the guy who said something like "where can you not catch them?" i think is right on target.
i grew up in monmouth county about 2 miles from the ocean.
when we were kids, we used to catch snapper blues all summer and into the fall, just casting from the jetties. and bigger blues especially in september and october, right in the surf.
i live in va now, but i go back to nj quite often, especially in the summertime.
starting around may, and lasting until october, you can slay the blues at the shrewsbury rocks, near monmouth beach/sandy hook. it's not great every day, but that's a good area to find them consistently. (boat fishing)
i worked on a charter boat for 6 months in 1994, and we fished for blues from june through september. it was a rare trip that
produced a shutout. (now that i think about it, i don't think we had any shutouts - usually, it was TONS of blues!) we fished from belmar north to sandy hook, mostly ...
this past summer, i think it was august, i was out at the "mud hole" on my brother's boat with our dad, and we were into them (and the daggone dogfish!) shortly after setting up our chum slick.
the mud hole seems to be a consistent producer over the summer, although it's a good 15 or so miles offshore, depending on where you fish.
so, long story short, i think you can find blues anywhere off the jersey coast, i guess read your local paper (the asbury park press has good fishing reports every friday!) or eavesdrop your boat radio for what the charter captains are saying, but i can pretty much guarantee you'll catch some blues off the jersey coast!!!