Amazing article about the decline of world fisheries. Hear the NPR interview also.
Beginning in the 1950s, as their operations became increasingly industrialized–with onboard refrigeration, acoustic fish-finders, and, later, GPS–they first depleted stocks of cod, hake, flounder, sole, and halibut in the Northern Hemisphere. As those stocks disappeared, the fleets moved southward, to the coasts of developing nations and, ultimately, all the way to the shores of Antarctica, searching for icefishes and rockcods, and, more recently, for small, shrimplike krill. As the bounty of coastal waters dropped, fisheries moved further offshore, to deeper waters. And, finally, as the larger fish began to disappear, boats began to catch fish that were smaller and uglier–fish never before considered fit for human consumption.
via Aquacalypse Now.