NEW YORK--(BUSINESS WIRE)--Fitch-rated closed end funds (CEFs) have maintained high levels of asset coverage and passed their respective rating levels throughout the recent jump in market volatility, says Fitch Ratings. The fear of an economic slowdown in China, the expectation of a rate hike from the Federal Reserve and the falling price of oil are affecting equity and bond markets and the net asset values (NAVs) of CEFs. The market's volatility has decreased asset coverage levels associated w