RAS· May 2026·8 min read

RAS vs flow-through: 2026 economics for fish farms

Capex, opex and water cost — a frank look at when RAS pays back versus traditional flow-through raceways and cages.

RAS still costs 3–5× more per kg of annual production capacity than a flow-through raceway or a marine cage — but it recycles 95–99% of its water, sites near market, controls temperature year-round, and eliminates escape and sea-lice risk. In markets with high water cost, strict environmental permitting or a premium on locally-farmed seafood (Atlantic salmon in the US, sea bass in Central Europe), the RAS payback is under 7 years.

The honest answer: run the numbers for your specific species, market price, energy cost and water permit regime before committing.

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