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This fish is an omnivore, and has aggressive tendencies when hungry, stressed, or seeking live food. Like most in the Serrasalmidae family, piraya piranhas dental morphology has a major influence for their inclination toward piscivorous and herbivorous behavior. [3]
A piranha or piraña (/ p ɪ ˈ r ɑː n j ə ˌ-r æ n /, or / p ɪ ˈ r ɑː n ə /; Portuguese: [piˈɾɐ̃ɲɐ], Spanish:) is any of a number of freshwater fish species in the family Serrasalmidae, [1] or the subfamily Serrasalminae within the tetra family, Characidae [2] in order Characiformes.
Pygopristis denticulata, also known as the lobetoothed piranha, is a species of piranha. [1] It is a rare South American characiform fish found in the Orinoco River basin, rivers of the northern and eastern Guiana Shield, and tributaries of the lower Amazon River. [2]
Live feedings to captive piranhas can introduce diseases [citation needed], and goldfish contain a growth-inhibiting hormone, which in turn will affect piranhas [citation needed]. Red-bellied piranhas, particularly when juvenile, will sometimes bite one another in the aquarium , normally on the fins, in behavior called 'fin nipping'.
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Pacus generally have more complex and broad teeth while true piranhas have teeth with multiple cusps, well developed serration and strong compression, making them thin and well suited for cutting. Between the three preserved teeth the size varies greatly, with the third being the largest and the fourth the smallest.
Pygocentrus cariba or black spot piranha is a species of piranha endemic to Venezuela and Colombia; specifically, to the Orinoco River basin lowlands and the Llanos region. This species can reach a total length of 27.9 centimetres (11.0 in).
Serrasalmus manueli, the Silver piranha or Manuel's piranha, is one of the largest species of piranha within the genus Serrasalmus.Its size and weight are still yet to be determined but it is safe to say that it reaches around the same size and weight as the black piranha.