RAS aquaculture systems: components, sizing and sourcing
FishMatch helps land-based fish farms, investors and EPC contractors source recirculating aquaculture system (RAS) equipment — mechanical filtration, biofilters, degassing, oxygenation, UV and process control — through a private, human-reviewed brief matched to species, biomass and feed load. We are not an automatic marketplace: manufacturer profiles are reviewed privately; supplier availability, certifications and performance are not guaranteed.
What is a RAS aquaculture system and what equipment does it need?
A recirculating aquaculture system (RAS) treats and reuses the same culture water in a loop. A commercial RAS needs culture tanks, circulation pumps, mechanical filtration (drum or disc filters), biological filtration (moving-bed or fixed-bed biofilters), degassing and CO₂ stripping, oxygenation (cones, LHO or diffusers), UV or ozone disinfection, water-quality monitoring with alarms, process control, back-up power and effluent handling. Everything is sized from daily feed load and peak biomass, not tank volume alone.
- Removes solids fast, before they break down and load the biofilter with ammonia and fine particles.
- Converts ammonia and nitrite to nitrate biologically, at a rate matched to the daily feed load.
- Strips CO₂ and nitrogen so the fish are not limited by gas build-up even when oxygen is adequate.
- Adds oxygen efficiently at high density, with redundancy so a single failure is not a mortality event.
- Controls pathogens through UV or ozone on the recirculating and make-up flows.
- Monitors, logs and alarms the parameters that decide whether a batch survives the night.
RAS, pond or biofloc: when a recirculating system is the right brief
| Option | Usually fits | What the RFQ must specify |
|---|---|---|
| RAS | Limited water, inland or cold sites, strict discharge limits, year-round output | Defined loop: mechanical filtration, biofilter, degassing, oxygenation, UV/ozone, heat and controls with redundancy |
| Flow-through or pond | Ample suitable water and land with permitted discharge | Intake, aeration, settling and effluent duties instead of a closed treatment loop |
| Biofloc | Warm-water species tolerant of floc, smaller enclosed units | Mixing, aeration, solids control and power resilience rather than biofiltration |
Energy, staffing and maintenance access usually decide the choice as much as capital cost; compare like-for-like scopes.
Project brief checklist
Comparable quotes need the same eight facts from every buyer. Mark anything not yet known as “unknown”.
- Species and life stage — e.g. whiteleg shrimp grow-out, salmon smolt, tilapia fingerlings
- Production target — tonnes per year or juveniles per batch, with harvest size
- Site and water conditions — fresh, brackish or sea water; source; seasonal temperature and salinity tests
- Capacity basis — peak biomass, feed per day, flow or throughput the equipment must handle
- Energy — grid capacity, tariff, backup generation and any renewable supply
- Budget range — with currency and what it must include (equipment only, installed, turnkey)
- Destination — farm location, receiving port and, for product, the target market
- Project stage — study, design, permits, tender or build — and who already holds which approvals
FishMatch is a buyer-side RFQ and supplier-coordination service: the team turns your brief into one comparable request, approaches suitable providers after human review and returns offers on the same basis. It does not own farms or stock equipment, and it does not guarantee suppliers, yields, prices or permits. Managed sourcing is free to buyers for commercial projects from USD 250,000; the guides and calculators stay open to every project size.
Is this the right route for your project?
Commercial projects from USD 250,000
Assisted, supplier-neutral sourcing is free for buyers and built for project owners, procurement teams and industrial buyers. Prepare the eight facts in the project brief checklist above, then start a brief.
Start a free project briefHobby, backyard or aquaponics setups
Small, DIY and retail purchases are outside assisted sourcing. You can still use the free planning tools and guides:
When is FishMatch a good fit for a buyer?
FishMatch can be a fit when a buyer needs structured RFQ intake, aquaculture-specific calculators, project-specific technical information and a clearer procurement path for ras and related aquaculture project scope. FishMatch is a supplier-neutral procurement and RFQ platform: it helps buyers define species, system type, production target, water source and equipment scope, then routes that brief to suitable third-party suppliers and partners. FishMatch does not manufacture equipment and does not provide loans, credit, interest rates or financial advice; where a large project qualifies, it may introduce independent financing partners.
Best for
- ·Aquaculture investors and project developers
- ·Shrimp farm developers and fish farm owners
- ·Consultants preparing an RFQ on behalf of a client
- ·Governments, development programmes and EPC contractors
- ·Buyers who need help defining species, system type, production target, water source and equipment needs
- ·Buyers who need calculators and structured intake before requesting offers
Not ideal for
- ·Aquarium, hobby or ornamental fish equipment
- ·Small retail purchases and single spare parts
- ·Buyers who want instant fixed pricing without project details
- ·Requests outside aquaculture and related systems
- ·Buyers expecting guaranteed financing, credit approval or interest rates
- ·Buyers who cannot provide basic species, system, location or capacity details
RAS Systems: product-type guides
Each guide covers what the equipment does, published specification ranges, sizing, selection points and RFQ questions. Product types only — no supplier names or prices.
- RAS culture tanks
Circular, octagonal and raceway tanks in GRP, HDPE, lined steel or concrete — the hydraulic base of every RAS.
- Drum filters
Rotating screen filters that remove solids before they reach the biofilter.
- RAS biofilters
Moving-bed, fixed-bed and sand filters that turn ammonia into nitrate.
- Oxygen cones
Pressurised contactors that dissolve pure oxygen into a side-stream.
- Oxygen generators (PSA/VPSA)
On-site oxygen from air, with liquid oxygen as backup.
- Water quality sensors
DO, pH, ORP and salinity probes, sondes and IoT stations linked to alarms and aerators.
Typical ras systems we source
- Drum filters
- Moving-bed biofilters
- Degassers
- Oxygen cones
- PLC control
RAS by market
Country planning pages — check local requirements and logistics; a country link does not confirm supplier availability.
Related categories
Engineered RAS systems: what a commercial buyer should receive
An engineered RAS proposal is built on a stated design basis, not a catalogue of parts. Ask every supplier for the same documents so the offers can be compared.
- Design basis: species, target production, standing biomass, feed load and water source
- Process flow diagram and water-quality mass balance (solids, TAN, CO₂, oxygen)
- Sizing of tanks, drum filters, biofilters, degassing and oxygen, with the calculation shown
- Redundancy and backup: pumps, blowers, oxygen and power, and what fails safe
- General arrangement and building layout drawings
- Scope split: what is supplied, installed and commissioned, and what the buyer provides
- Commissioning, biofilter start-up, training and the performance the supplier will stand behind
Size it first with the commercial RAS sizing calculator, then read planning a RAS project and how to compare RAS quotations.
Supplier directories
Country research and project scoping. Supplier availability and service scope require confirmation for each project.
Technical basis and limits
The references below explain system design principles, not supplier prices or biological guarantees. Species, density, survival, FCR, tariffs and financing assumptions must be documented for your site; final sizing requires qualified engineering review. Buyers pay no fee, and suppliers cannot pay for ranking or shortlist position.
Species and production systems served
Specify life stage, feed load, CO₂ and off-flavour limits; request documented redundancy.
Verify temperature, TAN limits and oxygen demand for the site and life stage; include heating where required.
Marine-grade materials, protein skimming and ozone are standard rather than optional.
Often partial-reuse rather than full RAS; oxygenation and solids removal carry the load.
Technically viable where biosecurity or climate justify it; energy cost and margin discipline decide the case.
Capacity bands — what scale this suits
Exact system sizing depends on species, peak biomass, production target, stocking density, water temperature, water quality and site conditions. The bands below are planning orientation only.
Single module, packaged skids, manual dosing, limited redundancy — used to prove species and market.
Multiple tank modules, drum filter plus MBBR per module, oxygen cones, PLC control, generator on life support.
Segregated departments, denitrification, ozone, heat recovery, full SCADA and dual-path redundancy on every critical function.
Industrial facility: engineered intake and discharge, on-site oxygen generation, processing integration and formal commissioning programme.
Specifications that change the quotation
- Daily feed load in kg/day — the master number every process unit is sized from.
- Peak standing biomass and design density in kg/m³ for the species.
- Target TAN, nitrite, nitrate and CO₂ set-points, with the make-up water percentage per day.
- Biofilter media type, specific surface area and design areal TAN removal rate at your temperature.
- Oxygen transfer method and efficiency, plus whether supply is LOX, PSA or VPSA.
- Redundancy philosophy: N+1 on pumps, blowers, oxygen and power on life-support duty.
- Instrumentation, alarm architecture and who is called at 03:00 when DO drops.
What affects the cost
- Production capacity and species, which set feed load and therefore every process unit's size.
- Degree of recirculation: partial reuse is far cheaper than full RAS with denitrification.
- Water temperature versus ambient — heating, cooling and heat recovery are major CAPEX and OPEX lines.
- Energy tariff and pumping head, which dominate operating cost over a 10-year view.
- Redundancy level and back-up power scope.
- Building shell, civil works and tank construction, often larger than the process equipment itself.
- Engineering, installation, commissioning, operator training and spares packages.
We publish no fixed prices. Equipment pricing is project-specific and depends on scope, materials, freight, duties, installation and commissioning at your site.
Request a project-specific quoteRAS vs pond farming — what actually differs
Both produce commercial volumes. The choice follows land, water, climate, energy cost and market price, not technology preference.
| Option | CAPEX | Operating profile | Best suited to |
|---|---|---|---|
| RAS (land-based recirculating) | Highest per ton of capacity | Energy and skilled labour intensive; low water use | Land- or water-constrained sites, cold climates, biosecurity-critical production, premium local markets |
| Pond / semi-intensive | Lowest per ton | Low energy, weather and disease exposed | Large land banks, warm climates, abundant water, cost-led markets |
| Cage / net pen | Low to moderate | Low energy, high environmental and licensing exposure | Suitable coastal or lake sites with licensing available |
Information suppliers need to quote
Send these with your brief so suppliers can respond against the same technical and commercial basis instead of issuing provisional offers.
- Country, site location and nearest port
- Species and target harvest size
- Annual production target in tons and harvest profile
- Greenfield facility or expansion of an existing site
- Freshwater, brackish or marine, with make-up water availability per day
- Water source temperature range and the target culture temperature
- Available land and building footprint, or existing building dimensions
- Grid capacity in kW, voltage, phase and back-up power availability
- Effluent discharge route and permit constraints
- Budget range, financing route and required commissioning date
Related systems and planning tools
Human review, no public contact listing or guaranteed leads.
Quote boundaries, annual-tonne and harvested-kilogram denominators.
Drum, disc and sand filters, protein skimmers and MBBR media.
Screen sizing, flow capacity and matched supplier quotes.
Solids capture, head loss, backwash water and CAPEX compared.
CAPEX/OPEX split, species fit and operator-skill trade-offs.
Oxygenation sizing for high-density RAS tanks.
Denitrification, ozone, UV and effluent treatment.
DO, temperature, pH, TAN monitoring and alarm architecture.
How feed load drives filtration, oxygen and pumping design.
Illustrative model: replace assumptions with dated scope-specific quotes.
Turn biomass and feed load into process sizing.
What each package quote must state: filtration, biofilter, CO₂, oxygen, UV, controls, backup.
TAN load, nitrification area and media volume from your daily feed.
Buyer FAQs
Project, seafood supply or RFQ service: which one do you need?
Commercial aquaculture project
Building, expanding or equipping a fish farm, shrimp farm, hatchery, RAS or processing line. You describe species, capacity, system, site and water.
Use the request form on this pageSeafood sourcing
Buying farmed fish or shrimp as a product, not equipment. A separate brief asks for species, specification, volume, destination and cold chain.
Open the seafood sourcing briefHuman-reviewed RFQ service
There is no instant or automated supplier match. Manufacturer research happens after the project requirement is clear and is reviewed by the FishMatch team before any supplier is approached. No quote, price or financing is guaranteed.
How the review works
Buyers pay nothing. Managed requests start at USD 250,000: total project value for farms and equipment, or total annual or seasonal program value for seafood. FishMatch Group owns no farms or stock and guarantees no availability, price, quality, approval or delivery. Hobby, aquarium, backyard and ornamental systems are outside this service; the free calculators stay open to everyone. Free calculators
Explore aquaculture and RAS suppliers here for research and market discovery, or start with your project requirements so FishMatch can help structure the RFQ and identify relevant system providers for that specific production plan.
Directory — research
Browse categories, countries and technology types to understand the market and which system types exist. Nothing is requested and no supplier is contacted.
Project sourcing — RFQ
Define species, system, production target and site conditions, size the requirement with the planning tools, and build one structured RFQ. Manufacturer research follows the requirement.
- FishMatch helps prepare aquaculture RFQs and source relevant suppliers.
- Supplier and manufacturer listings are provided for independent research, transparency and reference. Listing does not constitute certification, endorsement, qualification for a specific project or automatic introduction.
- Buyer follow-up and supplier selection are handled by FishMatch.
There is no instant or automated supplier match. Manufacturer research happens after the project requirement is clear and is reviewed by the FishMatch team before any supplier is approached.
Manufacturers can register in the free directory and keep their company details up to date. Being listed is a research and visibility surface — it does not create an automatic connection to buyers, and it does not replace the human sourcing process.
Supplier and manufacturer listings are provided for research, transparency and discovery only. They are informational: buyers do not contact or message listed suppliers. Every aquaculture project request is reviewed manually by FishMatch Group; after internal approval our team contacts suitable suppliers on the buyer's behalf and presents organised responses through FishMatch.
Buyer guides
Related equipment buying guides
Practical guides for specifying, comparing and buying aquaculture equipment for commercial fish and shrimp projects.
- Shrimp farming equipment: what to buy and how to start
- RAS farm cost: CAPEX, OPEX and comparing system prices
- How to choose aerators for fish and shrimp ponds
- How to choose automatic fish feeders
- Aquaculture pumps, pipework and valves: buyer's guide
- UV and ozone disinfection equipment for fish farms
Direct answer
What equipment is required for a RAS?
A commercial RAS needs culture tanks, mechanical filtration (drum filters), biofiltration (MBBR or fixed bed), gas control (CO₂ degassing and oxygenation), disinfection (UV or ozone), pumps and pipework, temperature control, monitoring with alarms, and backup power. Suppliers should quote these as one integrated loop sized to your peak feed load, not as separate items.
| Component | Function | Sized by |
|---|---|---|
| Culture tanks | Hold fish at target density | Biomass and density |
| Drum filter | Removes solids | Flow rate and feed load |
| Biofilter (MBBR) | Converts ammonia to nitrate | Daily feed and nitrification rate |
| Degasser + oxygen cones | Strips CO₂, adds O₂ | Feed load and target DO |
| UV / ozone | Disinfection, water clarity | Flow rate |
| Monitoring + backup power | Alarms, safe shutdown | Critical loads |
How do you work out the RAS system?
- Start from annual output and FCR to get daily feed.
- Multiply feed by published factors for ammonia (TAN) and oxygen to size the biofilter and oxygen system.
- Set flow rate from tank turnover, then size filters, pumps and UV.
- Add redundancy for pumps, blowers, oxygen and power.
Worked example: Treatment loads for a 1,000 t salmon RAS (published factors)
| Annual output (example) | 1,000 t/year |
| Economic FCR (land-based salmon study) | 1.08 |
| Feed per year | 1,000 × 1.08 = 1,080 t → ≈ 2,960 kg/day |
| Ammonia (TAN) for biofilter (0.029 kg per kg feed, salmon) | 2,960 × 0.029 ≈ 86 kg TAN/day |
| Oxygen (0.54 kg per kg feed, salmon) | 2,960 × 0.54 ≈ 1,600 kg O₂/day |
Output is an example; FCR from Bjørndal & Tusvik, TAN and oxygen factors from NCRAC Table 2. Averages — engineers size for peak feeding.
What are common RAS system planning mistakes?
- Buying components from different vendors with no one owning the loop.
- No redundancy on pumps and oxygen.
- Sizing to average feed instead of peak biomass.
What should I send suppliers for a RAS system quote?
- Species, output and harvest size
- Peak daily feed
- Water source and temperature
- Building or site available
- Scope: equipment, installation, commissioning, training
What are the limits of these figures?
Sizing depends on species and design choices; figures here are for planning, suppliers confirm the engineering.
Sources: Summerfelt, Engineering Design of a Water Reuse System (NCRAC Walleye Culture Manual), Table 2: oxygen 0.20 walleye / 0.22 trout / 0.54 salmon; TAN 0.027–0.032 per unit feed; Bjørndal & Tusvik, Land based farming of salmon: economic analysis (NTNU Working Paper 1/2017), Tables 4.1 and 4.5
Before you request quotes
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.