Gravel (IMAGE) Norwegian University of Science and Technology Caption Eggs and fry are left high and dry in the gravel bed, and fry are caught in puddles when the riverbed around them dries out. Credit Photo: Steven Philip Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. License CC BY-NC 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.