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Piranhas will often scavenge, [9] and some species such as Serrasalmus elongatus are specialized scale-eaters, feeding primarily on scales and fins of other fish. [3] Scale- and fin-eating is more widespread among juvenile and sub-adult piranhas. [20] Piranhas lay their eggs in pits dug during the breeding season and swim around to protect them.
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].
To emphasize the diversity of diets, authors commonly highlight the fruit- and leaf-eating pacus and the highly carnivorous piranhas. Most in the family other than piranhas are primarily herbivorous. In contrast, piranhas have been long believed to be strict carnivores. [4] Many species change diets depending on age and resource availability. [4]
Red-bellied piranhas do not stay in groups in order to pack-hunt for larger animals, but instead group for protection against predators. Foraging methods vary throughout the different stages of a piranha's life. Smaller fish will search for food during the day, while larger fish will forage at dawn, in the late afternoon, and in the early evening.
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Overweight people tend to underestimate the amount of food they eat, and underweight people tend to overestimate. In fact, overweight people tend to have faster metabolic rates due to the increased energy required by the larger body. Eating normal amounts of soy does not cause hormonal imbalance.
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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".