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Partially revolving fish farms

Technology between direct flow and RAS - we design and complete it according to your water source, type of fish and productivity. The share of water turnover and farm composition are calculated individually.

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15 years

in the industry

50+

launched farms

Short answer

Semi-recirculation fish farm is a fish farm format designed for a specific site, water source, production capacity and target market. The pool layout, water treatment, oxygen system, automation and auxiliary zones are calculated together, not selected as unrelated equipment. A semi-recirculation system reduces water use compared with flow-through farming while remaining simpler than a full RAS when site conditions are suitable.

Briefly about technology

What is a partial revolving farm?

This is the “middle ground” between direct flow and classic RAS: part of the water passes through the purification unit and returns to the pools, and part is constantly updated with fresh recharge and goes to waste. The system is more controllable and stable than a direct flow system, but is usually simpler and cheaper to operate than a fully closed RAS.

How it works

Growing pools→Water collection→Mechanical cleaning→Bioremediation (by load)→Degassing + oxygen→Return of part of the water · replenishment and discharge

What does partial turnover give?

Fewer requirements for water source

A significant part of the water is returned to circulation - there is no need for an “ocean” of water, as for direct flow.

Stable environment

Oxygen, water clarity and nitrogen cycle are better managed than in a straight-through system.

Flexibility in types and densities

The scheme is adapted for trout, sturgeon, catfish and other species - the configuration is selected by calculation.

Less dependent on the season

Fluctuations in temperature and flow rate of the source affect the farm less than with direct flow.

Requirements for the water source, acceptable types of fish, system operation logic, equipment and implementation stages are described in detail in the “Technology” section.

More about the technology →

What is included in the project

Composition of a partially revolving truss

The set of blocks depends on the type of fish, power and proportion of water turnover. A typical structure includes several functional units.

Water intake and water treatment

Water intake unit — and primary water treatment

Fish hatchery block

Pools, channels or tanks - for a specific type and age of fish
Thread distribution node — return / reset / recharge

Mechanical and biological treatment

Mechanical cleaning - drum filter or equivalent
Biofilter - if required by load calculation

Gas and oxygen mode

Aeration
Degassing — removal of CO₂
Oxygen make-up - according to the regime

Hydraulics and reset

Pumping, piping and fittings
Sludge collection and disposal unit
Wash waters - and preparation for reset

Engineering and support areas

Control panel and automation — sensors, emergency notification
Feed, water laboratory — sorting, preparing the batch for shipment

Partially revolving farm equipment

The list of equipment depends on the type of fish and the share of water turnover. Most often used:

Pools and canals

Drum filter

Biofilter

Aeration and oxygen

Oxygen station

Circulation pumps

Automation cabinet

Experience

Completed projects

"Aquafarmer" - 15 years in the industry and more than 50 launched farms, including partially revolving and adjacent farms.

Priozersk, Kazakhstan

Complex for raising trout fry

Chegem, Kabardino-Balkaria

Partially revolving farm for Caspian salmon and trout

Gallery of objects

All completed projects →

FAQ

Frequently asked questions

Clear answers to the questions that usually appear before a RAS fish farm project starts.

What is included in a turnkey semi-recirculation fish farm?

A typical scope includes technology design, tanks or pools, mechanical and biological filtration, pumps, oxygen supply, automation, piping, installation, commissioning and launch support.

Can the farm be adapted to an existing building?

Yes. Before design, the building is checked for area, height, floor loads, water supply, drainage, ventilation, power capacity and convenient equipment maintenance.

What data is needed to calculate the farm?

The first calculation needs the fish species, target capacity, growth stage, available site or building data, water analysis, climate conditions and investment range.

Application

We will select the share of turnover and composition of the farm to suit your task

The turnover percentage, treatment composition and feeding requirements are considered individually: fish type, temperature, planned biomass, feeding regime, input water quality and discharge conditions.

Water analysis — by season, with flow rate and temperature
Type of fish and power - target performance
Reset Conditions - where can the water be drained?

You may not know the exact parameters - a general understanding is enough, we will clarify the details during a call.

Calculate a partially revolving truss

Send data on water and the task - we will determine the optimal share of water circulation and calculate the technology, equipment composition and economics for your conditions.