BUZZ-Encana Corp: Hits 16-year low on ratings downgrade
** Canadian oil and natural gas producer's shares down 9.1 pct at C$4.42
** Shares fall as much as 10.3 pct; hits more than 16-year low
** U.S.-listed shares down as much as 10.7 pct at $3.15
** Cenovus Energy Inc down 2.8 pct at C$14.56; U.S.-listed stock down 2.9 at $10.56
** Moody's downgrades Encana and Cenovus' senior unsecured notes to junk status, citing decline in cash flow due to fall in oil prices
** Encana and Cenovus' ratings downgraded to Ba2 from Baa2
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