What is RAS in simple terms?
RAS is a fish farming system where water is repeatedly cleaned, oxygenated and returned to the fish tanks, allowing production with controlled water quality and lower fresh water use.
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RAS fish farming technologies
Select a direction to go to a specific page: general RAS scheme, technology for the type of fish or type of farm water supply.
Short answer
The Technology section explains how RAS, flow-through, raceway and semi-recirculation systems work, and what production regimes are needed for sturgeon, trout, African catfish, tilapia, whitefish and fry.
General RAS technology
Basic page about the RAS principle, system components, water, oxygen and automation.
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Sturgeon RAS technologies
Water parameters, stocking density and cycle of growing sturgeon for meat and caviar.
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Trout RAS technologies
Cold-water technology for trout: temperature, oxygen and hydraulics of the complex.
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Technologies for African catfish
Intensive warm cultivation of clariid catfish with high stocking density.
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Technologies for whitefish
Whitefish, peled, muksun and other cold-loving species with high water requirements.
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Technologies for tilapia
Warm-water RAS for tilapia: full cycle, commercial fish and combined schemes.
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Incubation and fry technologies
Incubation, larvae and rearing of planting material under controlled conditions.
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Direct-flow fish farming systems
Flow farms with a stable water source and a large volume of high-quality water.
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Partially reversible systems
A hybrid of RAS and flow-through scheme: part of the water is purified and returned to circulation.
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Channel fish farming systems
Channel farms with long trays, low-pressure circulation and calculated hydraulics.
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FAQ
Frequently asked questions
Clear answers to the questions that usually appear before a RAS fish farm project starts.
Which aquaculture technology is best?
The best option depends on species, water source, climate, building, investment range, target capacity, energy costs and the level of automation required.
Why does each project need individual calculation?
Even the same species can require different tanks, filtration, oxygen supply, hydraulics and redundancy depending on biomass, feed load, water quality and site layout.