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The huchen (''Hucho hucho'') (, from
German German(s) may refer to: * Germany (of or related to) **Germania (historical use) * Germans, citizens of Germany, people of German ancestry, or native speakers of the German language ** For citizens of Germany, see also German nationality law **Ge ...
), also known as Danube salmon or redfish (german: Rotfisch), is a large species of
freshwater fish Freshwater fish are those that spend some or all of their lives in fresh water, such as rivers and lakes, with a salinity of less than 1.05%. These environments differ from marine conditions in many ways, especially the difference in levels of s ...
in the salmon family of order
Salmoniformes Salmonidae is a family of ray-finned fish that constitutes the only currently extant family in the order Salmoniformes . It includes salmon (both Atlantic and Pacific species), trout (both ocean-going and landlocked), chars, freshwater whit ...
. It is the type species of its genus ''
Hucho ''Hucho'' is a genus of large piscivorous salmonid fish known as taimens (from Finnish through Russian ), and is closely related to Pacific trout and lenoks (all belonging to the same tribe in the subfamily Salmoninae). Native to the cold r ...
''.


Distribution and ecology

The huchen is endemic to the Danube basin in Europe where the remaining population is threatened primarily by river
damming A dam is a barrier that stops or restricts the flow of surface water or underground streams. Reservoirs created by dams not only suppress floods but also provide water for activities such as irrigation, human consumption, industrial use, a ...
, resulting in
habitat fragmentation Habitat fragmentation describes the emergence of discontinuities (fragmentation) in an organism's preferred environment (habitat), causing population fragmentation and ecosystem decay. Causes of habitat fragmentation include geological process ...
and loss through river impoundment and disruption of the longitudinal continuity of rivers, cutting away fish from its spawning grounds, with overfishing and fisheries mismanagement as an additional issue in many areas. Damming and all these other problems are especially visible in the Balkans. The upper reaches of the Danube basin, rivers and tributaries contain almost all of the recent population. This includes: *In
Austria Austria, , bar, Östareich officially the Republic of Austria, is a country in the southern part of Central Europe, lying in the Eastern Alps. It is a federation of nine states, one of which is the capital, Vienna, the most populous c ...
: the Inn river, the upper in
Lower Austria Lower Austria (german: Niederösterreich; Austro-Bavarian: ''Niedaöstareich'', ''Niedaestareich'') is one of the nine states of Austria, located in the northeastern corner of the country. Since 1986, the capital of Lower Austria has been Sankt P� ...
, with the lower Gail in
Carinthia Carinthia (german: Kärnten ; sl, Koroška ) is the southernmost Austrian state, in the Eastern Alps, and is noted for its mountains and lakes. The main language is German. Its regional dialects belong to the Southern Bavarian group. Carin ...
, the Pielach, in
Styria Styria (german: Steiermark ; Serbo-Croatian and sl, ; hu, Stájerország) is a state (''Bundesland'') in the southeast of Austria. With an area of , Styria is the second largest state of Austria, after Lower Austria. Styria is bordered to ...
the upper Mur. *In Germany: middle and lower Inn, Isar (especially in Munich) In the Balkans huchen still appears in following river systems: *In Slovenia: in the headwaters of Sava and its tributaries. *In Croatia: in the upper and middle course of
Kupa The Kupa () or Kolpa ( or ; from la, Colapis in Roman times; hu, Kulpa) river, a right tributary of the Sava, forms a natural border between north-west Croatia and southeast Slovenia. It is long, with its border part having a length of and ...
. *In
Bosnia and Herzegovina Bosnia and Herzegovina ( sh, / , ), abbreviated BiH () or B&H, sometimes called Bosnia–Herzegovina and often known informally as Bosnia, is a country at the crossroads of south and southeast Europe, located in the Balkans. Bosnia and He ...
: in the upper and middle Una, with the upper and middle Sana; the upper and middle Vrbas, with the lower and middle Vrbanja; the main channel of the Bosna lost its population due to degradation of its waters, its banks and riverbed, but its four main tributaries, the Krivaja, the Fojnička, the
Lašva The Lašva ( sr-cyrl, Лашва) is a river in Central Bosnia, Bosnia and Herzegovina. It is a left tributary of the Bosna.Vojnogeografski institut, Ed. (1955): Travnik (List karte 1:100.000, Izohipse na 20 m). Vojnogeografski institut, Beograd / ...
and the Željeznica, are still important habitats; one of the most important huchen habitats in Balkan and Europe is the Drina, with its numerous tributaries, especially the Lim, the Tara and the Ćehotina, and smaller ones, the Bistrica, the Prača, and the
Drinjača Drinjača (Serbian Cyrillic: Дрињача) is a left tributary of the Drina in eastern Bosnia and Herzegovina. It rises on the mountain of Konjuh (1,326 m) 15 km northeast of Kladanj at an elevation of about 1,000 m and ends after 87.5&nbs ...
; * In Serbia: the Lim. * In Montenegro: the Lim, with the Lake Plav, the Ćehotina, and the Tara. Some of these habitats, especially in the Balkans, are endangered with planned, or already implemented plans for construction of new dams and
hydroelectric power plant Hydroelectricity, or hydroelectric power, is electricity generated from hydropower (water power). Hydropower supplies one sixth of the world's electricity, almost 4500 TWh in 2020, which is more than all other renewable sources combined and ...
s, such as on the Lim in Serbia, or like in case of the river
Piva Piva may refer to: * Piva (river), a river in Montenegro and Bosnia and Herzegovina * Piva, Montenegro, a region in Montenegro and tribe * Piva River, Bougainville, Papua New Guinea * Piva Trail, Bougainville, Papua New Guinea ** Battle for Pi ...
in Montenegro and Bosnia and Herzegovina, whose respective populations were completely wiped out since mid 20th century. In some cases rehabilitation of parts of the habitat is attempted, through restoration of the river course. Such positive example is the part of the course of the river Inn, with some -long stretch around the Bavarian town of
Mühldorf Mühldorf am Inn (Central Bavarian: ''Muihdorf am Inn'') is a town in Bavaria, Germany, and the capital of the district Mühldorf on the river Inn. It is located at , and had a population of about 17,808 in 2005. History During the Middle Ag ...
was rebuilt and renaturalized and the huchen has returned in recent years. It has been introduced to other major river basins elsewhere on the continent and even North Africa, to rivers in Morocco, but these populations are not self-sustaining. Some evidence suggest that in historic times the huchen has also been found in the neighboring
Dniester The Dniester, ; rus, Дне́стр, links=1, Dnéstr, ˈdⁿʲestr; ro, Nistru; grc, Τύρᾱς, Tyrās, ; la, Tyrās, la, Danaster, label=none, ) ( ,) is a transboundary river in Eastern Europe. It runs first through Ukraine and th ...
basin. Huchen sometimes successfully establish in accessible natural lakes, like glacial Lake Plav which is the source of the Lim river in Montenegro, one of the major huchen habitats in the Balkans. However, the species sometimes survives even when cut off from the rest of the population in big dam reservoirs on mountain rivers, such as reservoirs on the Drina in Bosnia, or Lake Czorsztyn in Poland, as long as competitive and/or
allochthonous River ecosystems are flowing waters that drain the landscape, and include the biotic (living) interactions amongst plants, animals and micro-organisms, as well as abiotic (nonliving) physical and chemical interactions of its many parts.Angelier, ...
predator species are not introduced into the newly created lakes.


Appearance and behaviour

The huchen reaches about in length and more than in weight. The average length is between . The huchen has a slender body that is nearly round in cross-section. On the reddish brown back are several dark patches in an X or crescent shape, but most distinctive feature is fishes head, which is larger than in other salmonides (longer and wider), with large elongated mouth. Smaller fish feed on the larvae of water insects or on insects dropped into the water; the larger individuals are predators of other species of fish and other small vertebrates.


Historical occurrence

There is no international convention nor single agreed body concerned with verification of records and mandated with the task, however there are many modern and historical records for the largest huchen caught. Among these recorded is fish weighing , caught in February 1985 in
Spittal an der Drau Spittal an der Drau is a town in the western part of the Austrian federal state of Carinthia. It is the administrative centre of Spittal an der Drau District, Austria's second largest district (''Bezirk'') by area. Geography The town is located ...
in
Austria Austria, , bar, Östareich officially the Republic of Austria, is a country in the southern part of Central Europe, lying in the Eastern Alps. It is a federation of nine states, one of which is the capital, Vienna, the most populous c ...
,; also one weighing , which is stuffed and was probably grown on fish-farm in Austria for breeding. Other storied examples of recorded specimens with existing photographs and media reports include , caught in January 1938 by Bosnian railway worker and angler Halil Sofradžija at the Dragojevića Rapids on the Drina river, near the town of Ustikolina in Bosnia and Herzegovina. This case was recorded on photograph and reportage was later published in prime Serbian daily
Politika ''Politika'' ( sr-Cyrl, Политика; ''Politics'') is a Serbian daily newspaper, published in Belgrade. Founded in 1904 by Vladislav F. Ribnikar, it is the oldest daily newspaper still in circulation in the Balkans. Publishing and owners ...
on 23 February 1938. Dževat Šarkinović, angler from Plav, caught Danube salmon weighting , long, in late spring of 1985 in lake Plav, and gave it to Hotel "Plavsko jezero" who presented it at '' International Fair of Hunting and Fishing'' in Novi Sad where it was noted as a "world record". Today, this specimen stands as stuffed exhibit at the wall of hotel's foyer in Plav. Another recorded trophy from the Drina include huchen caught by angler Remzija Krkalić from Foča in 1940, weighing .


Reproduction

This permanent freshwater salmonid spawns in April, once water reaches a temperature of . For spawning, the huchen migrates up the river and enters small and shallow affluents, where females excavate depressions in the gravel into which they deposit their eggs, then a male releases a cloud of sperm and the female then covers the eggs with sand. Larvae hatch 30 to 35 days after fertilization.


Commercial breeding

There is a considerable effort to produce huchen
fry Fry, fries, Fry's or frying may refer to: Food and cooking * Frying, the cooking of food in hot oil or fat ** French fries, deep-fried potato strips ** Frying pan, cookware for frying Businesses and organizations * Fry (racing team), a British ...
commercially and to reintroduce the species into the wild with moderate to good success. This requires catching the adults just before spawning and keeping them in special tanks. Fry are released in appropriate places once they have reached .


References

{{Authority control Hucho Freshwater fish of Europe Fish described in 1758 Taxa named by Carl Linnaeus