Seeker, the wooden scow hand-built on Martha’s Vineyard over more than a decade by owner Ted Box and hundreds of volunteers, sank in Lake Tashmoo earlier this month and remains mostly submerged.

Chip Chop, the 20-acre waterfront estate at the entrance to Lake Tashmoo owned for decades by television journalist Diane Sawyer, was sold today. The buyer was not disclosed, but it is believed to be real estate investor David Malm, who is listed as manager of an LLC associated with the sale.

In order to comply with revised state and federal shellfish sanitation rules, the anchorage area along the pond’s boundary with Oak Bluffs has been expanded to about 50 acres. The area will be closed to all shellfishing from April through October.

Chip Chop, the richly storied waterfront estate built by stage actress Katharine Cornell that has graced the entrance to Lake Tashmoo in Vineyard Haven for nearly 80 years, goes up for sale today.

The Tisbury select board voted unanimously Wednesday to impose an immediate moratorium on anchoring in Lake Tashmoo until the town has developed a policy to reduce the number of visiting boats.