Pacu (Portuguese pronunciation: [paˈku]) is a common name used to refer to several species of South American freshwater fish that are related to the piranha, which are also kept as pets in aquaria. They are popularly thought of as herbivorous. Their teeth, which may look similar to human teeth, are used to cut through vegetation and crush seeds that fall into the water. Pacu and piranha have similar teeth, although the difference is jaw alignments; piranha have pointed, razor-sharp teeth in a pronounced underbite, whereas pacu have squarer, straighter teeth in a less severe underbite, or a slight overbite.[1] Additionally, full-grown pacu are much larger than piranha, reaching up to 30 kg (60 pounds) in weight, in the wild.
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