Stocked marine pen - lots of salmon breaking the surface

norway aquaculture salmon farming aquaculture fish farm farmedsalmon production pisciculture salmon pen marine pens fish mortality rates oceanfarmed fishery atlantic salmon aquafarm lofoten salmonidae arctic circle sustainability marine pen fish food production aquatic scandinavia enclosed seafood salmo salar sustainable salmon breaking the surface aerial norway cage atlantic industry ammonia farm ocean farming norwegian jumping drone commercial marine intensive antibiotics arctic controversy polar night stocked controversial