Amaranth Advisors, the US hedge fund which this summer settled charges with US regulators relating to its 2006 collapse, has gone on the offensive and is suing a fund now managing a portion of its old assets.

According to documents filed with the Supreme Court of the State of New York, Amaranth is suing Touradji Capital Management, its founder Paul Touradji, head trader Paul Crone, chief financial officer Thomas Dwan and 20 unnamed employees.