Swordtail Fish Melanoma 2 (IMAGE) Ohio University Caption Swordtail fish can develop dark pigmented melanomas on their tails. Credit Andre Fernandez, Ohio University Usage Restrictions Credit: Andre Fernandez, Ohio University 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.