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(Mmm, right click, add, set as background...) Archive 22

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Compare these choppers with those of the crushing, plant chewing Pacus. Now you know why they're called "Toothy Tetras".  Piranha mount at the Baltimore Aquarium.

Pygocentrus piraya (Cuvier 1816), the San Francisco Piranha. South America; endemic to the Sao Francisco Basin of Brazil. To nearly thirteen inches in length (largest true Piranha). Aquarium photo. 
Hyphessobrycon herbertaxelrodi Gery 1961, the  Black Neon Tetra. South America: Paraguay River basin. To 3.2 cm. in length. Cond.s: pH 5.5-7.5, dH to 15, temp. 23-27 C. Aquarium image.
Gymnocorymbus ternetzi (Boulenger 1895), the Blackskirt Tetra. To 6 cm. South America; Paraguay and Guapore Basins. pH 6-8, dH 5-19, temp. 20-26 C. A few "sports" of this species have been produced for the aquarium interest. Ones with no barring, some with no color whatsoever, longfinned varieties...

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