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SeaSalar.no - Atlantic Salmon at Sea - Factors affecting their growth and survival


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SeaSalar.no

 

 

Atlantic Salmon at Sea - Factors affecting their growth and survival

 

The main aims of the SeaSalar research program are to examine factors impacting variation in marine survival of Atlantic salmon over time and in different geographical areas - and to establish a long-term inter-institutional collaboration for present and future projects.

Strengthened collaborative use of data is essential.

 

Link:

http://www.seasalar.no/

 

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  • 3 months later...

Vi vet i dag mye om villaksens liv i elver og vassdrag, men mindre om hva den utsettes for i havet.

Nå forener sentrale forskningsmiljøer krefter i et nytt forskningsprosjekt for å undersøke hva som skjer med laksen mens den er i havet.

 

Norsk institutt for naturforskning (NINA):

Skal avsløre villaksens liv i havet

 

Link:

https://www.nina.no/Om-NINA/Aktuelt/Nyheter/article/skal-avslore-villaksens-liv-i-havet

 

 

Vi vet i dag mye om villaksens liv i elver og vassdrag, men mindre om hva den utsettes for i havet.

Nå forener sentrale forskningsmiljøer krefter i et nytt forskningsprosjekt for å undersøke hva som skjer med laksen mens den er i havet.

 

Havforskningsinstituttet (HI):

Skal avsløre villaksens liv i havet

 

Link:

http://www.imr.no/hi/nyheter/2017/12/skal-avslore-villaksens-liv-i-havet

 

 

Vi vet i dag mye om villaksens liv i elver og vassdrag, men mindre om hva den utsettes for i havet.

Nå forener sentrale forskningsmiljøer krefter i et nytt forskningsprosjekt for å undersøke hva som skjer med laksen mens den er i havet.

 

UiT Norges arktiske universitet:

Skal avsløre villaksens liv i havet

 

Link:

https://uit.no/nyheter/artikkel?p_document_id=553816

 

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The SeaSalar project was officially launched 1 August 2018.

We had a kick-off meeting with enthusiastic project planning and discussion of ideas in Bergen in the end of August.

 

SeaSalar - Atlantic Salmon at Sea:

Kick-off meeting

 

Link:

http://www.seasalar.no/NewsArticle/ArticleId/4612/Kick-off-meeting

 

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  • 5 months later...

A new study detected clear negative impacts of salmon lice in terms of reduced growth of salmon during the first months at sea, but more so in years when the general sea survival was low.

 

SeaSalar - Atlantic Salmon at Sea:

Poor ocean conditions may worsen the effects of other impacts on salmon

 

Link:

https://www.seasalar.no/NewsArticle/ArticleId/4738/Poor-ocean-conditions-may-worsen-the-effects-of-other-impacts-on-salmon

 

Artikkelen "Context-dependent impact of an ectoparasite on early marine growth in Atlantic salmon" kan du lese her.

 

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  • 4 weeks later...

Predation on adult Atlantic salmon by endothermic fish (bluefin tuna and porbeagle), large toothed whales and other fish was recorded.

 

SeaSalar - Atlantic Salmon at Sea:

New publication on ocean predation and mortality

 

Link:

https://www.seasalar.no/NewsArticle/ArticleId/4760/New-publication-on-ocean-predation-and-mortality

 

Artikkelen "Ocean predation and mortality of adult Atlantic salmon" kan du lese her.

 

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  • 6 months later...

Since 2008 we have tagged more than 1000 adult salmon from the Alta River with temperature sensing data storage tags in order to understand more about ocean migration and habitat use while at sea.

 

SeaSalar - Atlantic Salmon at Sea:

Trends in ocean temperatures affect the thermal habitat of Atlantic salmon during summer and autumn, but not during winter

 

Link:

https://seasalar.no/NewsArticle/ArticleId/4903/Trends-in-ocean-temperatures-affect-the-thermal-habitat-of-Atlantic-salmon-during-summer-and-autumn-but-not-during-winter

 

Artikkelen "Thermal habitat of adult Atlantic salmon Salmo salar in a warming ocean" kan du lese her.

 

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  • 5 months later...

Last spring Atlantic salmon were tagged with satellite tags in Southern Norway.

Now they have phoned home.

 

SeaSalar - Atlantic Salmon at Sea:

Wild salmon’s wild journey in the ocean

 

Link:

https://www.seasalar.no/NewsArticle/ArticleId/4989/Wild-salmon-s-wild-journey-in-the-ocean-1

 

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  • 1 month later...

This is the preliminary story of the travels of salmon tagged with satellite tags in River Nidelva at Arendal.

The story includes a new record, with bluefin tuna or porbeagle involved.

 

SeaSalar - Atlantic Salmon at Sea:

Ocean-cruise with salmon from southern Norway - we follow salmon from River Nidelva on a dangerous journey in the ocean

 

Link:

https://www.seasalar.no/NewsArticle/ArticleId/5029/Ocean-cruise-with-salmon-from-southern-Norway-we-follow-salmon-from-River-Nidelva-on-a-dangerous-journey-in-the-ocean

 

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  • 2 months later...

Lea Hellenbrecht successfully defended her master thesis at the University of Bergen in the beginning of September, on feeding of wild Atlantic salmon post-smolts in Norwegian fjords.

 

SeaSalar - Atlantic Salmon at Sea:

Master thesis with exciting results on marine feeding of young salmon

 

Link:

https://www.seasalar.no/NewsArticle/ArticleId/5089/New-master-thesis-with-exciting-results-on-marine-feeding-of-young-salmon

 

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  • 4 weeks later...

PIT-tags are often used to study marine mortality in salmon.

It is important that the tagging itself does not increase mortality.

New review publication assessed tagging effects based on available studies.

 

SeaSalar - Atlantic Salmon at Sea:

Reliable survival estimates based on tagged fish depend on using small enough tags

 

Link:

https://www.seasalar.no/NewsArticle/ArticleId/5106/Reliable-survival-estimates-of-tagged-fish-depend-on-using-small-enough-tags

 

Artikkelen "Systematic review and meta-analysis of PIT tagging effects on mortality and growth of juvenile salmonids" kan du laste ned her.

 

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  • 2 months later...

We looked at potential competition between salmon and mackerel or herring, in a new publication.

There was no evidence to support the hypothesis that lower marine survival for salmon in recent years can be explained by competition with herring or mackerel.

 

SeaSalar - Atlantic Salmon at Sea:

Do salmon post-smolts compete for food with mackerel or herring?

 

Link:

https://www.seasalar.no/NewsArticle/ArticleId/5137/Do-salmon-post-smolts-compete-for-food-with-mackerel-or-herring

 

Artikkelen "Feeding interactions between Atlantic salmon (Salmo salar Linnaeus) post-smolts and other planktivorous fish in the Northeast Atlantic" kan du lese her (abstract - artikkel krever innlogging).

 

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  • Glalaksen changed the title to SeaSalar.no - Atlantic Salmon at Sea - Factors affecting their growth and survival
  • 4 months later...

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.

 

SeaSalar - Atlantic Salmon at Sea:

Redefining the oceanic migration of Atlantic salmon

 

Link:

https://www.seasalar.no/NewsArticle/ArticleId/5168/New-publication-on-the-oceanic-migration-of-Atlantic-salmon

 

Artikkelen "Redefining the oceanic distribution of Atlantic salmon" kan du laste ned her.

 

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  • 1 month later...

The global scale of climate change, altered ocean ecosystems and reduced sea survival make these threats to Atlantic salmon difficult - but not impossible - to address.

We review impacts and suggest management options in a new article.

 

SeaSalar - Atlantic Salmon at Sea:

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

 

Link:

https://www.seasalar.no/NewsArticle/ArticleId/5173/Atlantic-salmon-in-a-rapidly-changing-environment-facing-the-challenges-of-reduced-marine-survival-and-climate-change

 

Artikkelen "Atlantic salmon in a rapidly changing environment - Facing the challenges of reduced marine survival and climate change" kan du lese her.

 

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  • 1 month later...

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

 

SeaSalar - Atlantic Salmon at Sea:

Understanding the migration routes of Atlantic salmon during their first months at sea

 

Link:

https://www.seasalar.no/NewsArticle/ArticleId/5180/Understanding-the-migration-routes-of-Atlantic-salmon-during-their-first-months-at-sea

 

Artikkelen "The early marine distribution of Atlantic salmon in the North-east Atlantic: A genetically informed stock-specific synthesis" kan du lese her.

 

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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.

 

SeaSalar - Atlantic Salmon at Sea:

Poor feeding opportunities and reduced condition factor for Atlantic salmon in the Northeast Atlantic Ocean

 

Link:

https://www.seasalar.no/NewsArticle/ArticleId/5182/Poor-feeding-opportunities-and-reduced-condition-factor-for-Atlantic-salmon-in-the-Northeast-Atlantic-Ocean

 

Artikkelen "Poor feeding opportunities and reduced condition factor for salmon post-smolts in the Northeast Atlantic Ocean" kan du lese her (abstract - artikkel krever innlogging).

 

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  • 3 months later...

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

 

SeaSalar - Atlantic Salmon at Sea:

Rapid evolution in salmon life history induced by direct and indirect effects of fishing

 

Link:

https://www.seasalar.no/NewsArticle/ArticleId/5203/Rapid-evolution-in-salmon-life-history-induced-by-direct-and-indirect-effects-of-fishing

 

Artikkelen "Rapid evolution in salmon life history induced by direct and indirect effects of fishing" kan du lese her (abstract - artikkel krever innlogging).

 

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  • 1 month later...

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, a new NORCE-led study shows.

Scientists have also uncovered why this happened. 

 

SeaSalar - Atlantic Salmon at Sea:

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

 

Link:

https://www.seasalar.no/NewsArticle/ArticleId/5205/Drastic-and-sudden-change-in-the-Norwegian-Sea-led-to-a-rapid-decline-in-the-growth-of-wild-salmon-at-sea

 

Artikkelen "Ecological regime shift in the Northeast Atlantic Ocean revealed from the unprecedented reduction in marine growth of Atlantic salmon" kan du lese her.

 

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  • 1 month later...

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.

 

SeaSalar - Atlantic Salmon at Sea:

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

 

Link:

https://www.seasalar.no/NewsArticle/ArticleId/5209/Reduced-extent-of-nutrient-rich-Arctic-water-in-the-Norwegian-Sea-reduced-the-feeding-and-feeding-conditions-of-Atlantic-salmon

 

Artikkelen "Impacts of a Changing Ecosystem on the Feeding and Feeding Conditions for Atlantic Salmon During the First Months at Sea" kan du lese her.

 

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  • 2 weeks later...

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.

 

SeaSalar - Atlantic Salmon at Sea:

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

 

Link:

https://www.seasalar.no/NewsArticle/ArticleId/5211/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-populati

 

Artikkelen "Time series covering up to four decades reveals major changes and drivers of marine growth and proportion of repeat spawners in an Atlantic salmon population" kan du lese her.

 

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  • 1 month later...

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.

 

SeaSalar - Atlantic Salmon at Sea:

They dive but they do not eat

 

Link:

https://www.seasalar.no/NewsArticle/ArticleId/5220/They-dive-but-they-do-not-eat

 

Artikkelen "Diving and feeding of adult Atlantic salmon when migrating through the coastal zone in Norway" kan du lese her.

 

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  • 4 months later...

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.

 

SeaSalar - Atlantic Salmon at Sea:

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

 

Link:

https://www.seasalar.no/News/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

 

Artikkelen "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" kan du lese her.

 

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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.

 

SeaSalar - Atlantic Salmon at Sea:

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

 

Link:

https://seasalar.no/News/reduced-waterflow-in-a-river-after-hydropower-regulation-induced-evolutionary-change-in-body-size-and-sea-age-of-the-atlantic-salmon-population

 

Artikkelen "Large-effect loci mediate rapid adaptation of salmon body size after river regulation" kan du lese her.

 

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  • 4 months later...

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.

 

SeaSalar - Atlantic Salmon at Sea:

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

 

Link:

https://seasalar.no/News/invasive-pink-salmon-do-they-compete-with-atlantic-salmon-for-food-in-the-north-atlantic-ocean

 

Artikkelen "Geographic distribution, abundance, diet, and body size of invasive pink salmon (Oncorhynchus gorbuscha) in the Norwegian and Barents Seas, and in Norwegian rivers" kan du lese her.

 

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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.

 

SeaSalar - Atlantic Salmon at Sea:

Iteroparity and its contribution to life-history variation in Atlantic salmon

 

Link:

https://seasalar.no/News/iteroparity-and-its-contribution-to-life-history-variation-in-atlantic-salmon

 

Artikkelen "Iteroparity and its contribution to life-history variation in Atlantic salmon" kan du lese her.

 

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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.

 

SeaSalar - Atlantic Salmon at Sea:

Atlantic salmon juveniles start marine feeding soon after leaving the rivers

 

Link:

https://seasalar.no/News/atlantic-salmon-juveniles-start-marine-feeding-soon-after-leaving-the-rivers

 

Artikkelen "Diet analysis of Atlantic salmon (Salmo salar) post-smolts after the ecological regime shift in the Northeast Atlantic" kan du lese her.

 

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