October 6, 2015 — Drizzled in butter or slathered in mayo—or heaped atop 100% all-natural Angus beef, perhaps? The question of how you like your lobster roll is no longer the sole province of foodies, coastal New Englanders, and people who summer in Maine. American lobster has gone mainstream, launching food trucks from Georgia to Oregon, and debuting on menus at McDonald’s and Shake Shack.

Unlike almost anything else that gets eaten on a bun, Maine lobster is wild-caught—which typically makes seafood pricier. So how has lobster gone from luxury eat to food-truck treat?

The reason boils down to plentiful supply, plain and simple. In fact, the state’s lobster business is the only fishery on the planet that has endured for more than a century and yet produces more volume and value than ever before. And not just slightly more. Last year, Maine fishermen hauled ashore 124 million pounds of lobsters, six times more than what they’d caught in 1984. The $456 million in value those landings totaled was nearly 20% higher than any other year in history, in real terms. These days, around 85% of American lobster caught in the US is landed in Maine—more than ever before.

Even more remarkable than sheer volume, though, is that this sudden sixfold surge has no clear explanation. A rise in sea temperatures, which has sped up lobster growth and opened up new coastal habitats for baby lobsters, is one likely reason. Another is that by plundering cod and other big fish in the Gulf of Maine, we’ve thinned out the predators that long kept lobster numbers in check. Both are strong hypotheses, yet no one’s sure we really understand what’s going on.

Read the full story at Quartz