Columbia subject headings:
Freshwater fishes--Research--Colorado River (Colo.-Mexico)
Rare fishes--Effect of turbidity on--Colorado River (Colo.-Mexico)
Rare fishes--Effect of water levels on--Colorado River (Colo.-Mexico)
Harvard subject headings:
Freshwater fishes--Research--Colorado River (Colo.-Mexico)
Rare fishes--Effect of turbidity on--Colorado River (Colo.-Mexico)
Rare fishes--Effect of water levels on--Colorado River (Colo.-Mexico)
Princeton subject headings:
Food chains (Ecology)--Colorado River (Colo.-Mexico).