Thank You!
Search OCA:
Get Local!

Find Local News, Events & Green Businesses on OCA's State Pages:

OCA News Sections

Organic Consumers Association

Environmental Group Gives First-Time Nod to Sustainable Salmon-Farming Method

  • Sea Change: Environmental Group Gives First-Time Nod to Sustainable Salmon-Farming Method
    An aquaculture company devises a new, sustainable process that raises Pacific coho salmon in freshwater
    By Clare Leschin-Hoar
    Scientific American, January 14, 2010
    Straight to the Source

Farm-raised salmon has long been the poster child of unsustainable aquaculture practices. Issues of escape, pollution and inefficiency have plunged it deeply into the "avoid" territory of environmental groups-until now.

In a report released January 14, the Monterey Bay Aquarium's Seafood Watch program is taking the unprecedented step of approving a particular method for farming Pacific coho salmon that is currently employed exclusively by the Rochester, Wash.-based AquaSeed Corp. The sustainability nod from the consumer education group means that these salmon also will be assigned a green "Best Choice" rating on Seafood Watch's Web site. The approval follows several months of intensive site visits by Seafood Watch scientists and reviews of the company's production facility, feed ratios, fish contaminant and pollution discharge levels, and more.

The salmon, to be sold under the SweetSpring label, have also been shown to contain high levels of omega-3 fatty acids, placing the salmon on Seafood Watch's newly created Super Green List, which denotes that the fish is good for human health without causing harm to the ocean. To appear on the Super Green List, the salmon must provide the daily minimum of omega-3s (at least 250 milligrams per day) based on 28 grams of fish, and have PCB (polychlorinated biphenyl) levels under 11 parts per billion (ppb). AquaSeed came in at 335 milligrams per day of omega-3s and had a PCB level of 10.4 ppb.

"This is the first farmed salmon we've ever talked about as a good source [for food, since the program's inception in 1999]," said Geoffrey Shester, senior science manager for Seafood Watch. "This is extremely exciting. It's not an experimental science project. It is mature to the point where there is real potential to scale it up."

The farming method The AquaSeed Pacific coho salmon are raised in a freshwater, closed containment system, which is not how salmon are conventionally farmed. Salmon in the wild live primarily in saltwater but swim to freshwater every year to spawn. Traditionally raised farm salmon are grown in open-net ocean pens. This has led to problems such as nonnative species escaping into the wild and pollution as well as sea lice infestation and disease, because there is no barrier between captive salmon and the wild version in surrounding waters. Plus, traditionally raised farmed salmon require as much as five pounds (2.3 kilograms) of meal made from smaller fish caught in the wild for every pound (half kilogram) of salmon meat, a level that is considered unsustainable by environmental groups.

AquaSeed's salmon are grown in land-based, freshwater tanks ranging in size from 60 centimeters to 15 meters wide depending on the salmon's developmental stage. Containment tanks prevent escapes and problems with sea lice infestation that have plagued open-net ocean pen operations. Also, a high-end salmon feed and selective breeding has helped minimize fishmeal use, reducing the ratio of pounds of wild feed fish to produce pounds of farmed fish to 1.1 to one-a number AquaSeed owner Per Heggelund says he expects to whittle further.

"What's interesting about this is this is they've taken salmon back millions of years evolutionarily, to the point where they're freshwater again," Shester says.


>>> Read the Full Article

For more information on this topic or related issues you can search the thousands of archived articles on the OCA website using keywords: