sentences:  Amaranth Advisors' troubles began in December 2005 as natural gas prices began to decline and Amaranth Advisors portfolio was structured for the price to move in the spring months of March or April.Hunter who was 32 years old at the time invested heavily in natural gas futures which resulted in a single week loss of $6.5 billion when prices failed to move as expected.On Monday September 18, 2006 Amaranth Advisors told investors that natural gas market downturn had resulted in $3 billion of loses.