26 Tropical fish

Tropical fish are generally those fish found in aquatic tropical environments around the world, including both freshwater and saltwater species. Fishkeepers often keep tropical fish in freshwater and saltwater aquariums. The term "tropical fish" is not a taxonomic group, but rather is a general term for fish found in such environments, particularly those kept in aquariums.

Coral reef fish are fish which live amongst or in close relation to coral reefs. Coral reefs form complex ecosystems with tremendous biodiversity. Among the myriad inhabitants, the fish stand out as colourful and interesting to watch. Hundreds of species can exist in a small area of a healthy reef, many of them hidden or well camouflaged. Reef fish have developed many ingenious specialisations adapted to survival on the reefs.

Agoniates is genus of characiform fishes from tropical South America.

Aplocheilus parvus, the dwarf panchax, is a species of killifish native to India and Sri Lanka. This species grows to a length of 6.3 cm (2.5 in). Its natural habitats are sheltered fresh and brackish water tanks, small streams and rivulets overgrown with vegetation. They are rarely use as an aquarium fish. It is often misidentified as Aplocheilus panchax or as Aplocheilus blockii.

The scarlet badis is a tropical freshwater fish and one of the smallest known percoid fish species. It is a micropredator, feeding on small aquatic crustaceans, worms, insect larvae and other zooplankton. It is sold under a variety of names in the aquarium trade.

The Buenos Aires tetra is a tropical fish from South America. It was first observed in the wild in 1907, by Carl H. Eigenmann.

Cirripectes matatakaro, the Suspiria blenny, is a species of combtooth blenny that occurs on coral reefs in the central/southern tropical Pacific. In the northern hemisphere, it is known from the Northern Line Islands and in the southern hemisphere it occurs at the Marquesas, Tuamotu, Pitcairn, Gambier, and Austral islands. This species reaches a length of 6.5 centimetres (2.6 in) SL.

Corydoras punctatus is a species of catfish found in the Suriname river basin and Iracoubo river basin in tropical Suriname and French Guiana. The species is rarely seen. It is hard to tell the sex of the fish until they are an adult. The species can breed easily. The species eat many foods including shrimp pellets, blood worms, brine shrimp, and pre-soaked flake food. Corydoras punctatus is a social fish.

Ctenobrycon spilurus, the silver tetra, is a species of tropical freshwater fish sometime referred to as the silver dollar tetra. It is a member of the family Characidae in the order Characiformes. The fish is native to Orinoco River basin and coastal river basins of Guyana, Suriname and French Guiana, and can be found in shallow slow moving streams with heavy vegetation. With temperatures that range from 23–27 °C (73–81 °F). The fish can grow to a maximum length of 8.0 cm.

Girardinus falcatus, the goldbelly topminnow, is a species of Cuban tropical fish. Another common name of the species is yellow belly. The fish is pale gold and has a bright blue iris. Males are smaller than females and constantly mate.

Girardinus metallicus is a species of fish from the family of the Poeciliidae.

Halichoeres maculipinna, the clown wrasse, is a species of tropical fish that lives throughout the Caribbean Sea and adjacent parts of the western Atlantic Ocean. It is a carnivorous, multi-colored wrasse that is common throughout its range.

Hyphessobrycon sweglesi is a species of tetra that lives in the Orinoco River drainage basin in South America. The fish has a round black spot behind the gill-plate, a black band on the dorsal fin that is bordered above and below by creamy-white. The other fins are red same as the upper rim of the eye. The fish eats worms, small insects, and crustaceans. The species can lay up to 400 eggs that can hatch in a day and that are susceptible to fungus. The species' appearance is very similar to Hyphessobrycon megalopterus. The species' scientific name used to be Megalamphodus sweglisi and the species' common name is red phantom tetra.

Kryptolebias is a genus of killifish in the family Rivulidae mostly native to warm parts of South America but with one species found north through the Caribbean region to the Gulf Coast states of the United States. They are small fish, up to 7.5 cm (3.0 in) in total length. They are non-annual killifish. The genus was originally name Cryptolebias but this name was pre-occupied by a genus of fossil fish.

The lemon tetra is a species of tropical freshwater fish which originates from South America, belonging to the family Characidae. It is a small tetra growing to 5 cm in length. The species is a long established favourite aquarium fish, being introduced to the aquarium in 1932.

The minor tetra is a small fish from the Essequibo River in Guyana in South America, closely resembling its relative, the serpae tetra, from the Amazon and Paraguay. These two very similar species are separated geographically, so they would not interbreed.

Nemateleotris helfrichi, Helfrich's Dartfish, is a species of dartfish native to the Pacific Ocean.

Oreichthys is a genus of tropical barbs found in Thailand, India, Bangladesh, Myanmar (Burma), northern Malay Peninsula, and the Mekong basin in Laos. They are found in ditches, ponds, streams and canals. The genus Oreichthys was originally established to receive little fish collected in a small brook on Kao Sabap, an extensive mountain range near Chantaban, Thailand.

Oreichthys cosuatis is a small cyprinid fish found in India and Bangladesh.In India it is found along the ganga and brahmaputra river drainage in the states of West bengal and odisha It is also reported from Thailand and Myanmar.

Oreichthys crenuchoides is a small cyprinid found in Assam, India. It is imported for the aquarium trade under the name neon highfin barb or high-fin variable barb. It is an atypical Oreichthys in that the face is more rounded than in O. cosuatis and other Oreichthys species.

Parablennius intermedius, the false Tasmanian blenny or horned blenny, is a species of combtooth blenny found in the Indian ocean near Australian coasts. This species reaches a length of 12 centimetres (4.7 in) TL.

Parakneria cameronensis is a benthopelagic species of tropical fish. The species can grow up to 8.3 cm, and are commonly found in the Congo River. The fish has a projectile upper jaw and subterminal mouth. The species' common name is Cameroon shellear.

Pyrrhulina is a genus of freshwater fishes found in tropical South America. Several of these species are popular aquarium fish.

The rosy tetra is a small species of Characin from the South American countries of Guyana and Brazil.It is popular in the aquarium trade.

The rummy-nose tetra is a species of tropical freshwater characin fish originating in South America, popular among fishkeepers as an aquarium fish. One of many small tetras belonging to the same genus, it is on average 5 cm (2 in) long when fully grown, and is a long established favourite among tropical fishkeepers. The fish is one of several very similar species including Hemigrammus bleheri, and Petitella georgiae, and it is possible that more recently collected specimens available in the aquarium trade are members of one or other of these similar species. The common name applied to most of these fishes is "rummy-nose tetra", though other common names are in circulation.

Tomiyamichthys russus, also known as the Ocellated shrimpgoby, is a species of goby native to the South China Sea where it can be found on silty bottoms at depths of from 1 to 5 metres, often near the mouths of streams.