Humpback salmon have invaded Norwegian rivers every other year since 2017, and their numbers have only increased. A new report from NINA shows that large numbers of humpback salmon also arrived in 2025, but fewer than in the record year of 2023.
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Humpback salmon have invaded Norwegian rivers every other year since 2017, and their numbers have only increased. A new report from NINA shows that large numbers of humpback salmon also arrived in 2025, but fewer than in the record year of 2023.