Land-based fish farming offers a documented alternative to oceanic overfishing and declining wild fish stocks. This approach uses Recirculating Aquaculture Systems (RAS) to create controlled environments where fish can be raised with reduced water consumption and contained waste output. Finnforel is applying this technology in Finland, producing rainbow trout whilst keeping water discharge out of natural water resources and marine ecosystems. Discover how land-based fish farming is changing food production and providing a measurable alternative to traditional fishing methods.
What is land-based fish farming and how does it work?
Land-based fish farming utilises Recirculating Aquaculture Systems (RAS) to grow fish in controlled indoor environments away from natural water bodies. These closed-loop systems continuously filter and reuse water, creating optimal conditions for fish growth whilst minimising water consumption and limiting discharge into the surrounding environment.
The RAS technology works by circulating water through a series of filtration and treatment processes. Water from fish tanks passes through mechanical filters to remove solid waste, then through biological filters where beneficial bacteria convert harmful ammonia into less toxic compounds. Additional systems regulate temperature, oxygen levels, and pH balance to create defined growing conditions. In Finnforel’s facilities, the water circulates through the purification system twice an hour, effectively removing even the finest particles.
This closed-loop approach reduces water usage compared to traditional aquaculture — using up to 99% less water while preventing waste discharge into natural ecosystems. The controlled environment also optimises growth conditions, allowing for year-round production regardless of external weather or seasonal changes.
Why is land-based aquaculture becoming crucial for global food security?
Land-based aquaculture is gaining relevance for global food security as oceanic overfishing has led to severe depletion of wild fish stocks worldwide. With over 90% of global fisheries either fully exploited or overfished according to UN reports, alternative protein sources are urgently needed to meet growing demand.
The world’s population continues to increase, requiring more protein sources that can be produced efficiently. Fish represents an excellent source of lean protein and essential nutrients, but traditional fishing methods cannot sustainably meet this demand. Land-based aquaculture provides a documented alternative by producing fish in controlled environments without drawing on ocean resources.
Additionally, climate change and pollution are threatening marine ecosystems, further reducing the reliability of wild-caught fish. RAS systems like those developed by Finnforel offer a consistent, predictable food supply that reduces pressure on natural fisheries whilst contributing to food security for future generations. Learn more about how land-based fish farming addresses these challenges.
How does Finnforel’s RAS technology differ from traditional fish farming?
Finnforel’s RAS technology differs from traditional fish farming methods through several measurable operational features. Unlike conventional open-net fish farms that release waste directly into natural waters, Finnforel’s closed-loop system captures and treats all waste, preventing pollution and nutrient loading in lakes and oceans.
Water conservation is another key difference. Traditional aquaculture consumes large quantities of water, while Finnforel’s RAS technology recirculates and purifies water, using approximately 99% less fresh water than conventional methods. The water used in their Varkaus facility is taken from Lake Saimaa and thoroughly treated, with disinfection and oxidation processes removing even microplastics and fine particles.
The controlled environment enables precise management of all growing conditions — from temperature and oxygen levels to feed delivery and waste removal. This results in consistent fish health, measurable feed conversion rates, and consistent product quality. Additionally, this approach allows production facilities to be located close to consumers, reducing transportation distances and associated carbon emissions while ensuring maximum freshness.
What environmental benefits does land-based fish farming provide?
Land-based fish farming delivers a number of measurable environmental outcomes that distinguish it from traditional aquaculture and wild fishing. The most significant is the reduction in water pollution. By containing and treating all waste within closed systems, these farms prevent the release of nutrients, chemicals, and organic matter into natural ecosystems.
Another documented benefit is the elimination of fish escapes. When farmed fish escape from traditional ocean pens, they can interbreed with wild populations, introducing genetic changes and potentially spreading diseases. Finnforel’s land-based systems create a complete physical barrier that protects wild fish biodiversity.
Reductions in transport-related emissions are also achievable. By placing production facilities closer to consumers, transportation distances and associated emissions are reduced. Finnforel has additionally installed solar panels at their Varkaus facility, increasing on-site renewable energy generation capacity.
| Environmental Benefit | RAS Impact |
|---|---|
| Water Usage | Up to 99% reduction compared to conventional methods |
| Pollution | Near-zero discharge to natural waters |
| Wild Fish Protection | Complete prevention of escapes and disease transfer |
| Carbon Footprint | Reduced through localised production and renewable energy |
How does fish feed composition impact the overall environmental footprint?
Fish feed composition represents a critical operational factor in aquaculture, significantly influencing the overall ecological footprint. Traditional fish farming often relies on feeds containing high percentages of wild-caught fish meal and oil, contributing to ocean overfishing and creating a counterproductive cycle.
The feeds used in Finnforel’s operations incorporate alternative protein sources and optimised formulations that reduce dependence on marine ingredients. These feeds are environmentally certified and carefully monitored to ensure they contain no harmful contaminants, resulting in fish that meet defined quality standards.
Feed conversion efficiency is another measurable factor. The controlled conditions in RAS facilities enable precise feeding schedules and amounts, minimising waste and maximising the conversion of feed into fish biomass. This efficiency reduces the resources required to produce each kilogram of fish protein, lowering the resource intensity of production while maintaining fish health and nutritional quality.
What makes rainbow trout an appropriate species for land-based aquaculture?
Rainbow trout possesses several biological and market characteristics that make it well-suited for land-based aquaculture. This species adapts well to RAS environments, thriving in the controlled conditions these systems provide while demonstrating measurable resistance to common fish diseases when properly managed.
From a nutritional perspective, rainbow trout offers documented health benefits, being rich in high-quality protein, omega-3 fatty acids, and essential vitamins and minerals. The fish grows efficiently on plant-based feeds, requiring less marine-derived ingredients than many other farmed species, which reduces dependence on wild-caught fish meal inputs.
Market acceptance is another significant factor. Rainbow trout has widespread consumer appeal with its mild, versatile flavour profile and firm texture that works well in various culinary applications. Finnforel’s rainbow trout is produced as young fish, which ensures no accumulation of harmful substances can take place, resulting in products that meet clean food standards and can even be eaten raw if preferred.
How is land-based aquaculture shaping the future of food production?
Land-based aquaculture is emerging as a significant development in food production, offering documented responses to multiple challenges facing global food systems. The technology is advancing, with developments in energy efficiency, waste processing, and automation continuously improving operational and resource performance.
Investment in the sector is accelerating, with companies like Finnforel attracting significant funding to expand operations. Finnforel’s international expansion, including exploration of facilities in the UAE in partnership with ADQ, demonstrates the global applicability of these systems to produce protein in diverse geographic locations, including water-scarce regions.
As consumers increasingly demand locally produced food with transparent supply chains, land-based aquaculture is positioned to meet these expectations. The technology enables food production with contained environmental impact, while delivering consistent quality and freshness. For a deeper understanding of how this approach is changing food systems, visit Finnforel’s fish farming resource.
The future of food production will likely see further integration of circular economy principles, with waste streams becoming valuable inputs for other processes. This approach to resource management, combined with continued technological advancement, positions land-based aquaculture as a significant component of resilient food systems. Interested in learning more about Finnforel’s approach to land-based fish farming? Contact our team today for more information.
