CANADA STOCKS-TSX retreats as oil prices slide, global demand for stocks ebbs

By Nichola Saminather TORONTO, Feb 13 (Reuters) - Canada's main stock index edged lower on Tuesday with losses led by industrials and energy companies, as oil prices fell and appetite for global stocks faltered. * The Toronto Stock Exchange's S&P/TSX composite index opened down 35.7 points, or 0.23 percent, and was trading 39.72 points, or 0.26 percent, lower at 15,202.16 at 09:51 a.m. EST (1451 GMT). * On Monday, the index posted its biggest one-day gain since Jul