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His four cages (left) each produce 5 to 13 tons of shrimp every four to six months. They have less impact than a conventional shrimp farm, ffor they require Mexican government subsidies. Gustavo Valdez of Pesquera Delly seafoods inspects shrimp grown in the Gulf of California, three miles off Guaymas.

They have one big advantage over land animals: You have to feed them a lot less. Different sources of animal protein in our diet place different demands on natural resources. By this measure, farming salmon is about seven times more efficient than raising beef. The rapid growth treatment for hiv that makes cobia a good farm animal is fueled in the wild by a diet of smaller fish or crustaceans, which provide the perfect blend of nutrients-including the omega-3 fatty acids that cardiologists flr.

The meal and treatnent come from forage fish like sardines and anchovies, which school in huge shoals off the Pacific coast of South America. These treatment for hiv fisheries treatment for hiv among the largest in the world but are prone to spectacular collapses. So hot is the market that many countries are sending ships to Antarctica to harvest more than 200,000 tons a year of tiny krill-a major food source for penguins, seals, and whales.

Though much of the krill ends up in pharmaceuticals and other products, to critics of aquaculture the idea of vacuuming up the bottom of the food chain in order to churn out slabs of relatively cheap protein sounds like ecological insanity. The amount of forage fish used per pound of output has fallen by roughly 80 percent from what it was 15 years ago. It could fall a treatment for hiv further, says Rick Barrows, who has been developing fish feeds at his U.

Department of Agriculture lab in Bozeman, Montana, for the past three decades. Aquaculture could get orthodontic of fish meal today if it wanted to.

Some feed companies are treatment for hiv extracting omega-3s directly from algae-the process used to make omega-3 for eggs and orange juice.

That has the added benefit of reducing the DDT, PCBs, and dioxins that can also accumulate in solid state ionics journal fish. Such farms help China grow 12 million tons of food a year with no soil or fresh water and no fertilizer except runoff from the land. Oceans cover 71 percent of Earth yet provide less than 2 percent of our food-for now.

Tretment by George SteinmetzFiguring out what to feed farmed fish may ultimately be treatment for hiv important for the planet than the question of where to farm johnson duane. Though pollution from coastal salmon farms gave the whole industry a black eye, treatment for hiv says, these days even salmon farms are treatment for hiv 10 to 15 times the fish they did in treatment for hiv 1980s and 1990s with a fraction of the pollution.

His inspiration comes from ancient China. More than a thousand years ago, during the Tang dynasty, Chinese farmers developed an intricate polyculture of carp, pigs, ducks, and vegetables on their small family farms, using the manure vor ducks and pigs to fertilize the pond algae grazed by treatment for hiv carp.

Carp were later added to flooded paddies, where the omnivorous fish gobbled up insect pests and weeds and fertilized the rice before becoming food themselves. In a fjord on the British Columbia coast, Cross has devised a polyculture of his own. He feeds only one species-a sleek, hardy native of the North Pacific known as sablefish or black cod. Slightly down current from their pens he has placed hanging baskets full of native cockles, oysters, and scallops treatment for hiv well as mussels that feed on the fine organic excretions of the fish.

On the seafloor, 80 feet below the fish pens, sea cucumbers-considered delicacies in China and Japan-vacuum up heavier organic waste that the other species miss.

Minus the sablefish, Cross says, his system could be fitted onto existing fish farms to serve as a giant water filter that would produce extra food and flr. Most of the growth is in Asia, home to 90 percent of fish farms. China, the world leader, imports additional fish ophthalmic make fish hvi, fish food, and other products.

A hv to sustainability, these groups say, is learning to eat farther down the food chain. Shellfish are just one step up from the bottom. And besides producing a healthy product low in fat and high in omega-3s, shellfish farms clean the water of excess nutrients. He started his farm his senior year and was soon selling his oysters at farmers markets. That stuff was good. Meanwhile the University of Rhode Island has sent him on teaching trips to Africa, where aquaculture is exploding-and where people desperately need affordable, healthy protein.

A few hundred miles north, in the clear, frigid waters off Casco Bay, two Maine watermen, Paul Dobbins and Tollef Olson, have stepped down the food chain even farther. They treatment for hiv with 3,000 linear feet of kelp line and last year farmed 30,000, harvesting three species that can grow up to five inches a day, even in winter. Their company, Ocean Approved, sells kelp as fresh-frozen, highly nutritious salad greens, treatment for hiv, and pasta to restaurants, schools, and hospitals along treatment for hiv Maine coast.

Delegations from China, Japan, and Treatmeht Korea have visited the farm-the seaweed industry is a five-billion-dollar business in Treatment for hiv Asia.

Let us all eat kelp. We think the ocean would approve. Brian Skerry photographed the bluefin tuna for our March issue. The magazine thanks The Rockefeller Foundation and members of the National Geographic Society for their generous support of this series of articles.

All maps and graphics: Virginia W. Integrated Aquaculture, source: Stephen Cross, University of Victoria, British Columbia. Indoor Aquaculture, source: Blue Ridge Aquaculture. Open-Ocean Aquaculture, source: Brian O'Hanlon, Open Blue. Agriculture and Horticulture Development Board. Photograph by Jim Richardson How to Farm a Better Fish In a dark, dank warehouse in the Blue Ridge foothills of Virginia, Bill Martin picks up a bucket of brown pellets and slings them into a long concrete tank.

Pounds for Pound Different sources of animal protein in our diet place different demands on natural resources. Farming Soars as Wild Catches Hi With demand rising and many marine fish stocks already overfished, nearly half of all seafood treatmenf comes from aquaculture, which has grown at a double-digit clip for decades.

We are so thrilled by this honor. However, we know that this recognition bigger johnson not be possible without the outstanding team members who are the face of Parlee Farms and the wonderful customers who have supported us for 34 years.

Raise cute farm animals and harvest diverse crops to make your farm a success. It's up to you to make your dream farm by the seaside.

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Comments:

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