Study Claims Norway’s Fish Farms Exceed National Sewage Output with Waste

(MENAFN) Fish farming operations in Norway are reportedly releasing waste into coastal waters at levels far exceeding the country’s human sewage output, according to a recent research report.

The findings were published by the Sunstone Institute, which analyzed pollution from nearly 1,000 fjord-based aquaculture sites. The study focused on waste generated from fish excrement and unused feed discharged directly into marine environments.

According to the report, the amount of nitrogen and phosphorus released last year from these facilities was comparable to the sewage output of “17.2 million and 20 million people, respectively.” It further stated: “Triple the toilet waste from an entire country,” noting that Norway’s population is approximately 5.5 million.

Researchers warned that this level of nutrient discharge can have serious ecological effects. Elevated nitrogen and phosphorus levels can trigger large algal blooms, which consume oxygen as they break down, potentially forming “dead zones” where marine life struggles to survive. The report also highlighted that uneaten feed drifting from aquaculture cages may attract wild fish, exposing them to degraded water conditions and excessive nutrient exposure.

These conclusions contrast with Norway’s international reputation for strong environmental performance. In the 2024 Environmental Performance Index compiled by Yale and Columbia universities, the country ranked highly, placing 7th overall and 2nd in environmental health.

Norwegian authorities have not yet issued a response to the report. However, representatives from the seafood industry have rejected its implications. The Norwegian Seafood Federation stated that production levels remain “well within nature’s carrying capacity” and argued that there is no clear evidence linking fish farming operations to environmental damage in fjord ecosystems.

Despite environmental concerns, aquaculture remains a key part of the Norwegian economy. The country is the world’s largest producer of farmed salmon, responsible for more than half of global supply. With extensive coastal access, Norway exports seafood to markets in Europe, the United States, and Asia, with recent figures showing over 100,000 tonnes shipped in a single month valued at more than $1 billion.

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