Kryptopterus geminus is a species of catfish belonging to the family Siluridae. It can be distinguished from all its congeners, with the exception of Kryptopterus cryptopterus, by the almost flat dorsal profile with no concavity behind the head. This species grows to a length of 17.1 centimetres (6.7 in) SL.
The wildlife of Laos encompasses the animals and plants found in the Lao People's Democratic Republic, a landlocked country in southeastern Asia. Part of the country is mountainous and much of it is still clad in tropical broadleaf forest. It has a great variety of animal and plant species.
The Asoka barb is a species of cyprinid fish endemic to Sri Lanka where it is found in the upper reaches of the Sitawaka River and its tributaries, and Kelani near Kitulgala. This fish can reach a length of 17 centimetres (6.7 in) TL.
Martenstyn's Barb is a species of cyprinid fish endemic to Sri Lanka. This species can reach a length of 25 centimetres (9.8 in). It is important to local commercial fisheries.
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.
Systomus compressiformis is a species of cyprinid fish endemic to Inle Lake, Myanmar. It is threatened by anthropogenic changes to the lake including the introduction of non-native species of plants and fishes.
The olive barb is a species of cyprinid fish native to Afghanistan, India, Nepal, Bangladesh, Pakistan, Bhutan and Sri Lanka with reports also from Thailand and Myanmar. This species can reach a length of 42 centimetres (17 in) TL. It is of minor importance to local commercial fisheries as well as being sought after as a gamefish. However, it is highly sought after in Bangladesh. It can also be found in the aquarium trade though it is not very popular.
Poropuntius angustus is a species of cyprinid fish. It is endemic to the Mekong Basin and is currently only known from a few tributaries of Mekong in Laos. It grows to 12 cm (4.7 in) SL. It lives mainly in small forest streams.
Schistura novemradiata is a species of ray-finned fish, a stone loach, in the genus Schistura which has been recorded from a single locality in the upper Nam Tha watershed in Laos where it was found in a small stream over a substrate consisting of gravel and stone.
Hemimyzon confluens is a species of ray-finned fish in the genus Hemimyzon. It is known from a single location in the Nam Ngum drainage in Laos, a tributary of the Mekong. The known material suggests a maximum standard length of about 47 mm (1.9 in). H. confluens is threatened by pollution from mining activities and hydro-power development.
Hemimyzon khonensis is a species of hillstream loach in the genus Hemimyzon. It is known from a single specimen collected in the Mekong at the Khone Falls in Laos, near the Cambodian border; it is named for the falls. The specimen was 51 mm (2.0 in) in standard length.
The Stedman barb is a species of cyprinid fish native to India and Bangladesh in the Ganges River basin where it occurs in foothill streams and rivers. This species can reach a length of 24 centimetres (9.4 in) TL. It is of minor importance to local commercial fisheries.
Homaloptera confuzona is a species of hillstream loach in the genus Homaloptera found in Laos, Cambodia and Thailand. It lives in the lower Mekong drainage and coastal streams of Cambodia and eastern Thailand. The maximum size is about 40 cm (16 in) SL.
Badis ruber is a species of freshwater ray-finned fish from the family Badidae. It is found in Mekong, Salween and Irrawaddy basins in China, Laos and Thailand.
Auriglobus modestus, the bronze puffer or golden puffer, is a ray-finned fish in the family Tetraodontidae. It is found in the middle parts of rivers to their estuaries in southeast Asia, including Cambodia, Laos, Thailand, Vietnam, Malaysia and Indonesia. It grows to a maximum length of 10.6 cm (4.2 in) and feeds on small invertebrates, seeds, fish scales and small fish.
Devario apopyris is a freshwater fish endemic to Laos.
Devario fangfangae is a freshwater fish endemic to the Nam Kading drainage in Laos.
Devario leptos is a freshwater fish found in the Nam Tha and Nam Beng watersheds in Laos.
Devario salmonata is a freshwater fish endemic to the Xe Kong drainage in Laos.
Papuligobius uniporus is a species of small goby in the subfamily Gobionellinae. It is also the type species of the genus Papuligobius.
