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70-568: The Mühlviertel consists of the four Upper Austrian districts that lie north of the river Danube : Rohrbach , Urfahr-Umgebung , Freistadt and Perg . The parts of the state capital Linz that lie north of the Danube also belong to the Mühlviertel. Geologically it is a part of the Bohemian Massif . Major towns include Rohrbach , Bad Leonfelden , Freistadt and Perg . The region was the site of

140-549: A "dirty dozen" non-native species most likely to harm native wildlife along rivers in Great Britain. Their success in establishing themselves was owed to a number of factors, one of which is that they are particularly well adapted to life in the slow-flowing, sparsely vegetated, rather murky waters that comprise so many of the British lowland rivers. Zander thrive in water with rather low visibility, unlike pike, which often dominate

210-451: A conservation measure, the law regulates the minimum size of zander considered mature enough to be eaten. In July 2009, in a rare occurrence, a zander bit bathers swimming in the Swiss part of Lake Maggiore , sending two people to the emergency room; the worst bite inflicted a wound about 10 centimeters long. The 70-cm 8-kg fish was later caught by the local police who cooked it and offered it to

280-505: A delicate flavour. Although it is not generally bred for food, its adaptability makes zander fishery quite sustainable. Indeed, in some regions release of young zanders is restricted, as natural stocks already provide a sufficient supply for the market, while boosting the population of this large predator would have an adverse effect on populations of its prey. Zander is especially well suited for fish fillets . It can also be served whole, baked, smoked or cooked. In some culinary circles, zander

350-511: A hypothetical Thracian * Donaris . The Proto-Indo-European root of this presumed name is related to the Iranic word " don- "/" dan- ", while the supposed suffix -aris is encountered in the ancient name of the Ialomița River , Naparis , and in the unidentified Miliare river mentioned by Jordanes in his Getica . Gábor Vékony says that this hypothesis is not plausible, because

420-571: A notorious war crime at the end of World War II in which hundreds of starving Soviet POWs escaped from nearby Mauthausen concentration camp and were pursued and murdered around Mühlviertel. The SS referred to the event as the Mühlviertler Hasenjagd ("Mühlviertel rabbit hunt"). During the Allied occupation of Austria after World War II, the Mühlviertel belonged to the Soviet occupation zone, and

490-585: A single flat spine on the operculum . Like other members of the perch family the zander has a split dorsal fin with the first dorsal fin having 13–20 spines and 18–24 soft rays, while the anal fin has 2–3 rays and 10–14 soft rays. The caudal fin is long and forked. The zander has a maximum published standard length 100 centimetres (39 in), although they are more commonly found at around 50 centimetres (20 in). This species can reach 20 kg (44 lb) of weight, although typical catches are considerably smaller. The IGFA All-Tackle world record zander

560-521: Is 4,152 km (1,603 sq mi), of which 3,446 km (1,331 sq mi) are in Romania. If one includes the lagoons of Razim-Sinoe (1,015 km (392 sq mi) of which 865 km (334 sq mi) water surface), which are located south of the delta proper, but are related to it geologically and ecologically (their combined territory is part of the World Heritage Site),

630-446: Is a species of ray-finned fish from the family Percidae , which also includes perch , ruffe and darter . It is found in freshwater and brackish habitats in western Eurasia . It is a popular game fish and has been introduced to a variety of localities outside its native range. It is the type species of the genus Sander . The zander was first formally described in 1758 as Perca lucioperca by Carolus Linnaeus in volume 1 of

700-641: Is also home to numerous diverse carp and sturgeon , as well as salmon and trout . A few species of euryhaline fish, such as European seabass , mullet , and eel , inhabit the Danube Delta and the lower portion of the river. Today the river carries its name from its source confluence in Donaueschingen , Germany , to its discharge into the Black Sea via the Danube Delta in Romania and Ukraine . The river

770-476: Is appreciated even more highly than salmon. Even the offals can be cooked into consommé . In 2004, it was revealed that some restaurants in the Minneapolis-St. Paul area of Minnesota were serving imported zander instead of the closely related North American walleye (the state fish, and a popular food in the region). While zander and walleye are almost indistinguishable by taste, the restaurants were selling

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840-612: Is divided into three main parts, separated by "gates" where the river is forced to cut through mountainous sections: Mean annual discharge on the hydrological stations (period from 2000 to 2023); 1 - Reni , Isaccea ; 2 - Silistra ; 3 - Pristol ; 4 - Batina , Bezdan ; 5 - Nagymaros , Szob ; 6 - Bratislava , Wolfsthal ; 7 - Untergriesbach Multiannual average, minimum and maximum discharge (water period from 1876 to 2010) Simulated water and suspended sediment results from climate-driven decadal study (with STD through specific decade): P – Simulated average precipitation in

910-588: Is estimated that the Danube upper course will one day disappear entirely in favor of the Rhine, an event called stream capturing . The hydrological parameters of Danube are regularly monitored in Croatia at Batina , Dalj , Vukovar and Ilok . The Danube basin was the site of some of the earliest human cultures. The Danubian Neolithic cultures include the Linear Pottery cultures of the mid-Danube basin. Many sites of

980-458: Is green-brown in colour and this extends onto the sides as dark vertical bars, in a pattern not dissimilar to that of the European perch ( Perca fluviatilis ) while the lower part of the body is creamy-white. Their caudal fin is dark and the pectoral , pelvic and anal fins are paler off-white in colour. The dorsal and caudal fins are marked with rows of black spots on the membranes between

1050-490: Is in April and May, although exceptionally they may spawn from late February through to July, and the actual period depends on latitude and altitude. The determining factor is that it needs temperatures to reach 10–14 °C (50–57 °F) before spawning starts. Zander have a maximum lifespan of 17 year and they are sexually mature at 3–10 years old, with 4 years old being typical. A large number of parasites are known to infect

1120-733: Is in Finland. It has been introduced to Great Britain, southern Europe, and continental Europe west of the Elbe, Ebro, Tagus and Jucar drainages, as well as to Anatolia, North Africa, Siberia, Kyrgyzstan, and Kazakhstan. In the UK, zander was originally introduced in 1878 by Francis Russell, 9th Duke of Bedford , into lakes on his Woburn Abbey estate and soon after that into the Great Ouse Relief Channel in The Fens . British Waterways included zander among

1190-653: Is to implement the Danube River Protection Convention by promoting and coordinating sustainable and equitable water management, including conservation, improvement, and rational use of waters and the implementation of the EU Water Framework Directive and the Danube Strategy . The Danube Commission is concerned with the maintenance and improvement of the river's navigation conditions. It was established in 1948 by seven countries bordering

1260-672: The Argonautica by Apollonius Rhodos (Argon. IV. 282). At the end of the Okeanos Potamos , is the holy island of Alba (Leuke, Pytho Nisi, Isle of Snakes ), sacred to the Pelasgian (and later, Greek) Apollo, greeting the sun rising in the east. Hecateus Abderitas refers to Apollo's island from the region of the Hyperboreans, in the Okeanos. It was on Leuke, in one version of his legend, that

1330-464: The Black Sea via the Danube Delta in Romania and Ukraine . Once a long-standing frontier of the Roman Empire , the river passes through or touches the borders of 10 countries. Its drainage basin extends into nine more (ten if Kosovo is included). In addition to the bordering countries (see above), the drainage basin includes parts of nine more countries: Bosnia and Herzegovina (4.6% of

1400-559: The Bystroye Canal . In 2022, there was a major heat wave in Europe. As a result, there was less water flowing in the rivers. As the water level decreased, a number of ship wrecks from World War II emerged in the Danube River. Many of the ships were from Nazi Germany 's Black Sea Fleet and had been scuttled to stop them from falling into enemy hands. The International Commission for

1470-571: The Celtic ' danu ' or ' don ' (both Celtic gods), which itself derived from the Proto-Indo-European * deh₂nu . Other European river names from the same root include the Dunaj, Dzvina/ Daugava , Don , Donets , Dnieper , Dniestr , Dysna and Tana/Deatnu . In Rigvedic Sanskrit , danu (दनु) means "fluid, dewdrop" and danuja (दनु-ज) means "born from danu " or "born from dew-drops". In Avestan ,

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1540-682: The Danubian Limes was the northeastern border of the Empire, with occasional interruptions such as the fall of the Danubian Limes in 259. The crossing of the Danube into Dacia was achieved by the Imperium Romanum , first in two battles in 102 and then in 106 after the construction of a bridge in 101 near the garrison town of Drobeta at the Iron Gate. This victory over Dacia under Decebalus enabled

1610-783: The Government of Ontario is preemptively treating zander as a future invasive species. In the Netherlands, zander may be found (natively) in many major waterways, including the Waal , Hollands Diep , and other distributaries or estuaries of the Rhine, and are also particularly common in the canals of Amsterdam. Zander inhabit freshwater bodies, especially large rivers and eutrophic lakes. They can tolerate brackish water and will make use of coastal lakes and estuaries. Individuals living in brackish water habitats migrate upriver, as far as 250 kilometres (160 miles) for spawning. Zander are carnivorous and

1680-621: The Habsburg monarchy , Polish–Lithuanian Commonwealth , and Russian Empire for controlling the Danube ( Tuna in Turkish ), which became the northern border of the Ottoman Empire for centuries. Many of the Ottoman–Hungarian Wars (1366–1526) and Ottoman–Habsburg wars (1526–1791) were fought along the river. Zander The zander ( Sander lucioperca ), sander or pikeperch ,

1750-755: The Volga in Russia . It flows through Central and Southeastern Europe , from the Black Forest south into the Black Sea . A large and historically important river, it was once a frontier of the Roman Empire . In the 21st century, it connects ten European countries, running through their territories or marking a border. Originating in Germany , the Danube flows southeast for 2,850 km (1,770 mi), passing through or bordering Austria , Slovakia , Hungary , Croatia , Serbia , Romania , Bulgaria , Moldova , and Ukraine . Among

1820-499: The 1960s and 1970s, leading to decreases in populations of native cyprinids . Recorded predators of the zander include other zanders, as well as European eels ( Anguilla anguilla ), Northern pike, European perch, the wels catfish ( Silurus glanis ) and the Caspian seal ( Phoca caspia ). The zander is considered one of the most valuable food fish native to Europe. It is esteemed for its light, firm but tender meat with few bones and

1890-431: The Danube basin; T – Simulated average temperature in the Danube basin; Q – Simulated average discharge in the Danube River at delta; S – Simulated sediment load in the Danube River at delta ; Historical average flow to the present day; Measured and reconstructed average water flows from 1742. The reconstructed and observed streamflow (Q – m /s) at Ceatal Izmail for the 1742 to 2022: The land drained by

1960-1035: The Danube extends into many other countries. Many Danubian tributaries are important rivers in their own right, navigable by barges and other shallow-draught boats. From its source to its outlet into the Black Sea, its main tributaries are (as they enter): 18. Tisza (entering near Titel ) 19. Sava (entering at Belgrade ) 20. Timiș (river) (entering at Pančevo ) 21. Great Morava (entering near Smederevo ) 22. Mlava (entering near Kostolac ) 23. Karaš (entering near Banatska Palanka ) 24. Jiu (entering at Bechet ) 25. Iskar (entering near Gigen ) 26. Olt (entering at Turnu Măgurele ) 27. Osam (entering near Nikopol, Bulgaria ) 28. Yantra (entering near Svishtov ) 29. Argeș (entering at Oltenița ) 30. Ialomița 31. Siret (entering near Galați ) 32. Prut (entering near Galați ) The Danube flows through many cities, including four national capitals (shown below in bold), more than any other river in

2030-632: The Danube has been a traditional trade route in Europe. Today, 2,415 km (1,501 mi) of its total length are navigable. The Danube is linked to the North Sea via the Rhine–Main–Danube Canal , connecting the Danube at Kelheim with the Main at Bamberg . The river is also an important source of hydropower and drinking water . The Danube river basin is home to such fish species as pike , zander , huchen , Wels catfish , burbot and tench . It

2100-627: The Danube was variously known as Danubius , Danuvius , Ister or Hister . The Latin name is masculine, as are all its Slavic names, except Slovene (the name of the Rhine is also masculine in Latin, most of the Slavic languages, as well as in German). The German Donau ( Early Modern German Donaw , Tonaw , Middle High German Tuonowe ) is feminine, as it has been re-interpreted as containing

2170-591: The Danube's, today subsurface rivers carry much water from the Danube to the Rhine. On many days in the summer, when the Danube carries little water, it completely oozes away noisily into these underground channels at two locations in the Swabian Alb, which are referred to as the Donauversickerung ( Danube Sink ). Most of this water resurfaces only 12 km (7.5 mi) south at the Aachtopf , Germany's wellspring with

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2240-512: The Danube. Today the Commission include riparian and non-riparian states. Although the headwaters of the Danube are relatively small today, geologically, the Danube is much older than the Rhine , with which its catchment area competes in today's southern Germany. This has a few interesting geological complications. Since the Rhine is the only river rising in the Alps mountains which flows north towards

2310-514: The European clade the Volga pikeperch ( S. volgaensis ) is the most basal taxon and shares features with the North American clade, such as being a broadcast spawner. In contrast in the zander and the estuarine perch ( S. marinus ) the males build nests and the female spawn into these nests and the males then guard the eggs and fry. The lineage leading to the zander is thought to have diverged from

2380-504: The European fish under the name "walleye", which is an illegal practice. An investigation by the U.S. Food and Drug Administration followed. In Ohio, many restaurants were caught using juvenile zander fillets in the 40 to 80 gram range in place of the Lake Erie yellow perch . Shortages of the perch along with skyrocketing prices caused wholesalers and restaurants to use the juvenile zander for popular "pike perch fillets". In Finland , as

2450-680: The Greeks borrowed the Istros form from the native Thracians. He proposes that the Romanian name is a loanword from a Turkic language ( Cuman or Pecheneg ). Classified as an international waterway , it originates in the town of Donaueschingen , in the Black Forest of Germany , at the confluence of the rivers Brigach and Breg . The Danube then flows southeast for about 2,730 km (1,700 mi), passing through four capital cities ( Vienna , Bratislava , Budapest , and Belgrade ) before emptying into

2520-702: The North Sea, an invisible line beginning at Piz Lunghin divides large parts of southern Germany, which is sometimes referred to as the European Watershed . Before the last ice age in the Pleistocene , the Rhine started at the southwestern tip of the Black Forest, while the waters from the Alps that today feed the Rhine were carried east by the so-called Urdonau (original Danube). Parts of this ancient river's bed, which

2590-590: The Protection of the Danube River (ICPDR) is an organization that consists of 14 member states (Germany, Austria, the Czech Republic, Slovakia, Slovenia, Hungary, Croatia, Bosnia and Herzegovina, Serbia, Bulgaria, Romania, Moldova, Montenegro, and Ukraine) and the European Union . The commission, established in 1998, deals with the whole Danube river basin, which includes tributaries and groundwater resources. Its goal

2660-626: The Province of Dacia to be created, but in 271 it was abandoned by emperor Aurelian . Avars used the river as their southeastern border in the 6th century. Part of the rivers Danubius or Istros was also known as (together with the Black Sea) the Okeanos in ancient times, being called the Okeanos Potamos (Okeanos River). The lower Danube was also called the Keras Okeanoio (Gulf or Horn of Okeanos) in

2730-680: The Serbian and the Romanian stretches of the Danube. However, the transgressions may not be considered acts of piracy, as defined according to the United Nations Convention on the Law of the Sea , but rather instances of "river robbery". On the other hand, media reports say the crews on transport ships often steal and sell their own cargo and then blame the plundering on "pirates", and the alleged attacks are not piracy but small-time contraband theft along

2800-597: The United Kingdom zander thrive in canals where the water is turbid due to the boat traffic and although their favoured prey in these waters is common roach they have a high impact on the populations of gudgeon ( Gobio gobio ). The zander spawns over gravel in flowing water, the males defend a territory in which they dig shallow depressions in sand or gravel which are roughly 50 centimetres (20 in) across and 5–10 centimetres (2.0–3.9 in) in depth in sand or gravel. They will also nest among exposed plant roots and

2870-523: The adults feed on smaller schooling fish. Studies around the Baltic Sea have found them to prey on the European smelt ( Osmerus eperlanus ), ruffe ( Gymnocephalus cernua ), European perch, vendace ( Coregonus albula ) and the common roach ( Rutilus rutilus ), They were also found to be cannibalistic on smaller zanders. They have also been recorded feeding on smolts of sea trout ( Salmo trutta morph. trutta ) and Atlantic salmon ( Salmo salar ). In

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2940-603: The basin area), the Czech Republic (2.9%), Slovenia (2.0%), Montenegro (0.9%), Switzerland (0.2%), Italy (<0.15%), Poland (<0.1%), North Macedonia (<0.1%) and Albania (<0.1%). The total drainage basin is 801,463 km (309,447 sq mi) in area, and is home to 83 million people. The highest point of the drainage basin is the summit of Piz Bernina at the Italy–Switzerland border , at 4,049 m (13,284 ft). The Danube River Basin

3010-501: The common ancestor with the Volga pikeperch circa 13.8 million years ago while the split from the estuarine perch took place around 9.1 million years ago. The zander is the largest member of the Percidae and it usually has a long and muscular body which bears some resemblance to a Northern pike ( Esox lucius ), hence the alternative English common name of pikeperch. The upper part of its body

3080-471: The distance to the Black Sea by 400 km (250 mi); the Rhine–Main–Danube Canal is about 171 km (106 mi), finished in 1992, linking the North Sea to the Black Sea. A Danube-Aegean canal has been proposed. Danube River cruise for sightseeing is popular, especially between Passau , Germany, to Budapest , Hungary. In 2010–12, shipping companies, especially from Ukraine, claimed that their vessels suffered from "regular pirate attacks " on

3150-415: The eggs are laid onto these roots. The nests are normally at depths of 1 to 3 metres (39 to 118 in) in turbid water. Spawning takes place in pairs, at night and at daybreak. When they are spawning the female is stationary above the male's nest and the male rapidly swims around her, keeping a distance of around 1 metre (3.3 ft) from the nesting depression. The male then orients himself perpendicular to

3220-477: The gorge) by the Iron Gate II Hydroelectric Power Station . On 13 April 2006, a record peak discharge at Iron Gate Dam reached 15,400 m /s (540,000 cu ft/s). There are three artificial waterways built on the Danube: the Danube-Tisa-Danube Canal (DTD) in the Banat and Bačka regions ( Vojvodina , northern province of Serbia); the 64 km (40 mi) Danube-Black Sea Canal , between Cernavodă and Constanța (Romania) finished in 1984, shortens

3290-416: The hero Achilles was buried (to this day, one of the mouths of the Danube is called Chilia). Old Romanian folk songs recount a white monastery on a white island with nine priests. Between the late 14th and late 19th centuries, the Ottoman Empire competed first with the Kingdom of Serbia , Second Bulgarian Empire , Kingdom of Hungary , Principality of Wallachia , Principality of Moldavia and later with

3360-423: The highest flow, an average of 8,500 L/s (300 cu ft/s), north of Lake Constance —thus feeding the Rhine. The European Water Divide applies only for those waters that pass beyond this point, and only during the days of the year when the Danube carries enough water to survive the sinkholes in the Donauversickerung. Since such large volumes of underground water erode much of the surrounding limestone, it

3430-431: The latter was further borrowed into Romanian as a regionalism ( Turlă ). The Thraco- Phrygian name was Matoas , "the bringer of luck". The Middle Mongolian name for the Danube was transliterated as Tho-na in 1829 by Jean-Pierre Abel-Rémusat . The modern languages spoken in the Danube basin all use names derived from the Latin name Danubius : Danube is an Old European river name derived from

3500-431: The many cities on the river are four national capitals: Vienna , Bratislava , Budapest , and Belgrade . Its drainage basin amounts to 817,000 km (315,000 sq mi) and extends into nine more countries. The Danube's longest headstream Breg rises in Furtwangen im Schwarzwald , while the river carries its name from its source confluence in the palace park in Donaueschingen onwards. Since ancient times,

3570-409: The northern barbarian Thracian and Illyrian tribes by advancing from Macedonia as far as the Danube in 336 BCE. Under the Romans, the Danube formed the border of the Empire with the tribes to the north almost from its source to its mouth. At the same time, it was a route for the transport of troops and the supply of settlements downstream. From 37 CE to the reign of the Emperor Valentinian I (364–375)

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3640-422: The predator fish niche in clear water. However, zander need plenty of oxygen and soon disappear from eutrophic areas. Zander were stocked in Spiritwood Lake, North Dakota in 1989 and have remained ever since. Ecologists believe that if establishment occurs in the Great Lakes they will compete with game fish such as the closely related Walleye or the Yellow perch for food and habitat . Therefore

3710-422: The rest of Upper Austria belonged to the American occupation zone. 48°25′N 14°25′E  /  48.417°N 14.417°E  / 48.417; 14.417 This Upper Austria location article is a stub . You can help Misplaced Pages by expanding it . Danube The Danube ( / ˈ d æ n . j uː b / DAN -yoob ; see also other names ) is the second-longest river in Europe , after

3780-465: The river has been part of a trans-European waterway from Rotterdam on the North Sea to Sulina on the Black Sea, a distance of 3,500 km (2,200 mi). In 1994 the Danube was declared one of ten Pan-European transport corridors , routes in Central and Eastern Europe that required major investment over the following ten to fifteen years. The amount of goods transported on the Danube increased to about 100 million tons in 1987. In 1999, transport on

3850-481: The river was made difficult by the NATO bombing of three bridges in Serbia during the Kosovo War . Clearance of the resulting debris was completed in 2002, and a temporary pontoon bridge that hampered navigation was removed in 2005. At the Iron Gate , the Danube flows through a gorge that forms part of the boundary between Serbia and Romania; it contains the Iron Gate I Hydroelectric Power Station dam, followed at about 60 km (37 mi) downstream (outside

3920-426: The river. The Danube Delta ( Romanian : Delta Dunării pronounced [ˈdelta ˈdunərij] ; Ukrainian : Дельта Дунаю , romanized :  Del'ta Dunayu ) is the largest river delta in the European Union . The greater part of the Danube Delta lies in Romania (Tulcea county), while its northern part, on the left bank of the Chilia arm, is situated in Ukraine (Odesa Oblast). The approximate surface

3990-443: The river. Members include representatives from Austria, Bulgaria, Croatia, Germany, Hungary, Moldova, Slovakia, Romania, Russia, Ukraine, and Serbia; it meets regularly twice a year. It also convenes groups of experts to consider items provided for in the commission's working plans. The commission dates to the Paris Conferences of 1856 and 1921, which established for the first time an international regime to safeguard free navigation on

4060-491: The same word means "river". The Finnish word for Danube is Tonava , which is most likely derived from the name of the river in German , Donau . Its Sámi name Deatnu means "Great River". It is possible that dānu in Scythian as in Avestan was a generic word for "river": Dnieper and Dniestr , from Danapris and Danastius , are presumed to continue Scythian * dānu apara "far river" and * dānu nazdya- "near river", respectively. In Latin,

4130-427: The sixth-to-third millennium BCE Vinča culture (Vinča, Serbia), are sited along the Danube. The third millennium BCE Vučedol culture (from the Vučedol site near Vukovar , Croatia ) is famous for its ceramics. Darius the Great , king of Persia , crossed the river in the late 6th century BCE to invade European Scythia and to subdue the Scythians . Alexander the Great defeated the Triballian king Syrmus and

4200-401: The spines and rays, these are largest and most obvious on the first dorsal fin. The juveniles are silvery in colour, becoming darker as they age. They have powerful jaws which are armed with many sharp teeth with two long canines in the front of each jaw. They have large bulbous eyes which are opaque when the fish is living in particularly turbid conditions, an adaptation to low light. There is

4270-424: The substrate and the pair swim around swiftly, releasing the eggs and sperm. The female departs after releasing her eggs. The male remains at the nest and defends it, fanning the eggs using the pectoral fins. Each female lays all of her eggs at once and only spawns once a year. The larvae are attracted to light and after they leave the nest they feed on zooplankton and small pelagic animals. They normal spawning season

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4340-415: The suffix -ouwe "wetland". Romanian differs from other surrounding languages in designating the river with a feminine term, Dunărea ( IPA: [ˈdunəre̯a] ). This form was not inherited from Latin, although Romanian is a Romance language. To explain the loss of the Latin name, scholars who suppose that Romanian developed near the large river propose that the Romanian name descends from

4410-456: The tenth edition of Systema Naturae and he gave the type locality as "European lakes". When Lorenz Oken (1779–1851) created the genus Sander he made Perca lucioperca its type species . The zander is part of the European clade within the genus Sander which split from a common ancestor with the North American clade, which the walleye ( S. vitreus ) and the sauger ( S. canadensis ) belong to, around 20.8 million years ago. Within

4480-490: The total area of the Danube Delta reaches 5,165 km (1,994 sq mi). The Danube Delta is also the best-preserved river delta in Europe, a UNESCO World Heritage Site (since 1991) and a Ramsar Site . Its lakes and marshes support 45 freshwater fish species. Its wetlands support vast flocks of migratory birds of over 300 species, including the endangered pygmy cormorant ( Phalacrocorax pygmaeus ). These are threatened by rival canalization and drainage schemes such as

4550-639: The tourists for the trouble it caused. As the largest member of the perch family, zander is a popular game fish in the United Kingdom. However, it is legally a non-native invasive species ; any zander caught by anglers must be destroyed. Increasing demand for zander for human consumption has attracted great attention of fish farmers. Today, elaborated protocols for the reproduction and on-growing of zander are available. Throughout Europe, an increasing number of aquaculture facilities produce zander for stocking or human consumption, mainly in recirculating aquaculture systems (RAS). Production volume remains low, but

4620-431: The world. Ordered from the source to the mouth they are: The Danube is navigable by ocean ships from the Black Sea to Brăila in Romania (the maritime river sector), and further on by river ships to Kelheim , Bavaria , Germany; smaller craft can navigate further upstream to Ulm , Württemberg , Germany. About 60 of its tributaries are also navigable. Since the completion of the German Rhine–Main–Danube Canal in 1992,

4690-413: The zander's skin, eyes and internal organs. Its gastrointestinal tract can host the nematode Anisakis , which can be transmitted to humans if the fish is smoked, fried or otherwise cooked at temperatures lower than 50 °C (122 °F). The zander is also a vector of the trematode Bucephalus polymorphus and may have been responsible for spreading the parasite to some French river systems during

4760-404: Was caught in Lago Maggiore, Switzerland in June 2016 weighing 11.48 kg (25.3 lb). Zander reach an average length of 40–80 cm (15.5–31.5 in) with a maximum length of 120 cm (47 in). The zander is very widely distributed across Eurasia, occurring in the drainages of the Caspian, Baltic, Black, Aral, North and Aegean Sea basins. The northern boundary of its distribution

4830-450: Was known to the ancient Greeks as the Istros ( Ἴστρος ) from a root possibly also encountered in the ancient name of the Dniester ( Danaster in Latin, Tiras in Greek) and akin to Iranic turos 'swift' and Sanskrit iṣiras ( इषिरस् ) 'swift', from the PIE * isro- , * sreu 'to flow'. In the Middle Ages, the Greek Tiras was borrowed into Italian as Tyrlo and into Turkic languages as Tyrla ;

4900-414: Was much larger than today's Danube, can still be seen in (now waterless) canyons in today's landscape of the Swabian Alb . After the Upper Rhine valley had been eroded, most waters from the Alps changed their direction and began feeding the Rhine. Today's upper Danube is thus an underfit stream . Since the Swabian Alb is largely shaped of porous limestone , and since the Rhine's level is much lower than

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