April 19 (Reuters) - Aluminium stocks held at three major Japanese ports fell about 10 percent to 245,300 tonnes by the end of March from the previous month, trading house Marubeni Corp said on Thursday. Yohohama: 109,200 (Mar. 2018), 121.700 (Feb. 2018). Nagoya 121.100 (Mar. 2018), 135.300 (Feb. 2018), Osaka 15.000 (Mar. 2018), 15.000 (Feb. 2018).