Recirculating Aquaculture Is Possible without Major Energy Tradeoff: Life Cycle Assessment of Warmwater Fish Farming in Sweden
Seafood is seen as promising for more sustainable diets. The increasing production in land-based closed Recirculating Aquaculture Systems (RASs) has overcome many local environmental challenges with traditional open net-pen systems such as eutrophication. The energy needed to maintain suitable water quality, with associated emissions, has however been seen as challenging from a global perspective.
This study uses Life Cycle Assessment (LCA) to investigate the environmental performance and improvement potentials of a commercial RAS farm of tilapia and Clarias in Sweden. The environmental impact categories and indicators considered were freshwater eutrophication, climate change, energy demand, land use, and dependency on animal-source feed inputs per kg of fillet.
We found that feed production contributed most to all environmental impacts (between 67 and 98%) except for energy demand for tilapia, contradicting previous findings that farm-level energy use is a driver of environmental pressures. The main improvement potentials include improved by-product utilization and use of a larger proportion of plant-based feed ingredients. Together with further smaller improvement potential identified, this suggests that RASs may play a more important role in a future, environmentally sustainable food system.
Research news | 2022-01-10
Peter Jørgensen receives European Research Council starting grant
The grant consists of 1,5 million Euro over five years for studying the emergence of new problem species in agriculture and human health
Research news | 2021-12-16
Freshwater biodiversity must be given a higher priority
Research and conservation of freshwater biodiversity is lagging behind. Researchers propose 15 priorities to improve knowledge on biodiversity in lakes, rivers, ponds and wetlands
Research news | 2021-12-14
Turning tension into transformation
Too much time is spent debating which agenda for change is best, instead of finding ways to facilitate better interactions among different interests
Research news | 2021-12-14
Global Resilience Partnership releases report on their work at COP26
The report synthesises the key overarching messages from their activities at the conference and offers guidance for future actions towards COP27
Research news | 2021-12-13
In a warming world the ocean will struggle as a carbon sink
Biological feedbacks mean the ocean will struggle to remove as much carbon from the atmosphere as expected
Research news | 2021-12-08
Getting a more complete picture of our impact on nature
New metric can help investors, companies, cities, and governments track their environmental impacts beyond greenhouse gas emissions