Good news for all you seafood lovers. Barton Seaver, chef of the acclaimed Hook, has opened Tackle Box. This new joint not only shares the same block of Georgetown as Hook, but it also shares Seaver’s dedication to sustainable seafood. But in a more casual setting. From the Web site, the reasoning for opening a second place: “We like summer vacation at the beach. That’s why we decided to open a lobster shack in the middle of the city for those days we couldn’t make the drive.” The menu includes such things as clam chowder, oysters, a “Maine Meal,” which includes one fish, two sides, and a sauce, and, of course, rolls. And who doesn’t love a good lobster roll? Has anyone made it over to M Street to try out the new grub?