(Reuters) - Canada's main stock index fell at the open on Friday as energy shares slipped, tracking a decline in oil prices after China unveiled more retaliatory tariffs against U.S. goods, intensifying a bitter trade dispute.
* At 9:31 a.m. ET (1331 GMT), the Toronto Stock Exchange's S&P/TSX composite index .GSPTSE was down 28.5 points, or 0.18%, at 16,224.96.