Tokyo stocks were lower Friday morning, with sentiment dampened by an overnight fall on Wall Street and weaker-than-expected results from the Bank of Japan’s Tankan business survey released shortly before the market opening. The 225-issue Nikkei Stock Average fell 233.51 points, or 0.88 percent, from Thursday to 26,159.53. The broader Topix index was down 13.33 points, or 0.71 percent, at 1,857.49. On the top-tier Prime Market, decliners were led by mining, electric power and gas, and rubber product issues.