shares of emera inc ema dropped 047 to c5324 thursday in what proved to be an allaround rough trading session for the canadian market with the sptsx composite index gsptse falling 146 to 1960063 emera inc closed c1199 below its 52week high c6523 which the company reached on april 20th trading volume of 950879 shares remained below its 50day average volume of 18 m