Brown Bullhead (IMAGE) American Museum of Natural History Caption The brown bullhead (Ameiurus nebulosus) is one of seven native fish species collected by the Canada Department of Fisheries and Oceans from above and below Niagara Falls and used in this study. Credit © Canada Department of Fisheries and Oceans Usage Restrictions Can be used with appropriate credit 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.