Atlantic salmon is a well-studied species, but there are still mysteries of where they reside in the ocean and what impacts their marine survival. ATLANTIC SALMON AT SEA - factors affecting their growth and survival (SeaSalar) is a research program where research institutions join forces to increase the knowledge on Norwegian salmon at sea.

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The River Etne fish trap operated by the Institute of Marine Research. Long-term recordings of downstream and upstream migrating Atlantic salmon provide valuable data. Photo Eva B. Thorstad

Time series covering up to four decades reveals major changes and drivers of marine growth during the first year at sea in an Atlantic salmon population

Increased zooplankton biomass was positive for marine growth, and salmon lice negative. Data from the River Etne fish trap are published in a new study by Alison Harvey, Øystein Skaala and colleagues

Reduced extent of nutrient-rich Arctic water in the Norwegian Sea reduced the feeding and feeding conditions of Atlantic salmon

New study of stomach content data over a 25-year period shows how important fish larvae are for the marine diet of young Atlantic salmon - and how feeding conditions are impacted by ocean current systems and inflow of Arctic water.
Atlantic salmon. Photo: Eva B. Thorstad

Drastic and sudden change in the Norwegian Sea led to a rapid decline in the growth of wild salmon at sea

During just one year, the growth of wild salmon was greatly reduced along large parts of the Norwegian coast, particularly among populations in Western Norway and Southern Norway. Scientists have uncovered why this happened in a new study - and at the same time revealed an ecological regime shift in the Northeast Atlantic Ocean.