The Congo River, formerly also known as the Zaire River, is the second longest river in Africa, shorter only than the Nile, as well as the second largest river in the world by discharge volume, following only the Amazon. It is also the world's deepest recorded river, with measured depths around 219.5 m (720 ft). The Congo-Lualaba-Chambeshi River system has an overall length of 4,700 km (2,920 mi), which makes it the world's ninth-longest river. The Chambeshi is a tributary of the Lualaba River, and Lualaba is the name of the Congo River upstream of Boyoma Falls, extending for 1,800 km (1,120 mi).
The Chao Phraya is the major river in Thailand, with its low alluvial plain forming the centre of the country. It flows through Bangkok and then into the Gulf of Thailand.
The Chinese paddlefish, also known as the Chinese swordfish, is an extinct species of fish that was formerly native to the Yangtze and Yellow River basins in China. With records of specimens over 3 metres and possibly 7 metres in length, it was one of the largest species of freshwater fish. It was the only species in the genus Psephurus and one of two recent species of paddlefish (Polyodontidae), the other being the American paddlefish. It was an anadromous species, meaning that it spent part of its adult life at sea, while migrating upriver to spawn.
The common dace is a species of freshwater and brackish water ray-finned fish from the family Cyprinidae which is native to Europe but which has been introduced to other parts of the world. It is a quarry species for coarse anglers.
The Sluch or Southern Sluch is a river, a right tributary of the Horyn, which flows through Ukraine. It has a length of 451 km and a drainage basin of 13,800 km². The Sluch river takes its source in the Ukrainian province of Khmelnytskyi, and then flows through the Zhytomyr and Rivne oblasts, and flows briefly along the Ukrainian-Belarusian border before finally emptying into the Horyn.
Alburnoides is a genus of cyprinid fishes native to Europe and Asia. Many species are known as riffle minnows or spirlins.
Dabry's sturgeon, also known as the Yangtze sturgeon, Chiangjiang sturgeon and river sturgeon, is a species of fish in the sturgeon family, Acipenseridae. It is endemic to China and today restricted to the Yangtze River basin, but was also recorded from the Yellow River basin in the past. It was a food fish of commercial importance. Its populations declined drastically, and since 1988, it was designated an endangered species on the Chinese Red List in Category I and commercial harvest was banned. It has been listed as an Extinct in the Wild species by the IUCN as of 2022.
Bryconops is a genus of freshwater fish in the family Iguanodectidae from South America. Various species of tetra are amongst its ranks, and are sometimes seen in the aquarium trade.
The eastern tubenose goby is a species of gobiid fish native to fresh and brackish waters of the basins of the Sea of Azov and the Caspian Sea and has invaded the upper reaches of the Volga River from its native occurrence in the delta. This species prefers slow flowing rivers or still waters with plentiful rocks or vegetation. It can reach a length of 9 centimetres (3.5 in) SL. It is probably the same species as that recently treated as Proterorhinus semipellucidus.
Gobio gobio, or the gudgeon, is a species of fish in the family Cyprinidae. This small fish is widely distributed in fresh-water streams and lakes across central and temperate Eurasia.
Hucho bleekeri, the Sichuan taimen, is a species of freshwater fish in the salmon family (Salmonidae), endemic to the Yangtze basin in China. Their typical habitat includes mountain streams and small rivers, typically being found in the catchment areas of the Dadu River in Sichuan and Qinghai Provinces, as well as the Hanjiang River. This particular fish population is largely threatened by habitat loss and illegal fishing, resulting in a "critically endangered" conservation status from the International Union for Conservation of Nature.
The Transcaucasian spirlin is a fish species in the family Cyprinidae. It is widespread in the Western Transcaucasia and rivers of the Black Sea coast in Turkey westward to the Kızılırmak River. It prefers rivers and streams with fast-running shallow water, over gravel, pebbles or rocks.
Alburnoides eichwaldii, also known as the South Caspian sprilin or Kura chub, is a fish species in the family Cyprinidae. It is widespread in the Western Asia in the river drainages of the southwestern Caspian coast from Samur down to rivers of the Lenkoran Province in Azerbaijan. It prefers streams and rivers in the foothills, with well oxygenated, fast-flowing waters, and spawns on gravel in swift currents.
The Ohrid spirlin is a fish species of family Cyprinidae. This species is endemic to Lake Ohrid in North Macedonia and Albania in the Balkans. It is a benthopelagic temperate freshwater fish, up to 9 cm in length. It was originally named as a subspecies of Alburnoides bipunctatus. It is threatened by non-indigenous species of fish, many of which have been introduced into Lake Ohrid.
Alburnoides idignensis, is a fish species of the family Cyprinidae endemic to Iran. It can be differentiated from its cogenerates by differences in fin ray and vertebral counts, together with other morphological characters. The specific name is derived from the Sumerian name for the River Tigris, "Idigna".
Alburnoides gmelini, the Dagestan spirlin, is a fish species of the family Cyprinidae, known from the western Caspian coast of southern Russia. I can be differentiated from its cogenerates by differences in fin ray and vertebral counts, together with other morphological characters. The specific bane honors Samuel Gottlieb Gmelin, a Russian-German naturalist who traveled through the River Don area and the Caucasus region and along the western and southern Caspian Sea coasts between 1768 and 1774.
Capoeta razii, is a newly described species of freshwater cyprinid fish occurring mainly in southern Caspian Sea basin, Iran. This species was mistakenly reported by many authors as Capoeta gracilis in northern Iranian regions. It was first reported to be different from Capoeta gracilis by Levin et al. (2012).
Samii's riffle minnow is a species of freshwater fish in the family Cyprinidae. It is endemic to the Sefidroud River drainage in Iran.
Bryconops alburnoides is a small freshwater fish, approximately 6 inches long at its largest, that lives in the rivers of South America. It has a slender body, with a yellowish dorsal fin and yellow-tinged back scales that fade into silver on its belly. It is largely an insectivore that picks land-dwelling insects from the riverbanks, though it eats much more whenever rain washes prey into the water.
Bryconops gracilis is a small species of freshwater fish from the rivers of South America. It is one of multiple species for which the common name "lambari" is used. Though not well-studied, it has been re-described in recent years in order to differentiate it from Bryconops alburnoides, a congener to which it bears a strong resemblance.
