The company I visited processes 300,000 to 400,000 pounds of seafood each week, selling to supermarkets and restaurant chefs (including ours). More than half of their sales volume is salmon, of which 75 to 80 percent is farmed. (We only buy the wild stuff though.)
Dozens of pallets of salmon trucked 1,500 miles from ocean pens in British Columbia. They are stored in a large room consistently chilled to 36 degrees F. The fish are packed in uniform-sized disposable boxes weighing 100 pounds each; one-quarter of the weight is ice. Everything in the room is white—the lab coats we're wearing, Styrofoam boxes, fluorescent ceiling bulbs. It looks like a morgue for the sea.
via www.theatlantic.com
In this piece, Helen York of Bon Appetite Management Co. asks why more fish waste can't be turned into cat food. I asked this same question when I visited a plant in Alaska. The reason, it turned out, was that the fuel needed to process the cat food was more than the cat food would earn. Hence, the waste ended up in the bay as fish food.