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Black Tetra
The black tetra (Gymnocorymbus ternetzi) is a freshwater fish of the characin family (family Characidae) of order Characiformes. It is native to the Paraguay and Guaporι River basins of southern Brazil, Argentina, and Bolivia. Growing to about 6 cm (2.5 in) total length, the black tetra has a roughly tetragonal body shape and is greyish in colour, fading from light at the nose to near black at the tail. Two prominent black vertical bars appear just posterior of the gills. ... read more
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