Frustration boiled over as a group of commercial shellfishermen confronted the East Hampton Town Trustees Tuesday about the efficacy of the town shellfish hatchery’s annual seeding program, which the trustees help fund. The meeting was marked by multiple angry exchanges and those in the small room in the town’s Lamb Building on Bluff Road, Amagansett, talking over one another. When the shouting was over, all agreed that a survey after the seeding was completed would be in everyone’s interest.