driven system control balancing performance and efficiency.

Water quality

Water Quality at the Core

Water quality is the single most important factor in a recirculating aquaculture system. By combining proven treatment processes with advanced monitoring and control, we deliver reliable systems capable of supporting healthy fish at commercial scale.

Underwater view with bubbles and light

Building or upgrading a fish farm?

We help you design the right setup based on your facility, production goals, and conditions.

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Next steps

From RAS to real operations

Understanding RAS is only part of the solution. We help translate this technology into fully operational farms and integrated systems.

  • RAS facility interior

    Project overview

    Build and Upgrade Your Farm

    Design and deliver complete landbased facilities tailored to your production goals.

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  • Engineers monitoring RAS systems

    Project overview

    Operate with Confidence

    Monitor and manage daily operations with integrated systems and real time insight.

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