Taipei: The Taiwan Stock Exchange's main index opened down 136.91 points at 27,310.40 Tuesday on turnover of NT$7.69 billion (US$246 million).According to Focus Taiwan, the decline in the index reflects market reactions and investor sentiments at the start of the trading day. The opening figures indicate caution among investors, potentially influenced by current economic conditions or external market factors.The reported turnover of NT$7.69 billion highlights the volume of trading activity during the opening session. This figure provides an insight into the level of investor engagement and market liquidity as the trading day commenced.