Tokyo stocks opened mixed Tuesday as tech shares tracked overnight declines by their U.S. counterparts and exporter-oriented issues were supported by a pause in the yen’s rise against the U.S. dollar. In the first 15 minutes of trading, the 225-issue Nikkei Stock Average fell 131.25 points, or 0.34 percent, from Monday to 37,978.97. The broader Topix index was up 0.18 point, or 0.01 percent, at 2,661.59. On the top-tier Prime Market, decliners were led by electric appliance and air transportation issues, while mining and marine transportation issues led gainers. At 9 a.m., the dollar fetched 1…