What are seafood production solutions using recirculating aquaculture systems?
Seafood production solutions using recirculating aquaculture systems (RAS) are methods and practices in aquaculture and fisheries that aim to provide seafood while reducing measurable environmental pressures such as water use, waste discharge, and species escape. These solutions emphasize the controlled use of resources, preservation of ecosystems, and reduction of waste. One of the most technically advanced approaches is Recirculating Aquaculture System (RAS) technology. RAS allows for fish farming on land, offering a controlled environment that reduces the specific negative effects traditionally associated with open-water fish farming, including effluent discharge and non-native species escape.
Unlike conventional aquaculture, which often involves large net pens in open waters, RAS technology involves closed-loop systems that recycle water and nutrients. This reduces the volume of water required and prevents the escape of farmed species into the wild, thereby limiting pressure on local biodiversity. By localizing production facilities, companies like us can reduce the transport distance between production and consumer, which lowers fuel-related emissions compared to conventional long-haul seafood logistics.
How do closed-loop recirculating aquaculture systems (RAS) work?
Closed-loop recirculating aquaculture systems (RAS) are at the forefront of high-tech aquaculture. These systems function by circulating water through a series of filtration processes, allowing it to be reused multiple times. The water is continuously cleaned and oxygenated, maintaining optimal living conditions for the fish. This process uses up to 99% less water than traditional aquaculture, a measurable operational figure based on system design.
One of the primary technical advantages of RAS is its ability to reduce waste discharge. Solid waste from fish is collected and processed, while the water is treated to remove harmful substances before recirculation. This leads to a measurable reduction in effluent discharge compared to open-system aquaculture. Additionally, the controlled environment of RAS reduces the incidence of disease outbreaks, which reduces the operational need for antibiotics or pesticides that are commonly applied in conventional fish farming.
What role does technology play in land-based aquaculture?
Technology is a core component of land-based aquaculture, enabling improvements in operational efficiency and measurable reductions in resource use. Automated systems for monitoring water quality, temperature, and fish health make it possible to maintain optimal conditions with reduced human intervention. These technologies support consistent production quality and enable early detection of potential issues, reducing loss and waste.
In addition to automation, advances in water filtration and feed conversion have further improved resource efficiency. Advanced filtration systems can remove fine particles from water, maintaining a controlled and healthy environment for fish. Feed formulations that incorporate marine algae as an ingredient provide essential nutrients and reduce the proportion of wild-caught fish required in feed composition. This combination of operational technologies makes land-based aquaculture scalable, enabling production capacity to be expanded to meet growing global demand.
How does land-based aquaculture address carbon emissions?
Land-based aquaculture can reduce carbon emissions through energy-efficient operational design and the use of renewable energy sources. Our Varkaus Gigafactory uses solar panels that contribute a measured share of on-site energy consumption, reducing the volume of energy drawn from fossil-fuel-based grid supply. By localizing production and optimizing logistics routes, fuel consumption associated with transportation is reduced compared to conventional long-distance seafood supply chains.
Feed composition also affects the carbon output of aquaculture operations. Incorporating marine algae as a feed ingredient reduces the proportion of conventional fishmeal used, which has a higher associated carbon footprint per unit of protein produced. These operational choices contribute to lower total emissions per kilogram of fish produced and improve the resilience of aquaculture facilities against input cost volatility linked to climate-related disruptions.
What are the future prospects for land-based seafood production?
The outlook for land-based seafood production continues to develop, with ongoing research and development aimed at addressing current technical and economic limitations. The global aquaculture industry is moving toward practices that reduce measurable environmental pressures, driven by consumer demand for traceable products and the need to limit further degradation of marine ecosystems. Companies like us are working to expand the application of RAS technology, including in regions with limited freshwater availability.
The industry faces ongoing challenges, including the need for continued development of alternative feed ingredients and further reductions in energy consumption per kilogram of fish produced. Collaboration between industry operators, researchers, and policymakers will be necessary to address these challenges at scale. As global seafood demand continues to grow, land-based aquaculture using closed-loop systems will play a role in expanding production capacity while reducing the specific pressures that conventional open-water farming places on marine environments.
