Alaska lawmakers are considering legalizing hatcheries to boost wild shellfish stocks like king crab and mussels. It’s an idea that’s been around since at least the 1990s , and the goal would be to replicate the economic success of Alaska’s enhanced salmon fisheries. But some scientists say they’re worried about what hatchery crab and other species could do to natural populations. Throughout Alaska’s waters, shellfish populations have been in decline for decades — decimated by overfishing in the