PORTSMOUTH, N.H. (AP) -- At first, New Hampshire lobsterman Bill Marconi thought he had caught a shiny blue beer can in his trap. It turns out it was a rare, cobalt-blue lobster.

The 52-year-old lobsterman was out hauling 400 traps with his son Wednesday when he snared the 1½-pound lobster in between his dock and the Isle of Shoals, about six miles off the coast.New England Aquarium Research Director Mike Tlusty tells Foster's Daily Democrat only one in 5 million lobsters are blue.

Tlusty said blue lobsters are different in that they are better at processing astaxanthin, an antioxidant with a red pigment derived from algae. The substance bonds with proteins in the lobster's shell, resulting in the blue pigment.

Marconi donated his lobster to the Seacoast Science Center.

Information from: Foster's Daily Democrat, http://www.fosters.com