CANADA STOCKS-TSX hits 1-week low on Encana slide, European data

* TSX ends down 53.49 points, or 0.42 percent, at 12,721.79 * Seven of 10 main index sectors decline * BlackBerry shares volatile after former co-CEO sells stake * Barrick climbs 2.3 percent after results By Claire Sibonney TORONTO, Feb 14 (Reuters) - Canada's main stock index fell to a more than one-week low on Thursday as energy stocks declined after data showed Europe falling deeper into recession, offsetting a rise in Barrick Gold Corp as investors found a silver lining