High Hat (IMAGE) University of Washington Caption A High-hat fish is placed in a plastic bag for half an hour during fieldwork in The Bahamas. Scientists measured the nutrient content in the water before and after to determine the fish's nutrient output. Credit Jacob Allgeier Usage Restrictions With 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.