shares of canadian natural resources ltd cnq slipped 445 to c7797 tuesday in what proved to be an allaround negative trading session for the canadian market with the sptsx composite index gsptse falling 101 to 2040756 canadian natural resources ltd closed c995 short of its 52week high c8792 which the company achieved on may 31st trading volume of 30 m shares remained below its 50day average volume of 72 m