Nikkei ended a two-day losing streak with minor gains Tuesday on bargain hunting, while scandal-hit Olympus surged almost 20 percent on reports it will likely remain listed on the Tokyo Stock Exchange. The 225-issue Nikkei Stock Average ended up 31.91 points, or 0.38 percent, from Friday at 8,422.26. The broader Topix index of all First Section issues on the TSE finished up 2.33 points, or 0. 32 percent, at 731.93. Financial markets in Japan were closed Monday for a national holiday. Gainers included the electricity and gas, mining and precision machinery sectors. Decliners included the sea transport, oil and coal products and nonferrous metals sectors. The turnover was about 921.3 billion yen (about 11.99 billion U.S. dollars).