PROBLEM TO BE SOLVED: To provide a shellfish stretching hanger for aquaculture that enables resource saving and labor saving in a structure and formation, eliminates deformation, breakage and strain in transport, storage and aquaculture on-site handling, enables stable and easy mounting symmetrically to bus-lines, is suitable for the aquaculture of spats, and greatly reduces detachments.SOLUTION: A shellfish stretching hanger single body for aquaculture is configured sequentially from the tip side to the center direction of a base at one end or both ends in the longitudinal direction of a resin rod-shaped base 3, the shellfish stretching hanger single body that comprises a shellfish holding part 32 having a structure including a tip shellfish hole insertion part 321, a shellfish coming-off prevention part 322 and a shellfish hanging part 323, and a rope stopper part 31 including a structure in which a pair of rope stopper protrusions 311 and 312 across a bus-line are installed symmetrically starting from the base in the central portion of the base while the tips are inclined to the center side, respectively. A base portion of the shellfish holding part is reinforced by stretch orientation. Also, there are provided an aquaculture scallop connection stretching hanger formed by connecting the single bodies, a stretch molding method and a stretch molding device using a split mold.
