OCF provides oyster farmers with the use of intertidal and deep-sea. The modular design of OCF can be flexibly combined according to the terrain, season, and field to have various usages. The oyster string can be switched between the vertical and horizontal type just by simply binding or removing the rope. Besides, farmers tie OCF to the back of the ship and take it to the sea for culturing or take the harvested oysters back to the factory without spending too much manpower. By rotating the side of the OCF, the strings of oysters are pulled out of the water surface easily by applying buoyancy.