The SeaWolves served as a Pittsburgh Pirates affiliate from 1995 to 1998. In 1999, the Double-A Eastern League added two expansion franchises, with Erie gaining one of them. The team joined the Eastern League after it moved up from the Short-Season A level to the Double-A level. Therefore, the current SeaWolves organization is considered a continuation of the former one even though it changed classes. Minor League Baseball allowed Erie to keep their New York–Penn League records and history as a member of the Eastern League. Subsequently, the Mahoning Valley Scrappers replaced them in the New York-Penn League, which is officially considered an expansion franchise rather than a continuation of the SeaWolves.