Where is the natural geographic range of Family Cyprinidae members like *Danio rerio* concentrated?
Answer
Drainages of the Ganges, Brahmaputra, and Mekong rivers.
The native distribution of the zebrafish (*Danio rerio*) is specifically localized to South Asia. This area encompasses the drainages of major river systems including the Ganges, Brahmaputra, and Mekong rivers, spanning countries such as India, Pakistan, Nepal, and Bangladesh. While the species is now found globally due to research and the pet trade, its classification within the Cyprinidae family frames its evolutionary history within the context of Asian freshwater ichthyology. Its presence in the United States is officially recorded as non-native or introduced, not as part of its original geographic range.
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