The state Division of Marine Fisheries yesterday expanded closed shellfish areas to include the eastern side of Nantucket Sound due to red tide. The closure does not affect fish or shellfish harvested and landed in Vineyard waters.

The agency sent out the notification for the benefit of shellfishermen and fish markets that sell shellfish wholesale and retail. Affected shellfish include surf clams, ocean quahaugs, mussels, carnivorous snails and whole sea scallops. Those scallops are exempt if only the adductor muscle is landed.

The bloom of toxic red tide that closed shellfish beds from Maine to Nantucket spared the Vineyard this week, fading off the eastern shore of Chappaquiddick into Nantucket Sound.

Shellfish samples taken on Monday in Oak Bluffs, Menemsha and Edgartown came back clean in two separate rounds of testing, so no ponds were closed on the Vineyard, despite vague reports in the mainland print press of closures in Edgartown.

The conch fishery in Nantucket Sound has been closed.