The invention relates to a mooring buoy system for releasably connecting one or more risers and anchor lines to a turret of a floating structure, wherein the buoy comprises: a buoyant body for carrying the one or more risers, which extend to a subsea hydrocarbon well; a number of anchor line connectors, for connecting a number of anchor lines to the buoyant body such that each anchor line has oneend connected to one of the connectors and the opposing end is connected to the seabed; and a reconnection wire, characterized in that the reconnection wire runs through a channel coinciding with a center line of the buoyant body, and is connectable to each of the anchor lines below the buoyant body at some distance from the anchor line connectors through anchor line connection sections on one endand comprises a stopper and winch wire connection arrangement on the other end, situated on the opposite side of the buoyant body from where the anchor line connectors are connectable.The invention further relates to a method for pulling up one or more risers and a number of anchor lines, for releasably attaching the risers (3) and anchor lines (4) in a turret (150) of a hull (200) of a vessel. The invention further relates to a method for constructing a mooring buoy.