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Beitrag von troutcontrol »

A new study published in the Nature Journal, Scientific Reports reveals the marine migration route of Atlantic salmon in the North Atlantic. Led by Arctic University of Norway, it involves co-operative research by 10 universities and institutions across Europe.

The survey required tagging 204 salmon kelts with satellite tags from seven European countries, including Ireland’s Barrow, Nore, Suir and Blackwater, and the east coast of North America, and tracked them during their oceanic migration.
Salmon travelled to oceanic fronts, but with specific patterns. Norwegian and Danish salmon migrated towards the north Atlantic between Iceland and Svalbard. In contrast, Irish salmon headed towards south and east Greenland. Despite the variation, most migrated to polar ocean frontal areas.
Salmon released further south tended to cover longer distances, with a straight-line tracked 2,400km for one salmon from the river Suir. Tagged salmon spent 80 per cent of their time foraging at the surface and performed occasional dives up to 870m.
Overall, populations closest in proximity tended to converge in their oceanic feeding area, but taken together exploited a very large part of the ocean. Given that Atlantic salmon from different geographic locations feed in distinct areas at sea, they experience different temperature regimes.
For example, Irish salmon experienced much warmer temperatures, ranging from 5 to 16°C, whereas Norwegian and Danish salmon adapted to temperatures from 0 to 11°C. These differences not only contribute to variation in growth and survival, but are likely to impact on Atlantic salmon differently with changing climate. Southernmost populations, like those of Ireland, are more at risk than northernmost as migration distances are likely to become longer, thereby decreasing feeding time, with consequences for marine survival of different populations.
Taken together these findings suggest that a common marine factor responsible for the decline in Atlantic salmon is unlikely. Importantly, this means conservation efforts should be focused locally, such as during the freshwater phase.

Harald aus LEV
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Re: Lachsmonitoring

Beitrag von Harald aus LEV »

Hi Martin,

sehr interessant. Danke fürs Einstellen.

Rheinischer Fliegenfischer Stammtisch

***Open mind for a different view ***
***Forever trust in who you are ***
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Re: Lachsmonitoring

Beitrag von Fliifi-Sepp »

Ja, definitiv sehr interessant!

Und klar, daß die örtlichen Maßnahmen für eine Stärkung der Population die wichtigsten Maßnahmen sind, denn nur die können örtlich beeinflußt werden. Ein Gesamtheitliches Konzept wäre zwar wünschenswert, ist aber viel schwieriger umzusetzen.
Also erst mal dort anfangen, wo man selber was bewegen kann.
Aber das auch tun, nicht nur bei den Lachsen!

LG Sepp