Grass puffer fish (IMAGE) Nagoya University Caption Puffer fish are famous for having a lethal toxin called tetrodotoxin. Research found a non-toxic version of tetrodotoxin that is used to find and eat other animals that contain tetrodotoxin to become toxic and to attract other puffer fish. Credit Dr Hideki Abe Usage Restrictions Credit must be given 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.