NEW YORK--(BUSINESS WIRE)--Depressed oil prices have led to lower valuations on energy-related investments within the portfolios of 10 Fitch-rated business development companies (BDCs), says Fitch Ratings. Oil, gas and other energy exposures, while pressured based on fourth-quarter loan marks, remain manageable relative to Fitch's ratings expectations for BDCs. However, heavy exposure to energy-related investments did contribute to one BDC's Outlook being revised downward last month. For the gr