Columbia subject headings:
Harvard subject headings:
Fish, populations--Brazil--Amazonas--Rio Negro.
Fishes--Brazil--Amazonas--Rio Negro.
Food chains (Ecology)--Brazil--Amazonas--Rio Negro.
Freshwater fishes--Brazil--Amazonas--Rio Negro.
Princeton subject headings:
Fish populations--Brazil--Rio Negro (Amazonas).
Food chains (Ecology)--Brazil--Rio Negro (Amazonas).
Freshwater fishes--Brazil--Rio Negro (Amazonas).