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Define production and sales before asking for cost
State the fish species, harvest size, standing biomass, peak daily feed, crop types, plant area, production method and saleable unit. Add the planned sales channel, packing, cold storage and waste route. A system sized for leafy greens and a warm-water fish has different temperature and nutrient duties from one intended for another combination.
The production model should state startup sequence and ramp rate. Biofilters, staff routines and markets do not reach steady state on the first day. Include quarantine, fingerling receipt, crop propagation, harvest, grading and mortality handling. A supplier cannot produce a defensible budget when these flows are unknown.
Separate cost into auditable packages
| Package | Scope to define | Evidence to request |
|---|---|---|
| Site and building | Survey, civil work, drainage, structure, covering, rooms and access | Design basis, drawings, loads, quantities and exclusions |
| Greenhouse climate | Vents, screens, heating, cooling, circulation and controls | Hourly weather assumptions, installed capacities and sequence |
| Aquaculture loop | Fish tanks, solids removal, biofiltration, aeration and disinfection | Peak-feed basis, hydraulic profile, oxygen duty and cleaning method |
| Plant loop | Rafts, channels or substrate, irrigation, lighting and harvest access | Flow, slope, zoning, crop load and failure response |
| Utilities and resilience | Power, backup, water, drainage, alarms and communications | Load list, autonomy, redundancy, alarm routing and acceptance tests |
Ask every bidder to label equipment, freight, duties, local labor, installation, startup, training and spare parts. A low greenhouse price may exclude fish life-support equipment. A low aquaponics equipment price may exclude the building, cooling, electrical work or wastewater handling.
Use peak feed to anchor filtration scope
Fish feed drives solids and dissolved nutrient loads. The process designer should state the peak feed, assumed waste fractions, hydraulic turnover, mechanical filtration, biofilter basis, oxygen demand and cleaning frequency. Ask for the calculation and its safety factors. Do not accept a filter selected only by tank volume.
This page owns the project budget and RFQ intent. Use CFGET’s aquaponics filtration-sizing guide for the separate technical discussion of solids removal and biofilter inputs. Keeping those intents separate avoids repeating the same formulas in two articles.
Map the hydraulic profile before equipment selection
Show water levels, pipe sizes, gravity drops, pump heads, bypasses, isolation valves, drains and overflow routes. Identify the highest and farthest operating points. The layout should allow a tank, filter or plant zone to be isolated without losing the entire system where the production plan requires that resilience.
Pumps should be selected at the installed head and expected water condition. Provide accessible strainers, unions, drains and lifting space. Record how the system is restarted after maintenance or a power interruption without sending accumulated solids into fish or plant zones.
Protect dissolved oxygen and circulation
Fish, nitrifying bacteria and plant roots depend on oxygen. The risk is highest when temperature, biomass or biological demand is high. Ask for normal and emergency oxygen duties, blower or pump redundancy, distribution layout, monitoring points and the time allowed before operator action. EPA dissolved-oxygen guidance explains the biological importance of oxygen, but the final limits must match the chosen species and responsible aquaculture advice.
Backup power should cover the agreed life-support loads, not merely the control panel. Show generator or battery capacity, automatic transfer, fuel autonomy and load priority. Test the failure of a blower, water pump, sensor, controller and normal power source. Alarms need named recipients, escalation and an operator who can physically respond.
Coordinate greenhouse and water temperature
Greenhouse air, solar gain, humidity and water temperature interact. Ask for an hourly weather file and a water heat-balance approach. State the allowable ranges for fish, bacteria and crops, then show where heating or cooling energy enters the system. An air-temperature setpoint alone cannot describe fish-tank risk.
Ventilation, shade, evaporative cooling, mechanical cooling and water heating or chilling each have site limits. The controls narrative should prevent one system from fighting another. Define condensation management, equipment-room ventilation and the safe response to extreme weather.
Start with water quality and a discharge plan
Test the source before design. Include pH, alkalinity, hardness, salinity, relevant ions, metals, turbidity and microbiological indicators. State storage, treatment and makeup capacity. Aquaponics recirculates water, but solids purge, cleaning, mortality events and crop handling still create waste streams that require a plan.
Show sampling points and laboratory schedule. Identify who owns fish-health, crop, water-quality and food-safety decisions. A greenhouse vendor can integrate equipment but should not substitute for responsible aquaculture, veterinary, crop, environmental or food-safety professionals.
Design cleaning and worker access into the layout
Filters need frequent access. Provide drains, hose points, lifting clearances, non-slip routes and a place for captured solids. Separate feed storage, chemicals, clean tools, dirty tools, harvest handling and waste. Material selection must match water chemistry, disinfectants, ultraviolet exposure and operating temperature.
Write the sanitation sequence before construction. It should cover tanks, pipes, filters, plant channels, harvest tools and rooms. State what can be cleaned while production continues and what requires isolation. Include worker safety around wet electrical areas, confined spaces, chemicals and heavy covers.
Model operating cost and downside cases
Operating cost should include electricity, fuel, feed, fingerlings, seed, supplements, water treatment, testing, labor, packaging, waste, maintenance, replacements, insurance and delivery. Record the expected operating hours and equipment efficiency. Use local tariffs and supplier maintenance intervals.
Revenue should use marketable crop and fish volume, sell-through, grade-out and actual sales channels. Test lower sales, higher feed or energy cost, mortality and downtime. Do not use a universal ROI or payback period. The same equipment can produce very different financial results under different markets and operating discipline.
Commission biology-supporting duties
Dry commissioning should verify structure, plumbing, valves, pumps, blowers, controls, power and alarms before fish are introduced. Wet commissioning should test flow, leaks, tank levels, drainage, oxygen distribution, sensor calibration and emergency modes. Biological startup then needs its own acceptance plan and responsible adviser.
Handover should include approved drawings, hydraulic profile, equipment schedule, controls narrative, setpoint ranges, calibration records, software backups, spare parts, manuals, training and emergency contacts. Record who can change settings and how changes are logged.
RFQ inputs for a commercial aquaponics greenhouse
- Site, weather, survey, drainage, access, permitting and expansion plan.
- Fish species, standing biomass, harvest size, peak feed and production calendar.
- Crop types, plant method, growing area, harvest unit and market route.
- Water analysis, source capacity, storage, treatment and discharge constraints.
- Air and water temperature boundaries plus humidity and extreme-weather duties.
- Hydraulic profile, filtration, biofilter, aeration and sanitation responsibilities.
- Electrical load, outage history, backup autonomy, alarms and response ownership.
- Food safety, fish health, crop advice, waste, worker safety and laboratory interfaces.
- Freight, civil work, installation, startup, commissioning, training and spares.
- Acceptance tests, documentation, warranties, service response and exclusions.
Related CFGET resources
Use the greenhouse installation guide to assign project stages, the climate-control scope for air and water heat interfaces, the irrigation and water-system scope for responsibilities, and the growing-systems overview when selecting the plant zone.
Technical references
- FAO: Small-scale aquaponic food production
- University of New Hampshire: Aquaponic greenhouse research facility
- US EPA: Dissolved oxygen and aquatic organisms
Send CFGET the site, weather, fish and crop plan, peak feed, water analysis, utilities and responsibility matrix. A useful quotation should expose calculations, equipment duty, drawings, exclusions and acceptance tests.
