Zebrafish Digestion (IMAGE) University of Miami Caption Contractions move food through the digestive system of a normal zebrafish, about 4.5mm in length and 7 days old. The image is magnified almost 20 times. Credit University of Miami 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.