DUBAI, Sept 16 (Reuters) - Aluminium Bahrain (Alba) may look into an additional listing of its shares in Saudi Arabia, in what would be the latest blow to Bahrain's stock market which has suffered from low trading volumes since the financial crisis. Such a move would also emphasise the draw of Saudi Arabia's bourse, which is by far the largest in the Gulf Arab region and is in the spotlight ahead of opening up to foreign investors for the first time in 2015. Alba said in a bourse filing it might conduct a review into an additional listing in Saudi Arabia, but that ** decision had been taken. ...