You catch the larger ones in the fall. Oct and November. But They do start appearing come May June, when the waters warm up in the summer there still there just in a little deeper water. They come into the shallows at night to feed.
Try out these links
http://www.stripersonline.com/surftalk/
http://njfishing.com/
http://njstriper.com/cgi-bin/ubb/ultimatebb.cgi