Zebrafish (IMAGE) University of Utah Health Caption The tropical fish, zebrafish, is a popular model for understanding human health and disease. 70% of their genes are the same as in humans and they have the same major organ and tissue systems. Credit Charlie Ehlert, University of Utah Health Usage Restrictions Use with credit License Original 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.