News from SeaSalar
Marine food consumption by adult Atlantic salmon and their energy requirements in a warming ocean
30. April 2023

How expected increased ocean temperatures associated with climate change may impact marine food consumption and energetics of adult salmon has been explored in a new study.

Atlantic salmon juveniles start marine  feeding soon after leaving the rivers
27. February 2023

The diet of nearly six hundred salmon post-smolt caught in Norwegian fjords was analysed in a new study. Already at that early stage of the marine migration, it is important for the salmon to find fish larvae to feed on.  

Iteroparity and its contribution to life-history variation in Atlantic salmon
26. February 2023

New study of iteroparity, or repeat spawning, of Atlantic salmon in 179 rivers shows that the proportion of repeat spawners averaged 3.8% (0-26% across rivers). Females were more often repeat spawners than males and lost less body mass between each spawning.

Invasive pink salmon, do they compete with Atlantic salmon for food in the North Atlantic Ocean?
26. February 2023

Invasive pink salmon eat what they find; fish larvae, amphipods, krill, like Atlantic salmon, but so far abundance is too low to expect competition in the ocean. Local impacts by pink salmon on coastal ecosystems cannot be ruled out.

Reduced waterflow in a river after hydropower regulation induced evolutionary change in body size and sea-age of the Atlantic salmon population
26. October 2022

River Eira once harbored some of the largest salmon in the world, but has now evolved into an ordinary salmon population. New study shows clear evidence of an unintentional human-induced evolution.

Genetic stock identification reveals greater use of an oceanic feeding ground around the Faroe Islands by multi-sea winter Atlantic salmon, with variation in use across reporting groups
25. October 2022

While it is known that the oceans around the Faroe Islands support an Atlantic salmon feeding ground, the relative use of this resource by different age classes and populations has, until now, been largely unexplored.

They dive but they do not eat
8. June 2022

New study of adult Atlantic salmon in near-coastal areas shows that they migrate through surface waters and perform aperiodic dives - both on outward migration and return.

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
20. April 2022

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
5. April 2022 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.
Drastic and sudden change in the Norwegian Sea led to a rapid decline in the growth of wild salmon at sea
5. March 2022

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.

Rapid evolution in salmon life history induced by direct and indirect effects of fishing
25. February 2022

Congratulations to Yann Czorlich and co-authors with publishing important results on Atlantic salmon in prestigious Science!

Poor feeding opportunities and reduced condition factor for Atlantic salmon in the Northeast Atlantic Ocean
19. September 2021

During the last few decades, many wild Atlantic salmon populations have declined. One possible contributing factor for the decline is reduced prey availability at sea.

Understanding the migration routes of Atlantic salmon during their first months at sea
13. September 2021

Extensive international collaboration and analysing 30 year’s catches of salmon at sea provide new information on key foraging areas.

Atlantic salmon in a rapidly changing environment - facing the challenges of reduced marine survival and climate change
30. June 2021

The global scale of climate change, altered ocean ecosystems and reduced sea survival make these threats to Atlantic salmon diffi

Redefining the oceanic migration of Atlantic salmon
13. June 2021

Many surprises from tagging Atlantic salmon with pop-up satellite tags. Further north and east than we thought, more use of oceanic fronts, deeper dives and staying in colder water.