Profits soar at Amerisur

South America-focused oil and gas producer Amerisur Resources yesterday reported a nearly 500 per cent rise in full-year profit helped by a steep increase in production. Operating profit rose to £19.6m in the year, from £3.3m a year earlier. Revenue grew almost 200 per cent to £42.2m. Shares in the Aim-listed firm fell 4.8 per cent, however.