Saturday, 28 April 2018

Conference Presentation: Salmon Watch Ireland 21 April 2018


Here under a recent presentation at the Salmon Watch Conference on 21 April 2018. The main emphasis of this presentation was to highlight the knowledge gained over the recent decades in regard to mortality factors of juvenile salmon. 
  • Marine growth rates varied among years, highest growth rates 2002, followed by 2003 and 2009. Lowest growth rates in 2008 (Very poor returns of 1 SW salmon in 2009 and 2 SW in 2010). 2010 saw a good increase in survival for 1 SW fish.
  • Growth rates during the first period at sea were lowest for salmon of southernmost origin (this would include Ireland). This effectively illustrates that climatic change and altered ocean temperatures are affecting post smolt feeding at entry to ocean and along migration route.
  • Inter-annual variation in wind fields, and thus the surface currents, altered the migration pathways. (Illustrates how important weather patterns in spring are)
  • Likely suspects from headwaters to open ocean to be studied to indicate where mortality occurs
  • Certain areas in ocean where change in migration can be affected to be examined
  • Sharing the resources of the ocean with mackerel, herring and blue whiting as well as pressures from commercial exploitation of these stocks
  • Increased mortality strongly linked to impacts of climate change (++Celcius ), SSC’s and changes in the food supply in the ocean 
The presentation is easy to read and any questions you wish to ask can be directed to Salmon Watch Ireland at salmonwatchireland@gmail.com