(Portland, OR)  --  Officials at the Oregon Zoo say Julius, a 26-year-old sea lion, has been euthanized.  The zoo says Julius was put down yesterday because of complications related to his advanced age.  The sea lion was brought to the Portland zoo from the Mystic Aquarium in Connecticut in 2000.  At the time of his death, he was the oldest male Stellar sea lion in captivity in the U.S.