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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.
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.
The amount of water needed varies by person, weight, diet, activity level, clothing, and the ambient heat and humidity. Water does not actually need to be drunk in pure form, and can be derived from liquids such as juices, tea, milk, soups, etc., and from foods including fruits and vegetables.
Several television game shows such as Fear Factor, Survivor and I'm a Celebrity feature segments where contestants must eat live animals including spiders, cockroaches and grubs. On his show Man vs. Wild, host Bear Grylls is sometimes shown eating various insects alive. There have been calls to ban eating animals alive on these shows. [1]
The yacare caiman (Caiman yacare), also known commonly as the jacare caiman, Paraguayan caiman, piranha caiman, red caiman, [5] and southern spectacled caiman, [6] is a species of caiman, a crocodilian in the family Alligatoridae.
Attacks by piranhas resulting in deaths have occurred in the Amazon basin. In 2011, a drunk 18-year-old boy was attacked and killed in Rosario del Yata, Bolivia. [75] In 2012, a five-year-old Brazilian girl was attacked and killed by a shoal of P. nattereri. [76] Some Brazilian rivers have warning signs about lethal piranhas. [77]
Piranhas are "basically like regular fish with large teeth". [125] Humboldt squid are large carnivorous marine invertebrates that move in schools of up to 1,200 individuals. They swim at speeds of up to 24 kilometres per hour (15 mph or 13 kn) propelled by water ejected through a siphon and by two triangular fins.
Tilapia farmers sometimes keep peacock bass to eat any spawn that occur among their fish, in addition to eating any invasive fish that pose a threat to young tilapia (e.g. sunfish, piranha). Spawning and brood-raising reduce the growth rate of the tilapia, so introduction of Cichla is thought to maintain a high growth rate in the tilapia.