Fresh fish fillets for sale in a display case. Concerns over animal welfare have led to changes in recent years in raising livestock. But seafood has been missing from the conversation. One group aims to change that. kali9/Getty Images hide caption

A Russian fish farming operation in Ura Bay in the Barents Sea. Maxim Zmeyev/AFP/Getty Images hide caption

When it comes to pollutant levels, researchers now say where your tuna was caught matters. Tigeryan/Getty Images/iStockphoto hide caption

While the nutritional value of jellyfish chips hasn't yet been measured, chef Klavs Styrbæk says they pair particularly well with fresh veggies, which could earn them a healthy reputation. Courtesy of Kristoff Styrbæk hide caption

Johnny Nicholas, the owner of the Hilltop Cafe, books a dinner concert in the dining room once a month. The bluesman and his wife opened the restaurant in 1980. John Burnett/NPR hide caption

In its prime, the Hero sailed through frigid temperatures and ice-strewn waters in the South Pole. But now it's sinking, leaking oil and threatening Washington's oysters. Molly Solomon/Oregon Public Broadcasting hide caption

Raw fresh fish for sale at a supermarket. Using seafood guides to decide which fish is the most environmentally choice can be difficult when different guides make slightly different recommendations. intraprese/Getty Images hide caption

Anchoveta are processed at a fish meal factory in Lima, Peru in 2009. Peru and Chile have the world's largest anchoveta fishery, making them the world's largest producers of fish for fishmeal. Ernesto Benavides/Getty Images hide caption

Synthetic fibers from fleece jackets could be ending up in rivers, fields and our diet. emholk/iStockphoto/Getty Images hide caption

Concerns about mercury contamination have led many pregnant women to under-consume seafood. So the FDA issued a new chart explaining what to eat and what to avoid. But critics say it muddles matters. stock_colors/Getty Images hide caption

A vaquita caught as by-catch in Baja California, Mexico. Accidental entanglement in fishing gear is one of the biggest threat to this species, which is down to only 60 animals. Flip Nicklin/ Minden Pictures/Getty Images hide caption

An illustration from Lombard's new book, showing a man throwing a cast net into the surf. Leighton Kelly/Courtesy of Heyday hide caption

Herring are delicious, with flaky, mild meat and oil that sizzles on their skin when grilled over a flame. Chefs and ocean advocates have been promoting the environmental and health benefits of eating small fish like this. But the case of the San Francisco Bay's herring shows some of the obstacles to spreading that message. Alastair Bland for NPR hide caption

Chef Michael Cimarusti, of Los Angeles' Providence restaurant, is pioneering the West Coast incarnation of Dock to Dish, a program that hooks up local fishermen directly with chefs. Courtesy of Providence hide caption

A traditional fisherman in La Paz, Mexico, who works with SmartFish brings sustainable seafood to market. SmartFish was one of the competitors in last week's Fish 2.0 competition. Courtesy of Smart Fish hide caption