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Which river supplied many of the Brazilian fish studied by Louis Agassiz?

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The Brazilian fish studied by Louis Agassiz were primarily supplied by the Amazon River.1

While Agassiz later conducted his own expedition to Brazil in 1865, his foundational interest in ichthyology was sparked by an extensive collection of fishes from the Amazon that had been gathered by other naturalists in 1819 and 1820. He subsequently classified these specimens and published his findings in the 1829 work Selecta Genera et Species Piscium.1