Logperch Map (IMAGE) Penn State Caption This map of the lower Susquehanna River shows the original range of the Chesapeake logperch in dark blue. They are mostly gone from that stretch now. The fish was also native to the lower reaches of the Potomac River, but it hasn't been seen there in about 80 years. Credit Penn State Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.