A hybrid striper is a cross between a striped bass (striper) and a white (sand) bass. I don't remember which sex of either is used. At the hatchery, one is stripped for eggs and the other 'milked' for sperm. It is mixed and the result is the hybrid striper. It can occur naturally in rivers but, I understand, is rare. Both parents depend on running water to spawn. My personal experience is that a striper pulls harder but a hybrid actively fights better. Like both parents, it is a schooling fish.