AMC :
Sorry about your fish. When stocked at normal rates catfish will most likely not do an adquate job of controlling BG numbers. You do have some options. You could stock BG at lower rates and with feeding get good growth rates on both BG and cats. If BG #'s start to get to big you could add a few female only LMB to help control the #s. Another option is to use hybrid BG with cats ( this is one niche situation where HBG can work). However after a time you will have to add more HBG and cats to offset those taken out as well as natural mortality. You could also use male only BG and cats with just as good results. You could also try cats and RE (redears) which don't reproduce in as high of #s as BG. None of this addresses how many fish you intend to take out which is another factor to account for.
If you can tell us what you would like (pond goals) there are a lot of people on the forum who can help. ewest