Climate change set to intensify challenges for salmon farming, report finds.
Climate change is already affecting Norway’s coastal and fjord systems, with implications for fish welfare, wild salmon stocks and environmental pressure from aquaculture, according to a new report from the Institute of Marine Research.
The report assesses how a changing climate is expected to impact the salmon farming industry through to 2050, concluding that existing biological and environmental challenges are likely to intensify.
“Taken together, the report points to a clear pattern. Climate change is amplifying problems related to fish welfare, disease, escapes and environmental impact,” said research director Mari Myksvoll.
The findings indicate that farmed salmon are likely to face increased health challenges, while wild salmonids may come under greater pressure. At the same time, fjord ecosystems are expected to experience higher cumulative environmental loads.
Changing coastal conditions
Researchers highlight a range of physical and chemical changes along the Norwegian coast and in fjords, including:
- rising sea temperatures
- more frequent marine heatwaves
- increased precipitation and freshwater runoff
- lower salinity levels
- reduced oxygen concentrations
“These are environmental changes that make ecosystems more vulnerable to human activity,” said research director Ingrid A. Johnsen. “Warmer seas and more frequent heatwaves create more challenging living conditions for both farmed salmon and wild coastal species.”
The report suggests that these shifts may reduce the capacity of marine environments to absorb the impacts of aquaculture operations.
Implications for production and regulation
While the industry has historically adapted to biological and environmental risks, the report indicates that climate-driven changes could alter disease dynamics, fish health outcomes and site performance.
Knowledge gaps remain, particularly around how disease transmission and fjord circulation patterns may evolve under changing climatic conditions.
Nevertheless, the overall direction is clear, according to the researchers.
“The broader picture is unambiguous. Climate change is already affecting Norwegian coastal and fjord areas, and these effects will intensify toward 2050,” said Myksvoll.
The report calls for greater flexibility in management and regulation, alongside increased investment in knowledge and technology, to enable the industry to adapt to changing operating conditions.
Researchers said improved preparedness could help mitigate some of the risks identified, but warned that both industry and policymakers will need to adjust to a more complex and less predictable operating environment.
