Japan's banks logged a combined ¥226 billion in losses due to the U.S. subprime mortgage crisis in the six months to September, the Financial Services Agency said Thursday.

According to an FSA survey, 575 deposit-handling financial institutions in Japan booked ¥119 billion in realized losses and ¥107 billion in unrealized losses in the April-September period because of the subprime loan mess.

During the period, those institutions had ¥1.33 trillion in financial products in book value linked to the poor-credit mortgage loans, including asset-backed securities and collateralized debt obligations.