RAS· Sep 2026·10 min read

From RAS Sizing to RAS Cost: The Workflow

Scale model of a RAS building beside sizing charts

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Part 2 of the RAS cost and sizing series. RAS sizing and RAS system cost are the same exercise run in sequence. Cost estimates produced before sizing are benchmarks applied to a guess; estimates produced after sizing are budgets. The tools below follow the sequence exactly.

Step 1 — Production target to standing biomass

Annual tonnes, harvest weight, cycle length, survival and FCR give peak standing biomass. Use the biomass calculator if the growth model is not fixed yet.

Step 2 — Standing biomass to feed load

Daily feed at peak biomass is the master variable behind oxygen demand, TAN production and solids load. Roughly 30 g of TAN per kg of 32% protein feed, and 0.4-0.6 kg of oxygen per kg of feed, are the planning constants.

Step 3 — Feed load to flow, filtration and oxygen

Density limits give tank volume; turnover rate of 0.75-1.5 volumes per hour gives recirculation flow. Run it in the RAS sizing calculator and check reuse assumptions with the RAS water turnover calculator.

Step 4 — Sized scope to cost

Only now does a cost estimate mean anything. Price the resulting scope in the RAS system cost calculator, then test the result against your farm-gate price in the RAS feasibility calculator.

Step 5 — Cost to comparable bids

Suppliers quote different scope boundaries. Normalise them against the sized packages with the RAS bid normalizer before comparing headline prices.

The whole path, with checklists, sits in the RAS planning hub. When the numbers are ready, a human-reviewed RFQ turns them into a procurement-ready brief.

Key figures

Figures quoted in this guide. Indicative planning numbers — supplier quotes confirm final values.
Figure	Value	Context
Size / capacity	30 g	Roughly 30 g of TAN per kg of 32% protein feed, and 0.
Size / capacity	6 kg	6 kg of oxygen per kg of feed, are the planning constants.

RASPond to RAS Transition: When It Pays, Why It Fails and How to StartDecision checks for moving an existing pond farm to RAS, the six common failure causes, a worked biofilter and oxygen sizing example with labeled assumptions, and a transparent payback formula.RASRAS Ammonia or Nitrite Spike: How to Find the Cause and Protect the StockStep-by-step troubleshooting for ammonia and nitrite rises in an operating RAS: first actions, a cause-by-cause check table, design vs operating problems and the records to keep.RASRAS vs flow-through: 2026 economics for fish farmsCapex, opex and water cost — a frank look at when RAS pays back versus traditional flow-through raceways and cages.RASRAS System Cost per Tonne: What Drives the NumberWhy RAS system cost lands between roughly USD 9,000 and 25,000 per tonne of annual capacity, and which four design decisions move it most.

Where this fits in a real project

Every FishMatch project runs through the same five reviewed stages, from a first enquiry to comparable quotations. See the full buyer journey.

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Before you request quotes

Costs & budgeting

How much does a commercial fish farm cost to build?

Budget ranges depend on system type, not on country alone. Pond and cage projects are usually the lowest capital per tonne of annual output, while recirculating (RAS) projects carry the highest equipment and energy share because filtration, oxygenation and backup power are mandatory. Reliable numbers come from a sized bill of quantities — species, target tonnage, water source and grow-out temperature — not from a generic price list. Use the FishMatch calculators to size the project, then submit an RFQ so quotes are priced against the same specification.

What drives the price differences between aquaculture equipment quotes?

Most spread between quotes comes from scope, not from margin: included spares, installation and commissioning, control and automation level, materials (HDPE vs steel vs FRP), certification and testing, delivery terms (EXW vs CIF) and warranty length. Two quotes are only comparable when they answer the same specification. A structured RFQ fixes the scope so differences reflect real engineering choices.

What operating costs should a business plan include?

Feed is normally the largest recurring cost, followed by energy (highest in RAS), labour, fingerlings or post-larvae, health management, water treatment consumables and maintenance. Financing cost and working capital for the first production cycle are frequently underestimated. FishMatch cost tools separate CAPEX from OPEX so the payback assumption is visible rather than implied.

Equipment scope

What equipment does a commercial aquaculture project actually need?

A grow-out project typically needs holding infrastructure (tanks, ponds or cages), water movement (pumps, piping, valves), aeration or oxygenation, water treatment appropriate to the system, feeding equipment, grading and handling gear, monitoring and alarms, and backup power. RAS adds mechanical filtration, biofiltration, degassing, disinfection and tighter process control. Hatchery and processing scopes are specified separately.

Which equipment should be specified before requesting quotes?

Specify the items whose sizing changes everything downstream: design biomass and stocking density, water exchange or recirculation rate, oxygen demand at peak temperature, and installed pumping head. With those four fixed, suppliers can quote aeration, filtration, pumps and power on the same basis. FishMatch calculators produce these figures and attach them to the RFQ.

Can equipment be sourced in stages?

Yes, and phased procurement is common. The usual sequence is water supply and holding infrastructure, then aeration and treatment, then automation and monitoring, then processing and cold chain. Staging works when interfaces and capacity headroom are defined at the start; otherwise later phases force replacement rather than addition.

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