Salmon Farm Cost: CAPEX, OPEX and Cost per Kilogram

2. Where the capital actually goes

In sea farming, pens, moorings and the feed barge dominate, and licence acquisition can dwarf all hardware. In land-based projects the split inverts: tanks, building shell and water treatment carry 50 – 70% of the budget, and redundancy on power, oxygen and pumping is a cost of entry rather than an upgrade.

• Site, licences & marine surveys5 – 20%

  Sea-site licences are traded assets in Norway, Chile and Scotland and can exceed the hardware cost. Land-based projects instead carry land, grid and water-rights cost.

• Pens, moorings & nets (sea)20 – 35%

  Certified to the local standard (NS 9415 in Norway). Exposed sites need heavier moorings, larger circumference pens and anti-predator nets.

• Tanks, civil works & building shell (land)25 – 40%

  Dominant block in RAS. Concrete tank volume and insulated shell scale directly with standing biomass, not with harvest tonnage.

• Water treatment & life support (RAS)20 – 30%

  Drum filters, moving-bed biofilters, degassers, oxygen cones, UV or ozone, plus full redundancy on the critical loop.

• Feed barge, feeding & sensors8 – 15%

  Feed barge with silo capacity, blowers, cameras, biomass estimation and environmental sensors. Central to FCR control.

• Vessels, wellboat access & harvest6 – 15%

  Workboats, net cleaning, delousing capacity and access to wellboat and harvest slots — often contracted rather than owned.

• Power, oxygen & standby generation5 – 15%

  Land-based sites need full standby generation and liquid-oxygen backup; a short unnoticed outage kills the standing biomass.

• Engineering, commissioning & contingency10 – 15%

  Never below 10% on RAS. Biological commissioning of biofilters adds months before design output is reached.

3. Operating cost structure

Feed is 45 – 60% of salmon operating cost, so FCR and feeding-system control outrank any equipment discount. The second variance driver differs by system: sea lice and mortality control at sea, energy and biofilter stability on land. Both should be modelled as ranges, not point estimates.

• Feed45 – 60%

  USD 1.60 – 2.40/kg feed. At economic FCR 1.15 – 1.35, feed alone is typically USD 1.90 – 3.20 per kg of salmon produced.

• Smolt / post-smolt input8 – 15%

  USD 1.20 – 3.00 per 100 g smolt; large post-smolt at 0.5 – 1 kg cost far more but cut sea time by 3 – 6 months.

• Energy3 – 8% (sea) / 15 – 25% (RAS)

  Pumping, oxygenation and temperature control dominate land-based OPEX. Model at the site tariff, not a national average.

• Labour8 – 15%

  Sea sites are labour-light per tonne; RAS needs shift-based operators, water-quality technicians and maintenance staff.

• Health, sea lice & mortality control6 – 15%

  Delousing, cleaner fish, vaccination and treatment capacity. Biological cost is the largest variance line in conventional sea farming.

• Harvest, primary processing & logistics8 – 15%

  Wellboat, slaughter, gutting, ice and airfreight or chilled road transport to market.

• Insurance, maintenance & overheads5 – 10%

  Biomass insurance is standard and prices off site exposure and mortality history; budget 3 – 5% of equipment CAPEX per year for maintenance.

4. Cost per kilogram produced

Farm-gate cost per kilogram head-on gutted is the figure lenders and offtakers test. Benchmarks below assume normal survival, no major biological event and full capacity utilisation from the second production cycle; a first cycle at 60 – 70% of design output is the realistic base case.

Interactive cost estimator

Enter your target output and system to turn the benchmarks on this page into an indicative budget. Figures are derived from the CAPEX table and the farm-gate cost per kg table, and follow the same logic as the worked budget.

7. Worked budget: 5,000 t/yr conventional sea site

A concrete screening budget for the most common configuration we scope for buyers — a single conventional sea-cage grow-out site in a temperate region, buying 150 g smolt and selling head-on gutted salmon at the harvest station.

• • 8 pens of 160 m circumference, permitted standing biomass ≈3,120 t
• • 150 g smolt stocked, 14 – 18 months sea time, harvest weight 5.0 kg HOG-equivalent
• • Economic FCR 1.25, cumulative mortality 12%, design output 5,000 t/yr
• • Licence value excluded — treated separately as a traded asset
• • Wellboat, delousing and harvest capacity contracted, not owned

Screening figures only, excluding licence acquisition, land, taxes and duties. Salmon is unusually working-capital heavy because the standing biomass is financed for more than a year before the first sale.

5. Post-smolt is the highest-return capital in salmon

Growing smolt to 0.5 – 1 kg on land before transfer shortens sea time by three to six months, cuts lice exposure and mortality, and raises the biomass a fixed licence can produce per year. Per tonne of additional output, post-smolt capacity is usually cheaper than either buying licence capacity or building full land-based grow-out.

6. Making the numbers bankable

Financiers test biology first: smolt input weight, sea time, economic FCR, mortality and harvest weight. Present CAPEX split into licence, marine or civil works, process equipment and contingency, and OPEX per kg at three mortality scenarios. Land-based projects additionally need a written failure-mode analysis for power, oxygen and water treatment.