Zebrafish (IMAGE) Florida State University Caption Adult zebrafish are about one inch in length and recognized by many as a popular aquarium species. Credit Charles Badland, Program in Neuroscience, Florida State University 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.