Salmon's 2,300km epic journey from Greenland back to Co Mayo

Map of the tagging and detection locations of the migrating salmon. Picture: Inland Fisheries Ireland

Scientists have tracked a migrating salmon that swam an epic journey of more than 2,300km, from Greenland back to its native river in Co Mayo.

Inland Fisheries Ireland (IFI) has acoustic tracking technology set up at the entrance to Killary Harbour, which picks up signals from any tags attached to fish.