Small schooling fish found in Amazon River's coastal waters. First described by Albert Ulrey in 1894. Only known species in its genus, related to nearly 150 other tetras
Astronotus ocellatus reaches 45 cm length and 1.6 kg weight. Dark colored with yellow-ringed spots on caudal peduncle and dorsal fin. Can rapidly change coloration for territorial and combat behaviors. Juveniles have striped white and orange bands with spotted heads
Geophagus is a genus of South American freshwater cichlids. Mainly found in South America, with one species from Panama. Largest species reach up to 28 cm in standard length. Part of eartheater group feeding by sifting sediment. Most commonly kept in aquariums
Otocinclus is a genus of South American catfish known as "dwarf suckers". Species range from 2.4 cm (O. tapirape) to 5.5 cm (O. flexilis). Characterized by armor plating and underslung suckermouth. Name derived from Greek "oto" (ear) and Latin "cinclus" (latticework)
Fish are diverse species found in oceans, rivers, lakes and aquariums. Main categories include freshwater, saltwater, cartilaginous and bony fish. Ocean fish include tuna, mackerel, swordfish and whale shark
Fish are gill-bearing aquatic animals with limbs and digits. Most fishes are cold-blooded and breathe through gills. Fish have closed-loop circulatory system and reproduce in open water. They are omnivorous and feed on plants and small sea animals