UPDATE 3-Toronto stocks retreat as profit-taking hits oils

(Adds details, quotes)

*Market retreats from Monday's record high

*Profit-taking hurts energy shares

*Rona falls after reports drop in profit

By Leah Schnurr

TORONTO, May 13 (Reuters) - The Toronto Stock Exchange's main index fell back from a record high on Tuesday, weakened by retreating oil and gas shares as investors took the opportunity to lock in profits.

The heavyweight energy sector eased 0.5 percent despite yet another record high for crude near $127 a barrel after Iran said it was studying a plan to cut oil output.

Husky Energy (HSE.TO: Quote, Profile, Research, Stock Buzz) fell C$1.65, or 3.2 percent, to C$50.19, and Imperial Oil (IMO.TO: Quote, Profile, Research, Stock Buzz) was down C$1.36, or 2.3 percent, at C$57.94.

"I think overall we're just really seeing a bit of a blowoff from yesterday," said Michael Sprung, president at Sprung & Co. Investment Counsel. "Our view would be that these highs aren't sustainable given the weakness in the underlying economy."  Continued...