The natterera piranha comes from the Amazon, Orinoco, La Plata and Guiana rivers. Under natural conditions, this fish reaches a length of up to 30 centimeters, but in an aquarium its dimensions are an order of magnitude more modest and rarely exceed 20 centimeters.
A hydrobiont has an elongated body laterally compressed and a powerful tail fin. The dorsal and anal fins are quite large and around the edges they are slightly rounded. Piranha is famous for its powerful big powerful teeth.
The lower jaw of the fish is slightly advanced in relation to the upper one. On the head are two large eyes with black pupils.
The color of the back can be as silvery gray to dark shades, the sides have a bronze sheen with a scattering of black dots. The lower part of the body of the fish from the anal fin to the gill covers is bright red.
The tail, adipose and dorsal fins are black, the anal is red, and the pectoral fins are transparent.
Females are slightly larger than males and they have a fuller abdomen. Males differ from females in the shape of the anal fin: in males, it is a pointed shape, and females – rounded.
The content of piranhas does not present any difficulties, but due to the excessive aggressiveness of aquatic organisms, they cannot be kept with other aquarium fish. They don’t really get along well with each other: quite often, in particular during stress, the fish can inflict quite serious physical damage to each other.
Accordingly, in order to minimize such skirmishes, it is better to fish the fish in bulk tanks with a large number of broadleaf plants and snags, where the fish will arrange shelter for themselves.
Piranhas need clean and fresh aquarium water, the hardness of which should be from 10 to 12 degrees, an active response of 6.2 – 6.4 pH and a temperature of 24 – 26 degrees. Fish do not like sudden changes in chemical parameters of water during changes.
In addition, a powerful external filter should be installed in the piranha aquarium.
Feeding piranhas has a number of features. First you need to deal with the range.
In the menu for predatory fish it is necessary to include a large bloodworm, earthworms and small mice, so that each fish has one mouse.
During feeding, you need to monitor the meal and the behavior of fish. If piranha food is not torn to pieces and do not fight with each other for it, then something is wrong with the conditions of detention.
The reason may be low water temperature, poor aeration or insufficient water changes. In any case, it will be up to the aquarist to deal with all the reasons.
In addition to the above feeds, piranhas love squid meat and beef heart. With a varied and abundant feeding increases the likelihood of obesity in fish, especially the content in large aquariums.
You can avoid this, but on the condition that you will arrange for your pets a fasting day once a week, and a powerful current will be organized in the aquarium.
The stimulation of spawning is a large substitution of water for fresh and softer, increased aeration and abundant feeding of producers with high-calorie feed. Most experienced aquarists resort to hormone injections to stimulate reproduction.
Spawning takes place under the following circumstances: the male digs a hole in the ground with a diameter of up to 20 centimeters, where the female will lay batch of eggs, which the male fertilizes immediately. The spawning process itself is rather boring and without any courtship courtship, unlike most aquarium fish.
In the process of spawning, the male and female change their color from silver to charcoal black with numerous sparkles.
Eggs are colored in yellowish-pink tones and their diameter does not exceed a couple of millimeters. The male is guarding the nest, and at this time the fish should be disturbed as little as possible.
In view of the aggressive nature of caring parent may show inadequate response. After several days, the larvae will already be swarming in the nest.
By this time, the male must be removed from the spawner, and it is better to transfer the larvae to a special aquarium with water of a similar chemical composition using a glass tube.
The young growth develops in the same way as in the majority of representatives of the haracin. Piranha fry grow very quickly and need to be sorted and transferred to the appropriate types of feed.
The color of the fry is brighter, unlike adult fish. Fish reach sexual maturity at the age of two years.