Miami-Dade County Manager George Burgess said construction bonds for the Florida Marlins’ new $515 million baseball stadium will go out around Opening Day next spring. While it’s too early to devise a definitive timeline, Marlins spokesman P.J. Loyello said the process will continue despite the disruption of the credit markets. County commissioners must approve five stadium agreements. They OK’d a preliminary pact with the team and the City of Miami in February that required that subsequent contracts be set by July.