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Which canned tuna is healthiest?

Canned light tuna is the better, lower-mercury choice, according to the FDA and EPA. Canned white and yellowfin tuna are higher in mercury, but still okay to eat. Bigeye tuna should be avoided completely, but that species isn't used for canned tuna anyway.

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My recent experience in the canned tuna aisle at the store went something like this: me, immobile, studying the cans and pouches with their shiny labels, wondering which kind of tuna I should be eating again. Albacore? Yellowfin? Does it matter?

Actually, it matters a lot, seafood experts say, given how much canned tuna we eat (2.2 pounds a person annually, according to the National Fisheries Institute). It's one of the three most popular types of seafood in the United States and has been for a decade now (because really, who's to argue with a well-made tuna sandwich)?

But all that demand takes its toll, resulting in overfished populations, a tremendous amount of bycatch—that is, other marine life caught with the tuna—and labor violations against those working in the industry. Combined with the controversial issue of mercury levels in tuna, it's no wonder I blanked out. "The U.S. is the largest market in the world for canned tuna, so we have a lot of influence in how these fisheries operate," says marine biologist John Hocevar, ocean campaign director for Greenpeace USA, which recently released a canned tuna shopping guide. The good news, he says: "We're really happy to see that at this point you can walk into most big supermarkets and find at least one pretty decent canned tuna option, and that wasn't the case even two years ago."

Here's how to tell the decent from the not-so-decent:

Bycatch is a big problem

Most supermarket canned tuna is caught using the purse seine method—basically giant nets cast over schools of fish. The "worst-case scenario" is when the nets are used with floating fish aggregating devices, or FADs, which attract all sorts of sea life, not just tuna, says Carrie Brownstein, global seafood quality standards coordinator for Whole Foods Market. According to Hocevar, tuna fishing kills millions of sharks and hundreds of thousands of sea turtles every year.

There's no one best tuna type

Skipjack (aka light), albacore (aka white), and yellowfin are the most common types of canned tuna. But bycatch and overfishing happen regardless of tuna species, so it's hard to say that one is better, ecologically speaking, than the rest, says Brownstein. Skipjack stocks are generally doing better than albacore in terms of abundance, but albacore populations in some parts of the world are better managed and healthier than others. It just depends. And don't assume that that expensive can of oil-packed tuna means anything other than, well, it's packed in oil rather than water.

So what should I look for?

The easiest thing is to look for "pole-and-line caught" or "troll caught" on the label. This means the tuna was caught one fish at a time, not swept up en masse with other marine life. Another good indicator is the MSC-certified seal. The Marine Stewardship Council assesses specific fish populations and catch methods and how well fisheries are managed, and is considered the most reputable in terms of certification, says Brownstein.

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Can you store oxygen absorbers in ziplock bags?

Remember: Unused absorbers must be stored in an oxygen free environment to preserve their freshness. They cannot be stored in a regular ziplock bag or a Foodsaver type plastic vacuum sealed bag as these methods allow air/oxygen to enter the bag and will ruin your absorbers.

HOW TO STORE UNUSED OXYGEN ABSORBERS AFTER OPENING

After opening a package of oxygen absorbers, the unused absorbers must be placed back into an oxygen free environment as soon as possible to preserve their freshness for future use. One way to store oxygen absorbers is to use a vacuum sealed Mason jar. A Foodsaver with a jar attachment will vacuum seal the absorbers into a glass Mason jar. This creates an oxygen free environment to preserve your absorbers for future use. Another way to store absorbers is to use a mylar bag. Sealing your absorbers in a mylar bag will allow them to be stored in a closed, oxygen free environment. A third way to maintain the freshness of your oxygen absorbers is to re-heat seal them into their original packaging. This method is less ideal as a heat seal can burn a small hole in the bag which will allow oxygen to enter the bag and ruin your absorbers. Remember: Unused absorbers must be stored in an oxygen free environment to preserve their freshness. They cannot be stored in a regular ziplock bag or a Foodsaver type plastic vacuum sealed bag as these methods allow air/oxygen to enter the bag and will ruin your absorbers.

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