SIPAYIK, Maine—Clams have been entwined with the story of the Passamaquoddy tribe for 13,000 years. Archaeological digs at ancient tribal sites have uncovered “middens,” or piles of discarded clamshells from generations of summer harvests, according to tribe member Brian Altvater. But the population of adult softshell clams in the waters around the Sipayik peninsula have […]