JAPAN'S Nagashiki Shipping said on Friday the grounding of one of its large bulk carriers that caused an ecological disaster in Mauritius was due to a lack of safety awareness and a failure to follow rules as it pledged better training and oversight. The findings were assumptions based on interviews with crew members, the company said. A bulk carrier owned by Nagashiki and chartered by Mitsui OSK ran aground on a reef in Mauritius in July and began leaking oil, causing an ecological disaster in the pristine seas around the Indian Ocean island. Four people died when a tug sank…