abstract:The fish Pygocentrus piraya often called the Piraya Piranha or San Francisco Piranha, and sometimes sold as the, Man Eating Piranha is a large, aggressive piranha from the São Francisco River basin in Brazil. It is one of the largest piranhas, reaching a maximum length of 50 cm in the wild, and is sometimes considered the most beautiful, with its orange to yellow belly coloration, silver eyes, and rayed fibrous adipose fin.