Bluegill (IMAGE) University of Wisconsin-Madison Caption Members of the Lepomis family, like these bluegill in northern Wisconsin's Sparkling Lake show astonishing variability in population densities from year to year, often setting unprecedented records. Credit Gretchen Hansen 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.