You mean, why isn't there one piranha in the world that's the size of a killer whale because it ate all the other piranhas? Piranha are schooling fish - they live in large groups. Piranhas only eat piranhas if the victims are injured, diseased or otherwise unable to participate fully in the school.
There are no species of vegetarian piranha fish. All piranha species are omnivores and eat both meat and vegetable matter.
Some Piranha species are plant eaters.
the goblacorall
The piranha are listed as abundant species in the Amazon river basin.
The genus is Pygocentrus. i'll tell you the species soon
The small but voracious species of fish is spelled piranha.
It couldn't, piranhas don't have lungs.
Piranha gestation lasts from about four to six weeks depending on the species. A female of many of the species is able to lay over 5,000 eggs at a time.
caminals watersnakes turtels and otters
The female piranha will lay an average of 5,000 eggs. Both parents defend the eggs that more than 90% will survive.
Piranhas do not eat plants. They are carnivores.
there are over 25 spieces and i only know 6