Increasingly, however, what is glittering in this community of 200, with an economy that depends more now on whale-watching than its once-vibrant­ shipbuilding and fishing industries, has nothing to do with sightseers or lobster traps.

Instead, it is coming from the commercial potential of the high-powered tides that surge past the island from the Gulf of Maine into the Bay of Fundy and back twice a day.

Regional