You can now add jellyfish to the list of things that mess with fish farms.
In northern Norway, at the western side of the Ryggefjord fjord, lies a fish farm with two large open-net pens floating some 200 meters above the seafloor. Run by salmon farming juggernaut Cermaq, the operation has been churning out Atlantic salmon since 1999. But times may be changing for what has been a profitable business.
In September 2015, the farm experienced its fourth mass die-off of salmon since 2002. And according to a paper released in late 2017, the killers appear to be jellyfish.
LINK (via: Hakai Magazine)