Ferres, a former CEO at York City Knights and Wakefield, was appointed in the position last July.
However, Ferres has stepped down, citing differences with the club's board over changes that he believes need to be made.
He said in a statement: "As CEO I believe I have a moral obligation to everyone associated to the Tigers from its staff to the players and right through to its loyal fans.
"Since the board is not in a position to support the multitude of changes that I believe must take place now in order for Castleford to continue to compete at Super League level, I feel I have no option other than to offer my resignation.
"I am an extremely proud man and a proud Castleford man at that, so please rest assured that this decision was not made lightly.
"The club requires significant investment in order to continue and I truly hope the board can secure the necessary financial support in the coming months.
"I have informed the board that I am willing to offer my support in an advisory capacity should it be required."
Ferres has been involved in launching a new membership scheme at Castleford during his seven months at the club, with 4,000 fans signing up and season ticket sales also rising by 25%. He hopes this will help the club to push ahead and develop further over coming years.
Ferres added: "I would like to thank the fans for their fantastic support and indeed the staff for their hard work in implementing the new membership scheme. It has brought in much-needed revenue to the club, and in doing so provided a model which can and should be the catalyst to help sustain a viable business."
- Sports & Recreation
- York City Knights