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Most species are restricted to a single river system, but some (such as the red-bellied piranha) occur in several. Many species can occur together; for example, seven are found in Caño Maporal, a stream in Venezuela. [9] Aquarium piranhas have been unsuccessfully introduced into parts of the United States. [10]
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'. Those that ...
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].
While studying piranhas and pacus in an effort to better assess vital fish biodiversity in the 4,000-mile-long (6,400-kilometer-long) river, an international team of researchers has found and ...
The black piranha is the largest species of piranha. It has a distinctively, rhombus-shaped body, solidly coloured from grey through to nearly black. Whatever the body colour, this species has red eyes. The colour of juveniles can be more mottled than in adults.
Like other piranhas, it is found in freshwater, [1] with specimens of this species typically found in acidic clearwater or blackwater environments. Despite their ferocious reputation, many piranhas have broader diets; [1] this species usually feeds on aquatic insects, small fish, and fruits. [3]
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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).