Black bass have not always lived in the Delaware River. You might think they're a native species, but they're not. They were introduced to the river by Thaddeus Norris, an 18th-century angler and fly-rod maker, and a group of anglers from Easton and Philadelphia.
Norris (1811-1877) wrote The American Angler's Book (1865) and was a successful Philadelphia merchant. Though his book didn't cover black bass fishing, it was probably the most important fishing title published in the United States to that time.