Diamond Black Piranha Xingu River 3"-4"
(FwF Piranha Serra Rhom xingu1)
Serrasalmus rhombeus (Linnaeus 1766)
Rhombeus Piranha, Black Piranha, White Piranha, Peruvian Black Piranha, Brazilian Black Piranha, Spotted Piranha, S. Niger Piranha. The Natives call this fish Piranha Preta, meaning Black Piranha, and Piranha Blanco meaning White Piranha.
Very widespread, found in the Amazon Basin, Orinoco Basin, Guyanas, Venezuela, Peru.
At least 45cm. (18"), according to South American locals even as much as 55cm. (22"), and possibly even larger. These claims however still have to be substanciated.
Compared to most other piranha species, there is relatively high number of larger specimen in home and public aquaria (12" and above), although true giants (18"+) are very rare. This species has a notoriously slow growth rate.
- No clear terminal band (hyaline edge) on tail fin.
Juveniles and sub-adults can be kept in a tank measuring 32x14". Adult fish need a tank of at least 60x20x20" (and even more for very large specimen, 12" and more - fish that big are quite rare in captivity however).
Young Rhombeus Piranha's can be very shy. Therefore, they need a well planted tank with bog wood or rocks to provide shelter. When larger, this species becomes very agressive, and places to hide are no longer really necessary.
This species will accept all common food items, like fish (fillets, frozen fish and live feeders), shrimp and other crustaceans, insects and, when large enough, mammals, reptiles and amphibians.
In the wild, this species is a parasitic fin nipper when young, full blown predatory carnivore when older. Will, almost without exception, not tolerate anything else living in its tank. Even much larger fish will be attacked, nipped and injured over and over, until they finally perish.
This large, and very powerful species of piranha is not considered dangerous to man in the wild state, but it can deliver extremely painful wounds. It is said that a mature S. Rhombeus is capable of severing a man's hand at the wrist in two or three bites, and given the potential size of this large and very powerful species, it's hard to believe this is a gross exaggeration.
When we are talking about the Rhombeus Piranha, we are actually referring to a complex of several different forms and closely knit species of fish, all with slightly different habits and appearences. Some varieties are the Xingù, Highback and Jet Black Rhombeus. Due to their highly intolerant behavior, these fish should be kept solitary, and are best suited to large display aquariums. In the wild, this species is observed to travel and co-exist in small, loose groups, but in general they prefer a solitary life in the wild.
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