''Gymnocephalus ambriaelacus'' is a

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

of freshwater

ray-finned fish Actinopterygii (; ), members of which are known as ray-finned fishes, is a class of bony fish. They comprise over 50% of living vertebrate species. The ray-finned fishes are so called because their fins are webs of skin supported by bony or h ...

, a

ruffe The Eurasian ruffe (''Gymnocephalus cernua''), also known as ruffe or pope, is a freshwater fish found in temperate regions of Europe and northern Asia. It has been introduced into the Great Lakes of North America, reportedly with unfortuna ...

, from the

family Family (from la, familia) is a group of people related either by consanguinity (by recognized birth) or affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its members and of society. Idea ...

Percidae The Percidae are a family of ray-finned fish, part of the order Perciformes, which are found in fresh and brackish waters of the Northern Hemisphere. The majority are Nearctic, but there are also Palearctic species. The family contains more ...

which is

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found else ...

to Lake Ammersee, in the upper

Danube basin The Danube ( ; ) is a river that was once a long-standing frontier of the Roman Empire and today connects 10 European countries, running through their territories or being a border. Originating in Germany, the Danube flows southeast for , pa ...

in southern

Germany Germany,, officially the Federal Republic of Germany, is a country in Central Europe. It is the second most populous country in Europe after Russia, and the most populous member state of the European Union. Germany is situated betwe ...

. This species can reach a length is ( SL). The species is classified as Critically Endangered as its population is declining following the introduction of the

(''Gymnocephalus cernua''). Some authorities suggest that this taxon may be synonymous with the

Balon's ruffe Balon's ruffe (''Gymnocephalus baloni''), also known as the Danube ruffe, is a species of freshwater ray-finned fish, a ruffe, from the family Percidae which is native to the drainages of the Danube from delta to Germany and the Dnieper from delt ...

(''G. baloni'').

References

External links

* ambriaelacus Freshwater fish Fish of Europe Endemic fauna of Germany Taxa named by Matthias F. Geiger Taxa named by Ulrich K. Schliewen Fish described in 2010 {{Percidae-stub