The previous lowest figure was 17,686 for a 2-0 victory over Peterborough United on a Tuesday evening in February 2010.
The crowd against Fulham was the smallest for a Cardiff City home league game since May 2008, when 14,469 turned out at Ninian Park to watch the Bluebirds beat Barnsley 3-0 a fortnight before the FA Cup final.
Yesterday's attendance was Cardiff's lowest on the opening weekend of a Football League season since way back in August 1999, when 10,193 saw the Bluebirds draw 1-1 with Millwall in the old Second Division, or League One as it is now known.
Before the current season, Cardiff City had had home fixtures on the opening weekends of six other Football League campaigns since 1999. The attendances for the relevant matches were: 17,403 (v Wycombe Wanderers in 2001), 18,840 (v Stoke City in 2007), 19,749 (v Southampton in 2008), 22,264 (v Scunthorpe United in 2009), 20,573 (v Sheffield United in 2010) and 21,127 (v Huddersfield Town in 2012).
The last time Cardiff had a smaller attendance than yesterday's for their first home league game of a season was a decade ago in August 2005. On that occasion, 15,231 turned out on a Tuesday evening to see the Bluebirds beat Leeds United 2-1 at Ninian Park.
Only Brentford and Rotherham United have so far attracted smaller crowds than Cardiff City on the opening weekend of the 2015/16 Championship campaign (Preston North End are playing Middlesbrough at lunchtime today).
Yesterday's official attendance of 15,429 was 3,628 down on the smallest crowd of the 2014/15 season (19,057 v Blackburn Rovers on a Tuesday evening in February 2015), 5,694 down on last season's average of 21,123 and 7,086 down on the equivalent fixture against Fulham in January 2015, when the official figure was given as 22,515.