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.
Cottus petiti, also called the chabot du Lez in French, is a species of freshwater ray-finned fish belonging to the family Cottidae, the typical sculpins. It is endemic to France, found only in a small 3 km stretch of the river Lez in Southern France near Montpellier. The natural habitat is fed by karstic springs which may have enabled the isolated survival of the population through geological history. Now the species may be threatened by habitat loss. The males of this species are typically 56 mm in length. This species was confirmed as a separate species from the European bullhead in 2005 by Jörg Freyhof, Maurice Kottelat and Arne W. Nolte. The specific name honours the zoologist and anatomist Georges Petit (zoologie) of the Muséum national d’Histoire naturelle.
Maurice Kottelat is a Swiss ichthyologist specializing in Eurasian freshwater fishes.
Cottus scaturigo, the Timavo sculpin, is a species of freshwater ray-finned fish belonging to the family Cottidae, the typical sculpins. It is endemic to the Timavo Spring in Italy. This species was described as a separate species from the European bullhead in 2005 by Jörg Freyhof, Maurice Kottelat and Arne W. Nolte. However, the Catalog of Fishes treats this taxon as a synonym of Cottus metae, although FishBase treats it as a separate species. The specific name scaturigo means “spouting water”, i.e. a spring, an allusion to the Timavo Spring.
The Menderes barbel is a species of ray-finned fish in the genus Luciobarbus from the Büyük Menderes River basin in Turkey.
Oxynoemacheilus bergianus, the Kura sportive loach, is a species of ray-finned fish in the genus Oxynoemacheilus. This species is found in Lake Urumiyeh and Namak Lake basins in Iran, in the southern Caspian basin from Kura east to the Sefid-Rud drainage. It can also be found in the headwaters of Tigris in Turkey, Iraq and in Karoun, Iran as well as those of the Euphrates in Turkey and possibly in Syria and Iraq. It lives in fast flowing streams and rivers with gravel and rocky substrates and does not tolerate impoundments, dam construction having been identified as a major potential threat to this species.
The Don tadpole-goby is a species of goby widespread in the basin of the Sea of Azov, specifically in the lower Don River and Tsimlyansk Reservoir. This species is found in rivers, reservoirs and river mouths, but is not known to enter seas. It is introduced and invasive upstream the Volga River, e.g. the Kuibyshev Reservoir. This fish can reach a length of 6.6 centimetres (2.6 in) SL. Life span is about one year.
The small-spine tadpole-goby is a species of goby, a small fish native to the eastern coasts of the Caspian Sea and the lower reaches of the Volga River up to Volgograd. In the sea it is recorded from the Cape Peschany to the Çeleken Peninsula and Ogurja Ada Island in the south. It is abundant the Volga River delta. This species can be found at depths down to 50 metres (160 ft) although the adults generally are not found deeper than 11 metres (36 ft). This species can reach a length of 6.6 centimetres (2.6 in) TL. The specific name honours the Azerbaijani ichthyologist A. A. Mahmudbekov, studied the fish of the Caspian Sea for much of his life.
The Caspian stellate tadpole-goby, also known as the starry goby, is a species of gobiid fish endemic to the Caspian Sea basin. It is widespread along all coasts of the Caspian Sea with exception of the central-eastern, and in the lowest part of the Volga River. In the southern part of the basin, it is mentioned near the Ogurja Ada, in the Gorgansky Bay, and in the Sefīd-Rūd River. This species can reach a length of 10 centimetres (3.9 in) SL.
Knipowitschia radovici, the Norin goby, is a species of goby endemic to Croatia where it only occurs in the drainage basin of the Neretva River, where adults inhabit the deepest parts of the rivers in the strongest current. This species can reach a length of 2.8 centimetres (1.1 in) SL. The specific name honours the Ornithologist Dragan Radović, a friend of the author, Marcelo Kovačić, who encouraged him to sample in the waterbodies of Croatia.
Iberian gudgeon is a species of gudgeon, a small freshwater in the family Cyprinidae. It is widespread only in the Iberian Peninsula where it is indigenous in the Ebro and Bidasoa drainage, and in France in the Adour drainage, as well as Andorra. It has been introduced throughout the Iberian Peninsula, including Portugal, It is a freshwater demersal fish, up to 11.9 cm long.
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 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.
Cottus rondeleti is a species of freshwater ray-finned fish belonging to the family Cottidae, the typical sculpins. This species is endemic to the coastal Hérault drainage of Southern France. The total known distribution comprises three distinct short stretches of stream, and the species considered critically endangered because of threat of drought that is promoted by water extraction and potentially by climate change.
Cottus duranii, the Dordogne sculpin or Chabot d’Auvergne, is a species of freshwater ray-finned fish belonging to the family Cottidae, the typical sculpins. It is found in France. It inhabits the Loire and Dordogne river drainages. It reaches a maximum length of 10.0 cm. It prefers streams with clear, cool, moderate to swift water and stone substrate. This species was described as a separate species from the European bullhead in 2005 by Jörg Freyhof, Maurice Kottelat and Arne W. Nolte. The specific name durani means “of Duranius”, the Latin name of the River Dordogne.
Cottus rhenanus is a species of freshwater ray-finned fish belonging to the family Cottidae, the typical sculpins. It is found in France, Belgium, Germany, Luxembourg, and the Netherlands. It inhabits the Rhine and Meuse river drainages. It reaches a maximum length of 10.0 cm. It prefers streams with clear, cool, moderate to swift water and stone substrate. Here, it mostly occurs in the shallow parts of streams. This species was described as a separate species from the European bullhead in 2005 by Jörg Freyhof, Maurice Kottelat and Arne W. Nolte. The specific name rhenatus means belonging to Rhenus, the Latin name of the River Rhine.
Cottus metae is a species of freshwater ray-finned fish belonging to the family Cottidae, the typical sculpins. It inhabits the upper Save River system in the Danube basin. It reaches a maximum length of 9.7 cm. It prefers small streams to medium-sized rivers. This species was described as a separate species from the European bullhead in 2005 by Jörg Freyhof, Maurice Kottelat and Arne W. Nolte. The specific name 'honours the Slovenian biologist Meta Povž, in recognition of her assistance to the authors in a variety of projects.
Cottus perifretum, the bullhead or miller’s thumb, is a species of freshwater ray-finned fish belonging to the family Cottidae, the typical sculpins. It is found on both sides of the English Channel, native to Great Britain. It also inhabits Atlantic drainages from the Garonne River to the Scheldt in France and Belgium, and the Moselle and Sieg in Germany. It is considered invasive in the Rhine drainage in Germany and the Netherlands. This invasive population in the Rhine is an intermediate between this species and Cottus rhenanus. Although this species is native to England and Wales it is considered to be a non-native invasive species in Scotland.
Cottus transsilvaniae is a species of freshwater ray-finned fish belonging to the family Cottidae, the typical sculpins. It is endemic to Romania in the upper Arges River in the Danube drainage. It reaches a maximum length of 9.7 cm. It prefers rocky shoals and riffles of small upland streams. his species was described as a separate species from the European bullhead in 2005 by Jörg Freyhof, Maurice Kottelat and Arne W. Nolte. The specific name transsilvaniae means “of Transsilvania”, the Latin name of the Transylvania.
The Danube delta gudgeon was a species of cyprinid fish endemic to the lower Danube in Romania and the Ukraine. It was last recorded in the 1960s, with many studies conducted in its home range, all failing to find the species.
