TOKYO, Aug. 7 (Xinhua) - The benchmark Nikkei stock index closed lower for a fourth straight day Wednesday, as the strength of the yen weighed on investor sentiment amid ongoing concerns about global trade issues.

File photo: VCG

The 225-issue Nikkei Stock Average lost 68.75 points, or 0.33 percent, from Tuesday to close the day at 20,516.56.

The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, added 0.70 point, or 0.05 percent, to finish at 1,499.93.

Metal product, farm and fishery, and iron and steel-linked issues comprised those that declined the most by the close of play.