Parisi Tsakirios, 29, mends a net as he prepares for another fishing trip. "I can't imagine doing any other job, because I love the sea," he says. "But there are hardly any fish. I barely break even. I can't support my family." Joanna Kakissis/NPR hide caption

itoggle caption Joanna Kakissis/NPR

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

Fish for sale in the fish market in Fraserburgh, Scotland. Ari Shapiro/NPR hide caption

itoggle caption Ari Shapiro/NPR

A tray of sardines in Costa Mesa, California, in this November 17, 2014 photo. Plummeting sardine populations force a complete ban on sardine fishing off the U.S. West Coast for more than a year. LUCY NICHOLSON/Reuters /Landov hide caption

itoggle caption LUCY NICHOLSON/Reuters /Landov

A Russian Emergencies Ministry ship is seen through the window of a helicopter during a rescue operation after the Russian trawler Dalniy Vostok sank off the coast of Kamchatka, in the Sea of Okhotsk, on Thursday. Reuters /Landov hide caption

itoggle caption Reuters /Landov

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

A fisherman pulls a basket filled with anchovies aboard a fishing boat off of Peru's northern port of Chimbote, in 2012. Peru is the world's top fishmeal exporter, producing about a third of worldwide supply. Enrique Castro-Mendivil/Reuters/Landov hide caption

itoggle caption Enrique Castro-Mendivil/Reuters/Landov

This Vivace "no-kill" caviar was harvested from a Siberian sturgeon via a massage-based technique. The fish didn't die. But did the taste survive? Alastair Bland for NPR hide caption

itoggle caption Alastair Bland for NPR