LONDON, Oct 29 (Reuters) - Hedge fund managers continued to liquidate former bullish positions in oil last week and for the first time in more than a year clear signs of fresh short-selling emerged. Rising oil production from Saudi Arabia, the United Arab Emirates, Kuwait and Russia has eased concerns about the availability of supplies once U.S. sanctions on Iran are re-imposed in November. At the same time, intensifying fears about a possible global economic slowdown have hit oil prices and equity markets hard over the last three weeks.