Historically, the original stock in a hatchery most likely came from in-basin fish. If one digs into the history, hatcheries have been operational in this state since 1895. It wasn't uncommon for WDF to move eggs between river basins/hatcheries depending on returns and or losses at individual hatcheries. The "pure" stocks of "wild" fish that existed in the 1890s aren't around. There has been a lot of mixing of stocks resulting, in my opinion, composite stocks in all of our river basins.