Sea Bass & Sea Bream Farm Cost: CAPEX, OPEX and Cost per Kilogram

2. Where the capital actually goes

Cages, nets and the mooring grid carry 25 – 40% of the budget, and site exposure decides whether that is a light bay grid or a certified offshore system at three times the price. Buyers routinely under-budget the shore base: quay access, net and feed storage, ice and packing regularly add 10 – 20% to a plan that only priced marine hardware.

• Concession, licensing & environmental studies3 – 12%

  Marine concessions, EIA, benthic surveys and monitoring plans. Timeline risk here is usually larger than cost risk.

• Cages, nets & mooring grid25 – 40%

  Circular HDPE collars of 20 – 32 m diameter for sheltered sites; heavier grids, deeper nets and submersible systems offshore.

• Feed barge or shore feeding system10 – 20%

  Automatic feeding with silos and cameras. Below ~800 t/yr, shore-based feeding and boat distribution is usually cheaper than a barge.

• Boats, net washing & handling gear8 – 15%

  Workboat with crane, net-cleaning rig, graders, fish pump and live-transport tanks.

• Nursery / pre-growing capacity8 – 18%

  Pre-growing 2 g fry to 10 – 20 g on land cuts sea mortality sharply and is the single best return on integration for this species pair.

• Shore base, storage & cold chain10 – 20%

  Quay, feed store, net store, ice or chilling, packing area and staff facilities. Chilled logistics is decisive for EU market access.

• Monitoring, control & biosecurity3 – 7%

  Oxygen and temperature profiling, current metering, mortality removal and stock-counting systems.

• Engineering, permits & contingency10 – 15%

  Never below 10%. Exposed sites should carry the top of the range for storm-loss allowance.

3. Operating cost structure

Feed is 45 – 60% of operating cost and FCR sits at 1.8 – 2.2 — materially worse than salmon — so feeding control and grading discipline decide margin. Juvenile quality is the second lever: pre-grown 10 – 20 g stock costs more per head but cuts first-months sea mortality and shortens the cycle.

• Feed45 – 60%

  USD 1.30 – 1.90/kg feed. At economic FCR 1.8 – 2.2, feed alone is typically USD 2.40 – 4.00 per kg of fish produced — the highest feed share per kg of the three species in this cluster.

• Juveniles / fingerlings8 – 15%

  USD 0.16 – 0.40 per 2 – 5 g fry; pre-grown 10 – 20 g juveniles cost more but survive far better at sea.

• Labour10 – 18%

  Diving, net changes, grading and harvest are labour-intensive relative to salmon at the same tonnage.

• Energy & vessels5 – 12%

  Fuel for daily site access and net washing dominates on sea sites; on land-based RAS, electricity rises to 15 – 25%.

• Health, vaccination & mortality4 – 10%

  Vaccination against vibriosis and photobacteriosis, parasite control and routine diagnostics. Summer temperature peaks drive mortality events.

• Harvest, packing & logistics8 – 15%

  Ice slurry harvest, grading, polystyrene packing and chilled road or air transport to European wholesale markets.

• Insurance, maintenance & overheads5 – 10%

  Storm and biomass insurance, net repair, mooring inspection. Budget 3 – 5% of equipment CAPEX per year for maintenance.

4. Cost per kilogram produced

Farm-gate cost is the figure buyers and lenders test against Mediterranean wholesale prices, which swing seasonally. Benchmarks assume normal survival (80 – 88% from 10 g), no major summer mortality event, and full utilisation from the second 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: 1,000 t/yr sheltered sea bream and sea bass site

A concrete screening budget for the configuration most buyers start with — a sheltered or semi-sheltered Mediterranean cage site producing a mixed sea bream and sea bass crop, buying 5 g fry and selling whole chilled fish at the packing station.

• • 12 circular cages of 24 m diameter, permitted biomass ≈700 t
• • 5 g fry stocked, pre-grown on site to 15 g, 80 – 85% survival to harvest
• • Harvest 400 g average, economic FCR 2.0, design output 1,000 t/yr
• • Shore-based feeding and boat distribution, no feed barge
• • Concession granted; acquisition cost excluded from this budget

Screening figures only, excluding concession acquisition, land, taxes and duties. Run your configuration in the CAPEX calculator, then send the brief for supplier-neutral quotations.

5. Temperature and site exposure decide the model

Growth stalls below 14 °C and mortality risk rises above 27 °C, so the same cage system produces very different annual tonnage in the Aegean, the Adriatic and the Gulf. Exposed sites gain water quality and biomass allowance but pay in mooring cost, lost working days and storm risk — model accessible working days explicitly.

6. Making the numbers bankable

Financiers want stocking weight, survival, economic FCR, harvest size mix and cycle length tied to measured site temperature. Split CAPEX into concession, marine works, shore base and contingency, and present OPEX per kg at three survival scenarios plus a low-price scenario reflecting Mediterranean price cycles.