The present invention relates to a net assembly which is used for purse seine fishery, is mounted on a first ship, is put into seawater from an end of the first ship in a longitudinal direction, is towed by a second ship, surrounds groups of fish, and is hauled in, thereby collecting groups of fish. According to the present invention, the net assembly includes: a plurality of buoy units which float on the sea surface to provide buoyancy to the net assembly and are coupled in a spaced manner and in the longitudinal direction of the net assembly; a plurality of net groups which are arranged on the lower parts of the buoy units in an inter-coupled form, are submerged from the sea surface to be deployed, and surround and collect the fish; a weight unit which extends along the lower ends of the net groups to provide a submerging force by means of gravity to submerge the net groups; and a tightening rope which extends along the net groups while being spaced apart from the weight unit in a downward direction and is tightened by the first ship to form a closed space with the net assembly below the sea surface.
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