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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].
Piranhas have also been discovered in the Kaptai Lake in southeast Bangladesh. Research is being carried out to establish how piranhas have moved to such distant corners of the world from their original habitat. Some rogue exotic fish traders are thought to have released them in the lake to avoid being caught by antipoaching forces.
The breeding habits of piranhas in nature are mostly unknown, with most spawning research being done in aquariums. [21] Piranhas are usually able to breed by the time they are one year old. Female piranhas will lay several thousand eggs near water plants, onto which the eggs stick. The males then fertilize the eggs.
A photo shows a male specimen of one of the new species, which are externally identical.
Piranhas are attracted by splashes of water and the smell of blood. Particularly dangerous for the human are four species of large piranhas, two of which are well-known: ordinary piranha (Rooseveltiella nattereri) and big piranha (Pygocentrus piraya). After being placed into aquarium, they loose their aggressiveness".
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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.