The Norwegian Scientific Advisory Committee for Atlantic Salmon has earlier shown that sea trout in many watersheds in Norway is in a poor state, except in Northern Norway, where sea trout is in a better state than the rest of the country. For the first time, we have now assessed the threats from human activities to sea trout. Salmon lice from aquaculture farms is the largest threat to sea trout. The impact of salmon lice is so large, and covers such large geographical area, that this threat alone has been and will be the determining factor for the future development of sea trout. To improve the situation, the salmon lice infestation pressure from fish farms must be considerably reduced. Climate change is the second largest threat. Culverts, channelisation, other habitat alterations, and agriculture are also threats to sea trout, but to a smaller extent than salmon lice and climate change. Hydropower production, water abstraction for other purposes than power production, and infectious diseases also have a significant negative impact on sea trout. 

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• 3 november 2023
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