Aquaculture water treatment systems: duties, sizing and quotes
FishMatch helps fish and shrimp farms, hatcheries and EPC contractors source aquaculture water treatment equipment — intake filtration and disinfection, solids removal, biofiltration, denitrification, UV and ozone, and effluent treatment — matched to flow rate, feed load and discharge requirements.
What water treatment does a commercial fish farm need?
Three trains matter. Intake treatment (screening, sedimentation, filtration, UV or chlorination) keeps pathogens and solids out. Process treatment (mechanical filtration, biofiltration, degassing, oxygenation, UV) holds water quality inside the system. Effluent treatment (settling, filtration, constructed wetlands or dedicated units) meets discharge permits. Scope follows daily flow rate, feed load and the local discharge standard, not farm size alone.
- Screens and disinfects incoming water so pathogens and wild fish do not enter the farm.
- Removes solids before they degrade and load the biological stage.
- Converts ammonia and nitrite biologically at a rate matched to the daily feed load.
- Removes nitrate through denitrification where make-up water is limited.
- Disinfects recirculating and make-up flows with UV or ozone.
- Treats effluent to the discharge standard your permit specifies.
Farm water treatment or processing water: different duties
| Option | Usually fits | What the RFQ must specify |
|---|---|---|
| Intake treatment | Source water entering hatchery or farm | Measured source quality, filtration, disinfection and biosecurity requirements |
| Culture water (RAS loop) | Recirculating systems | Solids, ammonia removal, CO₂ stripping, oxygen and UV/ozone sized to feed load |
| Effluent and processing water | Discharge and plant hygiene | Discharge limits set by the competent authority; processing water follows food-safety rules |
Treatment is sized from measured water tests and the feed load; ask suppliers to state the design basis in writing.
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.
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 water treatment 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
Water Treatment 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.
- 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.
Typical water treatment systems we source
- Solids removal
- Biofiltration
- Denitrification
- Ozone
- UV
Water treatment by market
Country planning pages — check local requirements and logistics; a country link does not confirm supplier availability.
Supplier directories
Country research and project scoping. Supplier availability and service scope require confirmation for each project.
Species and production systems served
Cold-water, high feed load; CO₂ stripping, fine solids control and off-flavour management dominate.
Warm water lowers oxygen solubility and raises biofilter rates; heat recovery matters.
Intake biosecurity and effluent treatment are the licence-critical stages.
Protein skimming, ozone and marine-grade materials throughout.
Highest disinfection standard per litre; small flows, tight tolerances.
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.
Low flow, high specification: fine filtration, UV, protein skimming, precise temperature control.
Intake screening and sedimentation, drum filter, packaged biofilter, settling pond for effluent.
Engineered intake, multi-stage solids removal, MBBR biofiltration, degassing, UV or ozone and permitted effluent treatment.
Full treatment plant with denitrification, sludge dewatering, monitoring and reporting to the discharge permit.
Specifications that change the quotation
- Design flow rate in m³/h for intake, recirculation and discharge.
- Daily feed load in kg/day, which sets solids and TAN production.
- Source water analysis: turbidity, salinity, temperature, iron, hardness, alkalinity and pathogen risk.
- Target water-quality set-points for TAN, nitrite, nitrate, CO₂ and DO.
- Screen apertures, filter media and biofilter specific surface area at your temperature.
- UV dose in mJ/cm² or ozone dose, verified for the pathogen target and water clarity.
- Discharge permit limits for solids, nitrogen, phosphorus and biological load.
What affects the cost
- Design flow rate and feed load.
- Source water quality — poor intake water can cost more to treat than the process loop itself.
- Recirculation percentage and whether denitrification is required.
- Discharge standard and whether sludge dewatering is mandated.
- Marine versus freshwater service and the resulting materials specification.
- Level of instrumentation, automation and compliance reporting.
- Civil works, tank construction, pumping head and commissioning.
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 quoteInformation 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 and discharge authority
- Species and production system
- Annual production target and daily feed load in kg/day
- Design flow rates for intake, recirculation and discharge in m³/h
- Source water type, temperature range and available analysis
- Target water-quality set-points
- Discharge permit limits, if already issued
- Greenfield installation or retrofit into existing infrastructure
- Grid capacity and back-up power
- Budget range and required commissioning date
Related systems and planning tools
Drum, disc and sand filters, skimmers and biofilter media.
How treatment stages combine into a recirculating loop.
Parameter-by-parameter troubleshooting and equipment routes.
Effluent treatment scope, cost drivers and permitting.
Continuous measurement and compliance logging.
Turn flow rate and head into pump duty.
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
How do you size water treatment for a commercial fish farm?
Size water treatment from the peak daily feed, because feed sets the waste load. About 2.5–3% of feed becomes ammonia-nitrogen, which the biofilter must convert; filter types handle very different loads per m³ of media. Add solids removal, degassing to keep CO₂ below 20 mg/L, and disinfection at a stated UV dose — research for salmon farming recommends 25 mJ/cm². Quote the whole treatment line on one feed basis.
| Treatment step | Published figure | Source |
|---|---|---|
| Ammonia load (biofilter) | About 2.5–3% of feed becomes ammonia-nitrogen | SRAC 451 |
| Biofilter loading | RBC 3.6 · bead filter 13 · fluidized sand 20–40 kg feed per m³ media per day | SRAC 453 |
| Degassing | Keep free CO₂ below 20 mg/L for most species | SRAC 451 |
| UV disinfection | 25 mJ/cm² recommended; kills 99.9% of most tested bacteria and viruses | Nofima CtrlAQUA |
| Hard-to-kill virus | IPNV needed about 246 mJ/cm² | Liltved et al. 2006 |
How do you work out the water treatment system?
- Set the peak daily feed from target output.
- Multiply feed by 2.5–3% for the ammonia the biofilter must remove.
- Divide feed by the loading rate of the chosen filter type for media volume.
- Size degassing to keep CO₂ under 20 mg/L.
- Choose the UV dose for the hardest pathogen you need to cover.
Worked example: Example farm feeding 1,000 kg a day
| Ammonia-nitrogen (2.5–3%) | ≈ 25–30 kg per day |
| Biofilter media, bead filter (13) | 1,000 ÷ 13 ≈ 77 m³ |
| Biofilter media, fluidized sand (20–40) | ≈ 25–50 m³ |
| Biofilter media, RBC (3.6) | 1,000 ÷ 3.6 ≈ 278 m³ |
| UV dose to specify | 25 mJ/cm²; far higher if IPNV is a risk |
The 1,000 kg feed load is an example input; the rates are published planning figures (SRAC 451/453, Nofima, Liltved), not a supplier design or quote.
What are common water treatment system planning mistakes?
- Comparing biofilter offers without the same feed basis — loading per m³ differs by type up to tenfold.
- Sizing on average feed instead of the peak feed day.
- Buying UV by lamp wattage instead of delivered dose.
- Forgetting CO₂ removal.
- Leaving discharge treatment out of the scope until permits are reviewed.
What should I send suppliers for a water treatment system quote?
- Species, output and peak daily feed
- Water source, flow, temperature and salinity
- Biofilter type preferred, if any
- Target CO₂ limit and UV dose
- Discharge rules and treatment scope
What are the limits of these figures?
SRAC figures are US extension planning values from 1998–1999, and UV doses come from laboratory tests on salmon pathogens; temperature, water clarity and species change results, so the supplier's process engineer confirms the final design.
Sources: Losordo, Masser & Rakocy, SRAC Publication 451 (1998): water-quality limits, ~3% of feed becomes ammonia; Losordo, Masser & Rakocy, SRAC Publication 453 (1999): biofilter loading per m³ of media; Nofima CtrlAQUA fact sheet, UV requirements for inactivation of viruses, bacteria and sea lice (2023); Liltved et al., High resistance of fish pathogenic viruses to UV irradiation and ozonated seawater, Aquacultural Engineering (2006)
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.