Biologists and lobstermen are growing increasingly worried that the state’s most valuable fishery, which in recent years has boasted record volume and value and accounts for more than 80 percent of Maine’s fishing profit, is about to go bust, a doomsday economic scenario some call the curse of the “gilded trap.” At the center of their concern: The number of baby lobsters found in the Gulf of Maine continues to fall. Scientist are diving deep into the details of the decline, trying to understand what is happening to the baby lobsters, or if changing ocean conditions in the Gulf of Maine mean they aren’t looking for them in the right places anymore.