NGO group Sea Shepherd has turned its sights on Cermaq's recent algae-related die off in British Columbia, claiming that mortalities are rising at an alarming rate, and drawing a parallel with Mowi's die-off in Eastern Canada.

"It's not a good sign if algal blooms are happening on cloudy days in the middle of November," Sea Shepherd Director of Marine Operations Locky Maclean told IntraFish.

Mclean theorizes that lice treatment Hydrolicer may be one of the causes of the die off based on observation of the fish's skin, and he alleges the treatment was used on the three impacted farms.