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 asp is a European freshwater fish of the Cyprinidae family. It is sometimes considered by taxonomic authorities to be one of two members of the genus Aspius. It is protected under Appendix III of the Bern Convention and listed as least concern on the IUCN Red List.
The European bullhead is a freshwater fish that is widely distributed in Europe, mainly in rivers. It is a member of the family Cottidae, a type of sculpin. It is also known as the miller's thumb, freshwater sculpin, common bullhead, and cob.
The Danube bleak or Caspian shemaya is a species of freshwater fish in the family Cyprinidae. It is found in Iran, Ukraine, Georgia, Armenia, Slovakia, Moldova, Greece, Czechia, Azerbaijan, Turkiye, Afghanistan, Austria, Bosnia and Herzegovina, Bulgaria, Croatia, Switzerland, Germany, Hungary, Italy, Romania, Russia, Serbia, Slovenia, Turkmenistan, and Uzbekistan.
The white-finned gudgeon is a species of freshwater fish in the family Cyprinidae. It lives in the North Caspian basin in lower parts of the Volga and Ural River drainages. They can reach 13 cm in length.
The Kessler's gudgeon is a European species of freshwater fish in the family Cyprinidae. It is found in the Danube and Vistula drainage basins, including parts of Poland, Austria, the Czech Republic, Ukraine, Bulgaria, Romania, Moldova, Hungary, Croatia, Bosnia and Herzegovina, Serbia, Montenegro, Slovakia, and Slovenia. It is a small fish of no economic or sporting importance. It was at one time classified as Gobio kessleri.
Eudontomyzon danfordi, the Carpathian brook lamprey or Danube lamprey, is a species of lamprey in the family Petromyzontidae. It is found in Austria, Bosnia and Herzegovina, Bulgaria, Croatia, Czech Republic, Hungary, Moldova, Romania, Serbia, Montenegro, Slovakia, and Ukraine. Unlike other brook lampreys, this fish is parasitic.
The Bayou darter is a rare species of freshwater ray-finned fish, a darter from the subfamily Etheostomatinae, part of the family Percidae, which also contains the perches, ruffes and pikeperches. It is endemic to western Mississippi in the United States, where it is found only in Bayou Pierre and its tributaries. Its typical habitat is fast-flowing creeks and streams, in riffles and in areas between riffles with firm gravel bottoms. It feeds on small insects and their larvae. Breeding probably takes place twice a year, in spring and late summer. The population of this fish is declining due to loss of suitable habitat. This is caused by siltation and pollution, particularly erosion caused by changes in land use. The International Union for Conservation of Nature has assessed its conservation status as being "endangered".
The Louisiana pearlshell, Margaritifera hembeli, is a rare species of bivalve mollusk in the family Margaritiferidae. This freshwater mussel is native to Louisiana in the United States, and was previously present also in Arkansas. It grows to a length of about 10 cm (4 in) and lives on the sand or gravel stream-bed in riffles and fast flowing stretches of small streams. Its life cycle involves a stage where it lives parasitically inside a fish. This mollusk is sensitive to increased sedimentation and cannot tolerate impoundments. Because of its limited range and its population decline, the International Union for Conservation of Nature has rated this mollusk as being "critically endangered".
Abbottina rivularis, also known as the Chinese false gudgeon or the Amur false gudgeon, is a species of ray-finned fish in the family Cyprinidae, the carps and minnows. It is native to China, Korea, and Japan, but it has been introduced to the Mekong River Basin and is also known from rivers in Turkmenistan.
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.
Romanogobio is a genus of cyprinid fish found in Europe and Asia.
Zingel zingel, the zingel, is a species of freshwater ray-finned fish in the family Percidae. It is found in fast-flowing streams in southeastern Europe. It is the type species of the genus Zingel.
The Danube whitefin gudgeon is a species of freshwater fish in the family Cyprinidae. It is distributed in the Danube drainage. The maximal length is 11.5 cm, maximal reported age 4 years.
The northern whitefin gudgeon is a species of freshwater fish in the family Cyprinidae. It is distributed in the northern Black Sea basin, southern Baltic Sea basin, southern North Sea basin. Also, reports from lakes Ilmen and Ladoga and its basins have been made, which are questionable. Their maximal length is 11.5 cm, with a maximal reported age of 5 years.
The Don whitefin gudgeon is a species of freshwater fish in the family Cyprinidae. It is distributed in the Don River basin in Russia, and also in the Siverskyi Donets River in Ukraine. The maximal length is 10.7 cm, maximal reported age 5 years.
The Danube delta gudgeon is a species of cyprinid fish endemic to the lower Danube in Bulgaria, Romania and Ukraine. It was last recorded in the 1960s, with many studies conducted in its home range, all failing to find the species, until in 2016 a specimen was collected from the Bulgarian sector of the Danube.
The South Caucasian gudgeon is a species of cyprinid fish found in the Kura and Aras drainages flowing to the southwest Caspian Sea from headwaters in Turkey down to lower reaches in Azerbaijan and Iran.
Romanogobio parvus is a species of cyprinid fish endemic to the Kuban River in Russia.
