Asian shares sagged on Thursday after a retreat on Wall Street and falling crude oil prices rekindled investor anxiety over slowing global growth, while a mixed picture on Chinese manufacturing failed to impress markets. Japan’s Nikkei share average fell 0.4 percent while MSCI’s broadest index of Asia-Pacific shares outside Japan dropped 0.3 percent. In particular, investors have been rattled by the threat of recession in Europe and the Chinese economy cooling to its weakest in over five years in the third quarter. The latest manufacturing read on China did little to allay those concerns.