Latin name: Rapana venosa Origin : Black Sea Season : From April To February Calibration : 3L ( Extra Large ) : u - 15 pcs/kg LL ( Extra Large ) : 15 - 20 pcs/kg. L ( Large ) : 20 - 40 pcs/kg. M ( Medium ) : 40 - 60 pcs/kg. S ( Small ) : 60 - 80pcs/kg. SS ( Small ) : 80 - 120pcs/kg. 3S ( Small ) : 120 - uppcs/kg.