Chris Tremblay, a member of the Passive Acoustics group at NOAA's Northeast Fisheries Science Center, deploys an underwater recording device along the Eastern Seaboard to listen for the mating sounds of Atlantic cod. Courtesy of Chris Tremblay hide caption

itoggle caption Courtesy of Chris Tremblay

Pacific bluefin tuna for sale for $2.99 per pound at the fish market in San Diego. That shockingly low price does not reflect the deeply threatened state of the bluefin population. Clare Leschin-Hoar for NPR hide caption

itoggle caption Clare Leschin-Hoar for NPR

Pacific Halibut caught in Cook's Inlet, Alaska. via Wikimedia hide caption

itoggle caption via Wikimedia

A school of vermilion rockfish. After being depleted decades ago by overfishing, rockfish — a genus of more than 100 tasty species — have made a remarkable comeback. Donna Schroeder/From 'Probably More Than You Want to Know About the Fishes of the Pacific Coast'/Courtesy Milton Love hide caption

itoggle caption Donna Schroeder/From 'Probably More Than You Want to Know About the Fishes of the Pacific Coast'/Courtesy Milton Love

Fish on ice in Palau Misa Island, Indonesia. Thanks to satellite data, John Amos of SkyTruth can track fishing activity near the Pacific island nation from his office in West Virginia. Randy Olson/National Geographic/Getty Images hide caption

itoggle caption Randy Olson/National Geographic/Getty Images

The IUCN says the Atlantic bluefin tuna is endangered. Its stocks have declined globally between 29 percent and 51 percent over the past 21 to 39 years, according to the conservation group. Tono Balaguer/iStockphoto hide caption

itoggle caption Tono Balaguer/iStockphoto

A crab pot full of snow crabs, fished out of the Bering Sea. Josh Thomas /Courtesy of WWF hide caption

itoggle caption Josh Thomas /Courtesy of WWF

Fishermen Ed Stewart (left) and Tannis Goodsen mend groundfishing nets on Merrill Wharf, in Portland, Maine, last November. Robert F. Bukaty/AP hide caption

itoggle caption Robert F. Bukaty/AP

An earlier spring in Montana's Glacier National Park means full waterfalls at first — but much drier summers. Robert Glusic/Corbis hide caption

itoggle caption Robert Glusic/Corbis

The Mokelumne Wilderness is located in the Sierra Nevada mountains, east of Sacramento, Calif., and south of Lake Tahoe. Mike Vilhauer spent five days lost in the region after he walked away from his campsite to look for fishing bait. Sebastian Werner/Flickr hide caption

itoggle caption Sebastian Werner/Flickr

Nearly everyone fishes for a living on Laos' Don Sadam Island, near the site of the controversial Don Sahang dam. Locals and environmentalists alike are worried about the dam's effects on fish migration. Michael Sullivan/NPR hide caption

itoggle caption Michael Sullivan/NPR

Paul Greenberg says the decline of local fish markets, and the resulting sequestration of seafood to a corner of our supermarkets, has contributed to "the facelessness and comodification of seafood." J. Scott Applewhite/AP hide caption

itoggle caption J. Scott Applewhite/AP

A tuna fishing boat drags a cage of nets on the Mediterranean sea in 2010. (The Mediterranean is not considered to be part of the "high seas.") Andreas Solaro/AFP/Getty Images hide caption

itoggle caption Andreas Solaro/AFP/Getty Images

Pacific Or Bust: Fingerling Chinook salmon are dumped into a holding pen Tuesday as they are transferred from a truck into the Sacramento River in Rio Vista, Calif. From here, they'll be towed downstream for a bit, then make their own way out to the Pacific Ocean. Justin Sullivan/Getty Images hide caption

itoggle caption Justin Sullivan/Getty Images

Cannonball jellyfish soak up the sun on a South Carolina beach. Fishermen are now pursuing the pest that used to clog their shrimping nets. Courtesy of Steven Giese hide caption

itoggle caption Courtesy of Steven Giese

Students prepare fish cakes that will be part of a free dinner offered at Parkside Neighborhood Center in Portland, Maine. Courtesy of Samantha Laster hide caption

itoggle caption Courtesy of Samantha Laster

A sperm whale entangled in a drift net. A report says commercial fisheries around the world kill or injure 650,000 mammals a year. Alberto Romero/Marine Photobank hide caption

itoggle caption Alberto Romero/Marine Photobank

With local cod so scarce, Chef Toby Hill of Lyric Restaurant in Yarmouth Port, Mass., tries out a dogfish salad — served here with garlic aioli on toast — instead. Dogfish is still plentiful in New England waters, but wholesale fisheries say there's not much demand for it in the U.S. Christine Hochkeppel/Courtesy of Cape Cod Times hide caption

itoggle caption Christine Hochkeppel/Courtesy of Cape Cod Times

Migrant workers from Myanmar return to a trawler after unloading fish following a fishing trip in the Gulf of Thailand in Samut Sakhon province Tuesday. A new report details "deceptive and coercive" labor practices in the Thai fishing sector, which relies heavily on workers from Cambodia and Myanmar, also known as Burma. Sakchai Lalit/AP hide caption

itoggle caption Sakchai Lalit/AP