Northern Madtom (IMAGE) University of Michigan Caption Northern Madtom (Noturus stigmosus), a venomous catfish species, collected from the Huron River near Ann Arbor, Michig Credit Matthew Ross 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.