Sea Lamprey, an Invasive Fish (IMAGE) U.S. Geological Survey Caption Invasive sea lamprey prey on commercially important fish species, living off of the blood and body fluids of adult fish. Credit Marisa Lubeck, USGS 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.