As Chatham officials announced they were closing all of the town’s East Side beaches, state marine biologists were pulling off the high-tech accomplishment out on the ocean. The first shark was tagged at 9 a.m. near the southern tip of Monomoy Island, off Chatham. A second was tagged at 3:30 p.m. about a mile north of the first – each with a single move. A third was also spotted but not tagged. “They were right around a 1,000 pounds apiece,’’ said Chaprales, a 58-year-old tuna fisherman and lobsterman from Marstons Mills, a village in Barnstable. Chaprales said he had worked with...