From Marine Harvest's Handbook 2016, industry estimates: http://www.marineharvest.com/globalassets/investors/handbook/2016-salmon-industry-handbook-final.pdf, its figures:
Norway: According to Nofima there were over 9,600 full time employees in the aquaculture industry in Norway in 2013. The employment effect of derived activities of aquaculture purchases are nearly 15,000 employees. In total there
are over 24,000 full time employees either directly or indirectly as a result of the aquaculture industry in Norway.
Scotland: According to Scotland Salmon Producers Organisation (SSPO), over 2,500 people are employed in salmon production in Scotland. The Scottish Government estimates that over 8,000 jobs are generated directly or indirectly by the aquaculture industry.
Canada: Estimates on Canadian employment say that around 15,000 people are employed in aquaculture, where 6,000 are based in British Colombia.
Chile: Direct employment in aquaculture (incl. processing) is estimated to around 30,000 people in 2014.
The Marine Harvest Group has a total of 12,454 employees in 23 countries worldwide (31 Dec2015).
In Norway, both salaries and levels of automation are highest, while the opposite is the case in Chile. Salaries in UK and Canada are somewhat lower
than in Norway.
Now the BC stats figures, the only good stats in Canada: http://fishfarmnews.blogspot.ca/2013/02/sport-fishing-how-we-tack-up-feb-6-2013.html.
BC Stats puts full, multiplier job figures for all of aquaculture, not simply fish farms at 1,700, or only 28.3% of what Marine Harvest claims.
I went out and found the actual number of employees at fish farms in BC. It is 820 jobs, or only 13.7% of what Marine Harvest claims.
So, if you want to know what the real number of employees in any country is, just multiply the Marine Harvest figures by .137, or roughly one in ten.