Hypostomus plecostomus (known colloquially as a sucker fish) is the scientific name for a type of freshwater tropical Central and South American fish belonging to the family Loricariidae. They are large algae eaters, and to differentiate them from small algae eaters, they are often referred to as plecostomus, often abbreviated as plecos or plecs.

Pterophyllum is a small genus of freshwater fish from the family Cichlidae known to most aquarists as "Angelfish". All Pterophyllum species originate from the Amazon River, Orinoco River and Essequibo River basins in tropical South America. The three species of Pterophyllum are unusually shaped for cichlids being greatly laterally compressed, with round bodies and elongated triangular dorsal and anal fins.

The Glass Catfish (Kryptopterus bicirrhis) is an Asian glass catfish of the genus Kryptopterus. Until 1989, it included its smaller relative the Ghost Catfish, now known as K. minor. Its scientific name and common name are often still used in the aquarium fish trade to refer to the Ghost Catfish; as it seems, the larger and more aggressive K. bicirrhis was only ever exported in insignificant numbers, if at all.

The Banggai cardinalfish (Pterapogon kauderni) is a small tropical cardinalfish (family Apogonidae). This attractive fish is popular in the aquarium trade. It is among the relatively few marine fish to have been bred regularly in captivity, but significant numbers are still captured in the wild and it is now a threatened species.

Canthigaster solandri is a ray-finned species of fish and member of the pufferfish family. It grows to a length of 11.5 centimers (4.5 in). It lives in the tropical Indo-Pacific: from East Africa to the Line Islands and Tuamotu, north to the Ryukyu Islands, south to New Caledonia and Tonga, to the Hawaiian Islands. They have the ability to rapidly fill themselves up like a water balloon, to protect themselves from predators. Their skin also contains a poison

The fiddler rays or banjo sharks are a genus, Trygonorrhina, of guitarfish, family Rhinobatidae. There are two species, found along the eastern and southern coasts of Australia. They are benthic in nature, favoring shallow sandy bays, rocky reefs, and seagrass beds. The eastern fiddler is found to a depth of 120 m and the southern fiddler to a depth of 180 m.