Piranhas are normally about 14 to 26 cm long and have a single row of sharp teeth in both jaws; the teeth are tightly packed and interlockingand used for rapid puncture and shearing.
Serrasalmus rhombeus (Redeye Piranha, and see below), is a fish of the piranha family Serrasalmidae found in South America in the Amazon and Orinoco river basins, the north and eastern Guiana Shield rivers, and northeastern Brazilian coastal rivers. Its length is up to 41.5 cm. Fish
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