Marine Microplastics Research (IMAGE) University of Delaware Caption Microplastics, small pieces of plastic less than five millimeters long, are an emerging marine pollution issue. Credit Julie Steinberg/ University of Delaware Usage Restrictions Must credit Julie Steinberg/ University of Delaware 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.