Cage farming apparatus

A cage farming apparatus comprising:

• a buoy configured to float on a surface of a sea;
• a central structure configured to be seated on a bottom surface of the sea and to be connected to the buoy by a lifting rope;
• a floating means formed around the lifting rope 40, and configured such that a material having a specific gravity smaller than that of seawater is injected thereinto and thus it is lifted along the lifting rope due to buoyancy or such that seawater is injected thereinto and thus it is lowered along the lifting rope due to a load;
• an auxiliary structure configured to be located on the bottom surface of the sea and to be spaced apart from the central structure by a predetermined distance;
• a cage net configured to be located above the auxiliary structure and to be connected to the floating means by a connecting rope;
• pulleys and formed on the central structure and the auxiliary structure, and configured to guide the connecting rope through its movement so that the cage net is lifted to or lowered from the surface of the sea in response to lifting or lowering of the floating means;
• and
• a cage protecting net configured to be fastened to the auxiliary structure and to accommodate the cage net therein, and adapted such that an upper end thereof is closed and opened to allow the cage net to be removed to an outside and a lower end thereof is knotted by a knotting element through which the connecting rope passes.