Is a higher recirculation rate always better?

No. Higher recirculation reduces water use but raises pumping energy and treatment load. The right rate depends on water availability, energy cost, discharge limits and species tolerance — it is a project-specific trade-off.

How do you handle very low outlier bids?

Map the outlier against the same design table and exclusion list. In most cases a low bid has a lower assumed feed load, a smaller biofilter, or excluded oxygen, building and backup power scope.

RAS

Comparing RAS suppliers without comparing apples to oranges

Updated 2026-08-23 · 9 min read

Short answer

RAS offers are only comparable once you normalise four things: the biological design basis each supplier used, the treatment train and its sizing logic, the redundancy and failure philosophy, and the exclusions. Two systems quoted for the same tonnage can differ by a large factor purely because one assumed a lower feed load or excluded buildings, oxygen supply and backup power.

Ask every supplier to state peak daily feed load and design temperature on the first page.
Normalise on kg feed/day treated, not on tank volume or nominal tonnage.
Redundancy philosophy (N, N+1) is a cost driver and a risk decision the owner must make, not the supplier.
Exclusions — building, oxygen, backup power, effluent treatment — often exceed the difference between offers.

Normalise the design basis first

A recirculating system is sized on feed load, temperature and target water quality, not on the marketing tonnage. Request the design table: peak feed kg/day, design temperature, target TAN, nitrite and CO2 limits, and the assumed daily exchange rate. Once those are on one page for each bidder, most of the apparent price gap explains itself.

Treatment train and sizing logic

Mechanical filtration: drum filter screen size, hydraulic capacity, backwash water consumption.
Biofiltration: type (MBBR, fixed bed, trickling), media volume, specific surface area and the assumed TAN removal rate.
Degassing and oxygenation: CO2 stripping method, oxygen source and dissolution equipment, redundancy of supply.
Disinfection: UV dose or ozone dosing basis and the water stream it treats.
Solids and effluent handling: thickening, storage and discharge assumptions.

Redundancy and failure philosophy

Decide with the client, before issuing the RFQ, what a single equipment failure is allowed to do. Full N+1 on pumps, blowers and oxygen supply costs more up front and reduces catastrophic-loss exposure. Suppliers cannot make that call and will each assume something different if you do not state it.

Energy and operating cost

Ask for an installed-power schedule and an estimated operating-power profile at design load, with the assumptions written out. Compare energy across offers on the same tariff and running-hour assumptions. Treat all supplier operating-cost figures as indicative estimates that require independent verification against local conditions.

FAQ

Equipment Sourcing Aquaculture Calculators Consultant FAQ Consultant downloads

Hand a client project to the concierge

You keep the client and the technical mandate. FishMatch Group runs the private supplier outreach and returns normalised offers.

1. About you

Full name *

Company / practice *

Email *

WhatsApp *

Consultant type *

2. The client project

Client project country *

Project type *

Estimated budget *

Timeline *

Species *

Suppliers / equipment needed *

3. How involved do you want us to be? I stay client-facing — my client relationship stays with me (recommended) You may contact my client directly (off by default — only if you tick it) Financing direction would be useful

Optional details (helps us move faster)

Your country

Website

New project or upgrade

Production target

Water source

Land / site status

Preferred way to reach you

Technical drawings already exist Deliver everything under my brand I would like an NDA first You may join technical calls if I invite you I have more than one project like this

Anything else we should know

We work through you. Your client is not contacted unless you ask us to.

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What is the fastest way to get quotes for Comparing RAS Suppliers Without Comparing Apples To Oranges?

Submit one structured request for Comparing RAS Suppliers Without Comparing Apples To Oranges. FishMatch Group translates it into a technical RFQ, runs a confidential sourcing round with project-matched international suppliers, and returns comparable quotations. No fee is charged to the buyer, and your identity and project details stay private until you choose to proceed.

How it works:

One structured request, human-reviewed before any supplier outreach

Typical turnaround:

Depends on scope and site data; no turnaround is guaranteed

Confidentiality:

Supplier names are never exposed during evaluation

Cost to buyers:

No fee charged to the buyer

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.

Supplier selection criteria

How should a buyer compare aquaculture suppliers?

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.

What are the warning signs in a supplier quotation?

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.

How does FishMatch handle supplier selection?

FishMatch is an independent sourcing layer, not a manufacturer or reseller. Requirements are structured into a single technical RFQ and routed to relevant producers; buyers receive comparable offers without supplier identities being exposed before they choose to proceed. Selection stays with the buyer — FishMatch standardises the comparison basis.