OYSTER BAY - A group of Nassau shell fishermen have filed a lawsuit against the Town of Oyster Bay and a private company over clam-harvesting areas in the bay. Current law says independent baymen can only harvest clams in certain staked-off areas of Oyster Bay, mostly close to shore. Under an agreement with the town, a private company named Frank M. Flower & Sons leases fishing grounds that other baymen claim are outside of the assigned grounds. The baymen say Flower & Sons is moving the stakes that dictate where clams can be harvested, and that the town is turning a blind eye. A lawyer for the company says the stakes are moved only when they've been shifted by wind and tides. The lawyer says the company has offered to work with the baymen on the issue.