CERTIFICATION PURSUANT TO RULE 30A-2(B) UNDER THE 1940 ACT AND SECTION
906 OF THE SARBANES-OXLEY ACT

I, James A. Bowen,  Chairman of the Board,  President and Chief  Executive
Officer of First  Trust/FIDAC  Mortgage Income Fund (the "Registrant"),
certify that:

         1.     The Form N-CSR of the Registrant  (the "Report")  fully complies
                with  the   requirements  of  Section  13(a)  or  15(d)  of  the
                Securities Exchange Act of 1934, as amended; and

         2.     The information  contained in the Report fairly presents, in all
                material  respects,  the  financial  condition  and  results  of
                operations of the Registrant.

Date:    DECEMBER 22, 2008            /S/ JAMES A. BOWEN
     --------------------------       ----------------------------------------
                                      James A. Bowen, Chairman of the Board,
                                      President and Chief Executive Officer
                                      (principal executive officer)


I, Mark R.  Bradley,  Treasurer,  Controller,  Chief  Financial  Officer  and
Chief  Accounting  Officer  of First Trust/FIDAC Mortgage Income Fund (the
"Registrant"), certify that:

         1.     The Form N-CSR of the Registrant  (the "Report")  fully complies
                with  the   requirements  of  Section  13(a)  or  15(d)  of  the
                Securities Exchange Act of 1934, as amended; and

         2.     The information  contained in the Report fairly presents, in all
                material  respects,  the  financial  condition  and  results  of
                operations of the Registrant.

Date:    DECEMBER 22, 2008            /S/ MARK R. BRADLEY
     --------------------------       ---------------------------------------
                                      Mark R. Bradley, Treasurer, Controller,
                                      Chief Financial Officer and Chief
                                      Accounting Officer (principal financial
                                      officer)