the bullhead is the catfish that's native to our area and you'll find them in most bodies of water. ~12" is a pretty typical size but they can get a lot bigger.
http://www.state.nj.us/dep/fgw/fish_bullhead.htm
to target bigger fish you probably want to be going after channel cats at one of the places the state puts them in
http://www.state.nj.us/dep/fgw/fish_ch_cat.htm
here's the full list of places they stocked for channels last year
http://www.state.nj.us/dep/fgw/pdf/f...king_chc15.pdf
good luck out there!
