Forage fish like these at a Chilean processing plant are often used for fish meal used in aquaculture. But critics consider this inefficient and wasteful and worry it could deplete fish populations. Now several companies are developing protein substitutes to replace fish meal.
Julio Etchart/ullstein bild via Getty Images
In Iraq, masgouf is part of the national cuisine, but it's getting harder to find as the country still reels from war, sanctions, water quality and economic problems.
Sabah Arar/AFP/Getty Images
In trying to get people to eat the Pez Diablo, or suckermouth catfish, sustainable fisheries specialist Mike Mitchell says it isn't "a problem of biology or science, but marketing."
Washington has eight Atlantic salmon net pens. There are two types: commercial net pens for raising Atlantic salmon and enhancement net pens for wild salmon that will eventually be released.
Robert F. Bukaty/AP
Sturgeon fisherman Bill Ford has filled Ceapa's boat, "Sturgeon Queen," with his morning's catch: a few gillnets full of wild, six- to eight-foot long Atlantic sturgeon from the St. John River.
Courtesy of Cornel Ceapa
In "The Fish on My Plate," author and fisherman Paul Greenberg sets out to answer the question "what fish should I eat that's good for me and good for the planet?" As part of his quest to investigate the health of the ocean — and his own — Greenberg spent a year eating seafood at breakfast, lunch and dinner.
Courtesy of FRONTLINE
Native westslope cutthroat trout swim in the north fork of the Flathead River in northwestern Montana. However, cutthroat trout populations are threatened by hybridization from mating with rainbow trout.
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