Q & A: Farming Fish

New York Times: Q. Why do ecologists seem to give the nod to farmed catfish and tilapia but not salmon? A. The ecological issues related to fish farming vary from freshwater to saltwater fish; from carnivorous species to noncarnivores; and from open pens to closed ponds and tanks, among many other factors. Farmed salmon, often raised in pens that are permeable by surrounding ocean waters and fed a diet rich in fish meal and fish oil, have been of special concern to critics like the World ......

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