They includes the discus fish (Symphsodon aequifasciata sp.), hundreds of cichlids such as in the genus Cichlasoma, assorted characins (family Anostomidae), tetras such as those in the genera Hemigrammus and Hyphessobrycon, and many catfish (families Aspredinidae, Corydoradinae, Doradidae, and Loricariidae).    From Wordnik.com.  [Purus varzea] Reference

Many beautiful ornamental fish are taken from the blackwater tributaries and lakes in this region for aquaria: the discus Symphysodon discus and S. aequifasciata, hundreds of cichlids in the genus Cichlasoma, assorted characins, Anostomidae, tetras in the genera Hemigrammus and Aequifasciata, and Hyphessobrycon spp., and many catfish of the families Aspredinidae, Corydoradinae, Doradidae and Loricariidae.    From Wordnik.com.  [Central Amazonian Conservation Complex, Brazil] Reference

Many beautiful aquarium fish come from these rivers and blackwater tributaries and lakes in this region, including the discus fish (Symphsodon aequifasciata sp.), hundreds of cichlids, such as in the genus Cichlasoma, assorted characins (family Anostomidae), tetras such as those in the genera Hemigrammus and Hyphessobrycon, and many catfish (families Aspredinidae, Corydoradinae, Doradidae, and Loricariidae).    From Wordnik.com.  [Gurupa varzea] Reference

These include the angelfish (Pterophyllum scalare), the discus fish (Symphsodon aequifasciata sp.), hundreds of cichlids such as in the genus Cichlasoma, assorted characins (family Anostomidae) such as tetras in the genera Hemigrammus and Hyphessobrycon and the famous neon tetra (Paracheirodon innesi), and many small catfish (families Aspredinidae, Corydoradinae, Doradidae, and Loricariidae).    From Wordnik.com.  [Iquitos varzea] Reference