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Bryan Walsh's article does a decent job covering the decline of the world's fisheries, and the need for solutions. But like so many articles on the subject, it buries what should be the lede:\u003Cbr \/\u003E\n\u003Cbr \/\u003E\n\u003Cspan style=\"font-size: x-small;\"\u003EEspecially troubling, many of the most popular farmed species are carnivores, meaning they need to be fed at least partly with other fish. By one count, about 2 lb. of wild fish ground up to make fish meal is needed on average to produce 1 lb. of farmed fish, which leaves the ocean at a net loss.\u003C\/span\u003E\u003Cbr \/\u003E\n\u003Cbr \/\u003E\nI've written about this \u003Ca href=\"http:\/\/simondonner.blogspot.com\/2008\/11\/farming-oceans.html\"\u003Ebefore\u003C\/a\u003E: A substantial proportion of the wild harvest is used to maintain marine  aquaculture of carnivorous species like salmon. It is wildly  inefficient, the marine equivalent of farming wolves rather than  herbivorous cattle. This is why many experts conclude that the future  for pescetarians is probably the blander, lower-on-the-food-chain  species like tilapia and catfish.\u003Cbr \/\u003E\n\u003Cbr \/\u003E\nIn coverage of aquaculture, we tend to focus on the sexier and scarier subjects: pollution from farms, genes mixing with the wild population, PCBs in farmed salmon, etc. Certainily, no doubt, these are all serious concerns (except perhaps the PCBs). But the feed-to-fish ratio is the very core of the matter; if you get less fish protein out than you put in, aquaculture doesn't make a heck of a lot of sense.\u003Cbr \/\u003E\n\u003Cbr \/\u003E\nWalsh gets to this central dilemma in the second half of the article:\u003Cbr \/\u003E\n\u003Cbr \/\u003E\n\u003Cspan style=\"font-size: x-small;\"\u003EWhen producers began raising fish intensively, they picked species that  people like to eat: salmon and sea bass. But those species are high on  the food chain, and raising them on a farm is a bit like trying to  domesticate tigers.\u003Ci\u003E [ed - nice. I always say wolves]\u003C\/i\u003E The aquaculture industry has gotten better at  replacing fish meal with plant-based feed, but not fast enough. You're  not feeding the world sustainably if you need to remove the base of the  marine food chain to do it.\u0026nbsp;\u003C\/span\u003E\u003Cbr \/\u003E\n\u003Cbr \/\u003E\n\u003Cspan style=\"font-size: x-small;\"\u003E\u003Cspan style=\"font-size: small;\"\u003EThe solution that many propose is expanding the use of plant-based products in fish food. That brings it's own complications. For one, salmon certainly didn't evolve eating \u003C\/span\u003E\u003Cspan style=\"font-size: small;\"\u003Esoymeal, cornmeal or wheat, so shifting to a majority plant-based diet will likely involve further genetic engineering, which has supporters and detractors.\u0026nbsp;\u003C\/span\u003E\u003C\/span\u003E\u003Cbr \/\u003E\n\u003Cbr \/\u003E\n\u003Cspan style=\"font-size: x-small;\"\u003E\u003Cspan style=\"font-size: small;\"\u003EAnd second, feeding plant products to fish would add another player in the struggle for the world's productive croplands.\u0026nbsp;\u003C\/span\u003E\u003C\/span\u003E\u003Cbr \/\u003E\n\u003Cbr \/\u003E\n\u003Cspan style=\"font-size: x-small;\"\u003E\u003Cspan style=\"font-size: small;\"\u003EForget food vs. feed. Or food vs. fuel. In the future, it will be a battle of the 4 Fs:\u0026nbsp; food vs. feed vs. fuel vs. fish.\u003C\/span\u003E\u003C\/span\u003E"},"link":[{"rel":"replies","type":"application/atom+xml","href":"http:\/\/simondonner.blogspot.com\/feeds\/6229639297554050788\/comments\/default","title":"Post Comments"},{"rel":"replies","type":"text/html","href":"http:\/\/www.blogger.com\/comment.g?blogID=25163458\u0026postID=6229639297554050788\u0026isPopup=true","title":"2 Comments"},{"rel":"edit","type":"application/atom+xml","href":"http:\/\/www.blogger.com\/feeds\/25163458\/posts\/default\/6229639297554050788"},{"rel":"self","type":"application/atom+xml","href":"http:\/\/www.blogger.com\/feeds\/25163458\/posts\/default\/6229639297554050788"},{"rel":"alternate","type":"text/html","href":"http:\/\/simondonner.blogspot.com\/2011\/07\/farming-sea.html","title":"Farming the sea"}],"author":[{"name":{"$t":"Unknown"},"email":{"$t":"noreply@blogger.com"},"gd$image":{"rel":"http://schemas.google.com/g/2005#thumbnail","width":"16","height":"16","src":"https:\/\/img1.blogblog.com\/img\/b16-rounded.gif"}}],"media$thumbnail":{"xmlns$media":"http://search.yahoo.com/mrss/","url":"http:\/\/1.bp.blogspot.com\/-YC7J71X4E40\/ThkOor8n18I\/AAAAAAAACwk\/67tPzmnXNeY\/s72-c\/Untitled.png","height":"72","width":"72"},"thr$total":{"$t":"2"}}]}});