The public will now be able to keep an eye on some of Ireland's migrating young salmon thanks to a new online system.
The SMOLTRACK project, launched by Inland Fisheries Ireland, will track juvenile salmon as they swim down the River Erriff in Co Mayo.
It is part of an EU-funded project called NASCO, with monitoring also taking place in five other locations in Europe.
The system will be used by scientists to find out how many of these young fish are dying during their long and hazardous journey out to sea.
It will also provide data on smolt run timing and migration behaviour that will be used for conservation planning and stock management.
Other rivers using the counting, tagging and tracking system include the River Bush in Northern Ireland, the River Tamar in England, the Rivers Ulla and Tea in Spain and River Skjem in Denmark.
Each day the number of smolts captured in traps, tagged with tiny acoustic transmitters and released will be counted and the numbers published on a website.
Since the smolt run began on the Erriff on 3 April, 289 have been counted.
The migration season usually runs for about six weeks during April and May.
The fish migration journey will subsequently be monitored by acoustic listening station situated in various locations.
