Salmon farming in marine pens

salmon farming marine pen salmon jumping pisciculture senja island sustainability commercial aquafarm salmo salar consumerism controversial stocked fish food production salmonidae norway norwegian farming oceanfarmed seafood overpopulation sustainable farm aquaculture scandinavia marine environment leaping out controversy industry sea cage environment food fishing europe business fishery ocean protein fish species enclosed aquatic breeding atlanticsalmon farmedsalmon production northern norway arctic arctic circle