The present invention relates to a shellfish seed culture facility which allows the culture of initial juvenile shellfish of which height or length is 1 to 30 mm after seed collection of pediveliger larvae in a process of producing shellfish seeds, which are artificial seeds of shell fish, in a cage culture facility in the offshore or in an indoor culture system, more particularly, to a prefabrication type shellfish seed culture facility with an upstream and downstream reciprocal type cage which can be easily installed to a cage culture facility in the offshore or in an indoor culture system; can easily supply foods and oxygen, and process excrements by helping smooth circulation of rearing water through a net; and can easily modify the direction of water flow by the size of the shellfish seeds; can easily replace a cage by the mesh size of the net or the size of the shellfish seeds using a separation mode of the cage; and can minimize a storage volume after using since the culture cage can be folded after separating the cage frame, by arranging prefabricated cage frames which are assembled as a hexahedron frame shape in a waterproof tent-material culture cage of which bottom surface comprises a net, and installing a water steam pipe in an upper-central part inside the culture cage for providing upstream and downstream water flow using pumping or falling down method. Therefore, the mass production of superior shellfish seeds with lower costs can be possible. The facility is optimized to the production of artificial seeds of Bivalvia which requires entity-based single seed production such as Crassostrea gigas.
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