What is a drawback of farming a carnivorous fish versus an herbivorous fish?
The farming of carnivorous species, like salmon and shrimp, is much more energy intensive and much more problematic in many ways than the farming of herbivorous fishes, such as carp and tilapia or the growing of mollusks — like clams, mussels, oysters. For example, it takes from two to five pounds of wild caught fish, converted to fish protein and fish oil to produce one pound of many of the high trophic level species, like salmon and shrimp. So, in fact, those kinds of aquaculture are most definitely not part of the solution required to feed many people in the future. Could you comment on fish yield and what that represents? Species like shrimp and salmon, that are carnivores in the wild are also carnivores in shrimp pens, or shrimp ponds. The have to be fed fish protein, and in fact, it takes between two and five pounds of wild caught fish to produce one pound of many of those carnivorous species. This is a real problem because this is clearly not enhancing wild caught fisheries. It
