Early in the war, the No. 4 gun and the aft torpedo tubes were removed in exchange for four depth charge throwers and 18 depth charges. In addition 10 license-built Type 96 light AA guns were installed.Whitley, pp. 189–90 These changes increased their displacement to . Survivors had their light AA armament augmented to be between thirteen and twenty 25 mm guns and four Type 93 anti-aircraft machineguns by June 1944. These changes reduced their speed to .
