39 Fish described in 1849

Acentrogobius cyanomos, or the Threadfin blue goby is an amphidromous benthopelagic species of goby found in brackish and salt water in Bangladesh, India, Indonesia, Malaysia, and Thailand. Individuals grow up to 11.5 centimetres (4.5 in) long.

The Arulius barb is a tropical cyprinid fish native to the Kaveri River basin of south east India. Other common names include Tamiraparani barb, Silas barb and longfin barb.

Jerdon's baril is a fish in the genus Barilius of the family Cyprinidae. It is found in southern Karnataka and northern Kerala.

Blenniella cyanostigma, the striped rockskipper, is a species of combtooth blenny found in coral reefs in the Indian Ocean.

The bumblebee fish is a species of fresh and brackish water goby native to Thailand and Indonesia. This species can reach a length of 3.8 centimetres (1.5 in) SL and is found in lower parts of rivers, coastal areas, mangroves and highly vegetated areas.

Butis koilomatodon, commonly known as the mudsleeper, is a species of fish in the family Butidae native to fresh, brackish and salt water of the Indo-Pacific region, ranging from Madagascar and Mozambique to the Philippines, China and Australia. It has been introduced to the Atlantic region where considered invasive and known from Panama, Venezuela and Brazil as well as Nigeria. This predatory species mainly lives in rivers, estuaries and mangroves, and reaches up to 10.7 cm (4.2 in) in total length.

The camouflage grouper, also known as the blue-tailed cod, camouflage rockcod, small-toothed rockcod, smooth flowery rock-cod, snout-spot grouper or snout-spot rock-cod, is a species of marine ray-finned fish, a grouper from the subfamily Epinephelinae which is part of the family Serranidae, which also includes the anthias and sea basses. It has a wide Indo-Pacific distribution where it is associated with reefs.

The club-foot whiting, Sillaginopodys chondropus,, the only member of the genus Sillaginopodys, is a coastal marine fish of the smelt whiting family Sillaginidae that inhabits a wide range including west Africa, India and the northern Indonesian Archipelago. The species is unique in the morphology of the pelvic spine and fin, making identification of the species easier than most of its relatives. The species is of minor commercial importance, taken by seine net and marketed fresh throughout its range.

Colomesus asellus, the Amazon puffer, asellus puffer, South American freshwater puffer or Peruvian puffer is a species of pufferfish confined to the Amazon, Essequibo and Orinoco basins in tropical South America. It is a popular aquarium species.

Dawkinsia assimilis is a species of ray-finned fish in the genus Dawkinsia. It is endemic to the southern Western Ghats. They are known as Mascara Barb.

Dawkinsia rubrotinctus is a species of barb native to the Kaveri river basin in southern India.

Erethistes pusillus is a species of South Asian river catfish native to India, Bangladesh and Myanmar where it is mostly found in hill streams. This species prefers muddy portions of rivers that are overgrown with vegetation. This species grows to a length of 4.2 centimetres (1.7 in) SL. It is kept in tropical aquaria, but its occurrence in the aquarium trade is very rare.

Euthynnus affinis, the kawakawa or mackerel tuna, is a species of ray-finned bony fish in the family Scombridae, or mackerel family. It belongs to the tribe Thunnini, better known as the tunas. This is an Indo-Pacific species which is found from the Red Sea to French Polynesia.

Goeldiella eques is a species of three-barbeled catfish that occurs in the Guianas and the Amazon basin of Brazil, Peru and Venezuela. This fish reaches a length of 28.9 centimetres (11.4 in) SL. It is the only species of its genus.

The goldstripe sardinella is a species of fish of the family Clupeidae. It is native to shallow tropical waters of the western Indo-Pacific, living at depths down to 70 m, and being associated with coral reefs. It grows up to 17 cm in length and forms large schools.

Hippichthys heptagonus, the belly pipefish, is a species of freshwater pipefish of the family Syngnathidae. It is found from Kenya and South Africa to the Solomon Islands, and from southern Japan to New South Wales. It is a demersal species, living in the lower parts of rivers and streams, estuary habitats such as mangroves and tidal creeks, and occasionally in large lakes. It feeds on small crustaceans, such as copepods and cladocerans, as well as dipteran and ephemopteran larvae. It can grow to lengths of 15 centimetres (5.9 in). This species is ovoviviparous, with females depositing eggs on the males, who in turn give birth to live young several weeks later. Males may brood at 6.5–7.5 centimetres (2.6–3.0 in).

The beady pipefish is a species of pipefish of the family Syngnathidae. It is found in the Indo-West Pacific, from the western Persian Gulf, to the north central Indian Ocean, to Japan and Australia. It lives in the lower parts of streams and rivers, estuarine habitats such as seagrass beds and mangroves, and shallow inshore habitats, where it can grow to lengths of 16–18 centimetres (6.3–7.1 in). It is expected to feed on small crustaceans, similar to other pipefish. This species is ovoviviparous, with males carrying eggs in a brood pouch before giving birth to live young. Average brood size is 177.

Hypselobarbus carnaticus, also known as the Carnatic carp, is a species of cyprinid fish from the Western Ghats in India where it inhabits riffles and larger pools in rapidly flowing rivers and streams. It prefers to shelter underneath boulders and overhangs. This species can reach a length of 60 centimetres (24 in) TL and has attained a maximum reported weight of 12 kilograms (26 lb). It is a commercially important fish and is also farmed.

Leiarius pictus, commonly as Sailfin Pim, Painted Catfish or Saddle Catfish, is a species of demersal catfish of the family Pimelodidae that is native to Amazon, Essequibo, and Orinoco River basins of Colombia Venezuela, Peru and Brazil.

The longfin mojarra is a species of mojarra native to the coastal waters of the Indian Ocean from India to the western Pacific. This species grows to 15 cm (5.9 in) in total length, though most do not exceed 10 cm (3.9 in). This species is of minor importance to local commercial fisheries, usually being made into fish meal or feed for ducks. It is the only known member of the genus Pentaprion.

Lutjanus russellii, commonly known as Russell's snapper, is a marine fish native to the western Pacific Ocean. They live in brackish water in rocky areas and coral reefs at depths of 20–50 m.

The Malabar danio is a tropical fish belonging to the minnow family (Cyprinidae). Originating in Sri Lanka and the west coast of India, the fish has been circulated throughout the world through the aquarium fish trade. It grows to a maximum length of 6 in (15 cm) rarely exceeds 4 in (10 cm) in a home aquarium.

The melon barb is a common species of cyprinid fish that is endemic to rivers in Goa, Karnataka, Kerala and Tamil Nadu in the Western Ghats of South India. They live in a tropical climate in water that typically has a pH of 6.0—6.5, a water hardness of around 5 dGH, and a temperature range of 22–26 °C (72–79 °F). This species can also be found in the aquarium trade.

Oxyurichthys microlepis, the maned goby, is a species of goby native to tropical marine and brackish waters along the coasts of the Indian Ocean from Africa to the western Pacific Ocean where it occurs in estuaries and inshore waters to depths of about 75 metres (246 ft). It occurs in the Mekong Delta and is suspected to use the tidal flow up the river to reach as far inland as Cambodia. This species can reach a length of 13.5 centimetres (5.3 in) TL. It is of minor importance to local commercial fisheries and can also be found in the aquarium trade.

Petroscirtes variabilis, the variable sabretooth blenny, variable fangblenny, or the variable blenny, is a species of combtooth blenny found in the western Pacific and Indian ocean. This species reaches a length of 15 centimetres (5.9 in) TL.

The pigmouth carp is a cyprinid, benthopelagic, tropical fish found in India.

Stigmatogobius pleurostigma is a species of goby from the subfamily Gobionellinae that lives freshwater to brackish water in Southeast Asia.

Polycentrus schomburgkii, also known as the Guyana leaffish is a species of fish belonging to the family Polycentridae. It inhabits fresh and brackish waters, both clear and turbid, of the northeastern part of South America and Trinidad. It reaches a maximum length of 5.5 centimetres (2.2 in).

Proteracanthus sarissophorus is a species of ephippid native to coral reefs around Malaysia, Borneo, and Sumatra. This species grows to a length of 32.5 centimetres (12.8 in) SL. This species is the only known member of its genus.

Pseudochromis fuscus is a species of saltwater fish in the dottyback family. Dottybacks are generally very bright in color and relatively small, factors which have made them popular among aquarium enthusiasts. Besides their coloration and size, they are probably best known for their aggressive temperament. While many of the more common dottybacks are in the Pseudochromis genus, there are also species in other genera. Common names for this particular species include the brown dottyback, the golden dottyback, and the musky dottyback. The common name “Golden dottyback” is shared with another species of dottyback, the Pseudochromis pseudoplesiopinae. The species name, fuscus, means dark or dusky in Latin.

Pseudotriacanthus strigilifer, the long-spined tripodfish, is a species of Triacanthidae native to the Indian Ocean and the central western Pacific Ocean where it is found in coastal marine waters, also entering brackish waters in estuaries, at depths of from 2 to 110 metres. This species grows to a length of 25 centimetres (9.8 in) TL though it more usually does not exceed 20 centimetres (7.9 in) TL. It is of minor commercial importance and is also found in the aquarium trade. This species is the only known member of its genus.

The long-snouted barb is a species of ray-finned fish in the genus Puntius. It is found in India and Sri Lanka.

The silver rasbora is a species of ray-finned fish in the genus Rasbora. It occurs in the Mekong, Chao Phraya and Mae Klong basins, Malay Peninsula as well as Borneo, Java and Sumatra.

The slender rainbow sardine is a small, subtropical, salt water fish of the Indian Ocean and the South China Sea which was first described by Bleeker in 1849. Dussumieria hasselti and Dussumieria productissima are synonyms for this same fish. It is a round herring of the family Clupeidae.

Taeniamia fucata, commonly known as the orange-lined- or painted cardinalfish, is a marine fish native to reefs from northern Australia and New Guinea, across the Indian Ocean to the east coast of Africa, and Pacific Ocean to Marshall Islands, Samoa, Tonga, and the Ryukyu Islands. It was known as Archamia fucata until 2013. FishBase treats T. sansibaricus as synonymous with T. fucata. but T. sansibaricus is recognised as valid by the Catalog of Fishes:

The tasseled scorpionfish, or small-scaled scorpionfish, Scorpaenopsis oxycephala, is a carnivorous ray-finned fish with venomous spines that lives in the Indian and Pacific Oceans. It can reach a maximum length of 36 cm (14 in) and can vary considerably in color. Adults are bearded with a number of tassels below the jaw.

The threadfin acara, also known as Heckel's thread-finned acara, is a South American species of cichlid fish. It is the only member of the genus Acarichthys and is native to rivers in the Amazon and Essequibo basins in tropical South America, and has become established in southeastern Asia. It is sometimes found in the aquarium trade.

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.