Smarter Living: Shopping Wise

Shrimp

Ask: Where is it from?

Domestic shrimp is generally better than imported varieties. But wild U.S. shrimp are caught with trawl nets that can also catch and kill lots of other marine life.

Concerns

Most imported shrimp are farmed in Asia or Central America, where they were likely treated with chemicals or antibiotics and grown in their own raw sewage. These shrimp are often raised in unsealed pools or mesh cages in the ocean, and the contaminants are allowed to flow in and out of the water, polluting the sea.

Imported wild shrimp also have issues. They were most likely caught with trawling nets that clear-cut the ocean floor, catching and killing endangered or overfished species such as sea turtles.

Best choices

• Spot prawns from Canada and northern U.S. waters
• Wild-caught northern shrimp
• MSC-certified northern pink shrimp (rare in restaurants but can be found in some grocery stores and fish markets)

Canned Tuna

Ask: What kind is it?

All species of tuna have health and sustainability issues. Many scientists fear they are on the path to depletion. While there is no good tuna choice, some species are doing better than others. Varieties of albacore and skipjack tuna are the best choices.

Concerns

Ninety percent of the ocean's large predators, including tuna, have disappeared due to overfishing. And most canned tuna, even dolphin-free brands, is caught using destructive practices.

Tuna also has high levels of mercury. Because of its popularity, it is the biggest source of the toxin in humans.

Best choices

The best choice is to avoid tuna altogether until they are given the chance to recover. But if you can't completely cut it out of your diet, here are a few options that are better than others:

• MSC-certified albacore West Coast tuna
• Canned light albacore tuna, especially if it's pole-and-line caught
• Canned "light" tuna, especially skipjack, which is smaller and more abundant than other tuna and contains less mercury

Salmon

Ask: Where is it from?

Nearly all Atlantic salmon is farmed, and many wild Pacific salmon fisheries have been shut down due to concerns about habitat loss and unsustainable water management. Wild Alaskan salmon is more plentiful, though, and Alaska does a better job of using sustainable fishing practices.

Concerns

Industrial farmed salmon presents significant health concerns because it contains up to 10 times the amount of pollutants and chemical toxins as wild salmon. The fish are also given antibiotics and color additives to make them look appetizing. Salmon farming also can have major adverse effects on the environment.

Best choices

• Sustainably fished wild Alaskan salmon (it's also available in cans)
• If you can only find farmed salmon, look for fish that has been certified by the Marine Stewardship Council and carries an MSC blue sticker. Whole Foods has some of the highest standards for farmed salmon in the industry.

Pollock

Ask: Am I eating it now?

You may not think you eat much of this fish, but that's because it's often not labeled. Pollock is used in imitation crab meat, fast food fish sandwiches and frozen fish sticks.

Concerns

Recent science has indicated that pollock are declining, and fishery managers have cut back the amount of fish that can be harvested as a result. Further reductions may be necessary.

Best choice

• Wild-caught pollock makes an OK seafood choice, though there are some concerns about the ecosystem impacts in local areas where depletion has occurred.

Tilapia

Ask: Where is it from?

Tilapia is native to the Nile River in Africa, so it is rare to encounter wild tilapia.

Concerns

Most tilapia is farmed in Asia, where it is treated with antibiotics and pesticides and exposed to carbon monoxide. Tilapia often contains an artificial male sex hormone that is absorbed by humans when eaten. Because male tilapia grow faster and are more lucrative than females, the fish are often treated with the hormone to induce a sex change.

Best choice

• U.S.-farmed tilapia is the best option because it has higher standards and fewer contaminants. It may still be treated with antibiotics and pesticides, but that practice is less common in America than in Asia.