Rainbow trout fish farms contribute over 2% of all Finnish nutrient emissions entering the Baltic Sea, according to an EU-financed report published this week by the national environment institute and game and fisheries research institute. Eutrophication due to excessive nutrient levels is one of the main environmental challenges facing the region.
Fish farm releases could be cut through better feeding techniques and altering fish food production, the report says. Changes in fish enclosures would be too expensive for an industry already in financial difficulties and struggling to compete with larger Norwegian fish farms, it adds.
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