There was one on brown avenue. A fisherman hooked it and was trying to reel it in for 2 hours or so and then it broke the line. It was a thresher, probably about 5 feet or so and it decided to patrol between the jettys for most of the day while it recovered. Instant crowd control until the lifegaurds kicked everybody out of the water around 10oclock...and didn't let anybody in the water until after they left.
There are always sharks around in new jersey, especially threshers and brown sharks. They are absolutly harmless.