Serrasalmus piraya
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[Photo] by R.Wampers from http://www.zoo.be, piranha fish in the Antwerp Zoo, taken in 02/2004

The fish Serrasalmus piraya (syn. Serrasalmo piraya and Pygocentrus piraya), often called the piraya piranha or San Francisco piranha, is a large, aggressive piranha from Brazil and Peru. It can be found in the Amazon River and Rio S??o Francisco. 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 belly, silver eyes, and rayed fibrous adipose fin. Like most other piranhas, S. piraya is laterally compressed and roughly circular in profile, and bears a mouthful of very sharp teeth. The lower jaw is thick, strong, and protruding.

This fish is an omnivore, but when hungry, stressed, or seeking live food it is very aggressive. This characteristic combined with its large size make it a danger to humans. Piranha attacks on humans are anecdotal for the most part. The piraya prefers to eat small fish and insects, along with seeds and aquatic plant material.

The piraya is sometimes available as an aquarium fish. It is not generally bred in captivity, so aquarium pirayas are usually imported from South America and can be expensive. Any other fish sharing a tank with a piraya should be of the same or a similar piranha species. Other types of fish will be attacked and eaten.

http://en.wikipedia.org/wiki/Serrasalmus_piraya

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