Supplier selection
Short answer
Water treatment is where aquaculture proposals diverge most quietly. Two systems can list the same components and be sized for very different loads, so the mass balance — not the component list — is what must be compared.
A credible design starts from a real analysis: temperature range, salinity, turbidity, iron and manganese, hardness, nitrogen compounds, seasonal variation and microbiological quality. A supplier who does not ask for this is sizing from assumptions.
“Which source water parameters do you require, and how do they change the design?”
Require the solids, TAN, CO2 and oxygen balance at peak feed load and design temperature, with the resulting flow, turnover and treatment capacity. This is the single most useful document for comparing offers.
“Provide the mass balance and hydraulic design at peak feed load.”
Mechanical filtration, settling, swirl separation and their combination determine downstream biofilter performance. Ask what solids capture is assumed and what happens to performance if it is not achieved.
“State assumed solids capture efficiency and the effect of underperformance.”
Moving bed, fixed bed and other concepts have different footprints, start-up times and operating characteristics. Compare surface area, hydraulic loading and stated TAN removal at design temperature.
“Give biofilter media surface area, loading rate and TAN removal at design temperature.”
Oxygen transfer method, expected efficiency and the CO2 stripping capacity determine both water quality and energy cost. Degassing is regularly under-specified in low-exchange systems.
“State oxygen transfer efficiency, oxygen source and CO2 stripping capacity.”
UV and ozone serve different purposes and carry different risks and operating costs. Ask why the proposed approach fits your pathogen risk, water clarity and species, and what safety systems are included.
“Justify the disinfection approach for our water quality, species and risk profile.”
Sludge thickening, storage, disposal and effluent limits are frequently outside the equipment scope but inside your permit. Confirm who is responsible for meeting discharge conditions.
“Define sludge handling, effluent treatment and who guarantees discharge compliance.”
Water treatment is a continuous load. Compare annual kWh, oxygen consumption, chemical and media replacement, and the service agreement available in your country.
“Provide annual energy, oxygen and consumable estimates plus local service terms.”
Categories, not rankings. Companies are named as examples of who operates in each category; inclusion is not an endorsement and the list is not exhaustive.
Process water-treatment providers
Complete treatment trains for recirculating and partial-reuse systems, usually including process guarantees under stated conditions.
Component specialists
Drum filters, biofilter media, oxygen cones, degassers, UV and ozone units — often integrated by a system supplier. Give every bidder the same design flow, feed load and water-quality targets.
Effluent and sludge specialists
Thickening, dewatering and discharge compliance packages, frequently procured separately from the recirculation system.
Water quality centre
Parameters, problems and treatment responses.
RAS water turnover calculator
Flow, turnover and makeup water from your system volume.
Filtration calculator
Size mechanical and biological filtration from feed load.
How to compare RAS quotations
Normalise treatment scope across competing offers.
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 aquaculture supplier selection, RFQ preparation and supplier-neutral proposal comparison. 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.
One specification, issued to qualified suppliers, returned in a comparable format.
Before you request quotes
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.
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.
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.
Compare on evidence, not on presentation: delivered projects at a similar scale and climate, engineering support during design, lead time commitments, spare-part and service availability in your region, certification and testing documentation, payment and warranty terms, and willingness to quote against your specification rather than substituting a catalogue package.
Treat these as review triggers: no itemised scope, guaranteed biological or financial performance, no named delivery terms or lead time, no spare-parts or service statement, unclear responsibility for installation and commissioning, and equipment sizing that does not reference your water temperature, oxygen demand or biomass targets.
FishMatch is an independent sourcing service, not a manufacturer or reseller. The buyer submits one structured project request; our team reviews it first and only then contacts suitable suppliers on the buyer's behalf, presenting their responses through FishMatch in a comparable format. Buyers do not contact suppliers directly and nothing is sent automatically. The final choice stays with the buyer.