A combination of warm weather and good conservation techniques has led to what could end up being a record lobster harvest across Maine waters. The glut is particularly noticeable in Stonington, a fishing village on an archipelago by the Atlantic Ocean that has more lobster “landings,” or catches, than anywhere in the state. But the bounty has come with a downside for fishermen. A relatively warm winter prompted soft-shell lobsters to appear in June, about a month early, and their abundance turned into an overabundance. That caused a huge backup in the sea-to-table supply chain. And for the fishermen, the law of supply and demand has forced the price down to a 40-year low.