Which water system defines the eastern boundary of the historical Wels catfish native distribution?
Answer
Aral Sea drainage
The native range of the Wels catfish historically spanned significant parts of Continental Europe and Western Asia. The text explicitly states that this distribution extends eastwards all the way to the Aral Sea drainage. This geographical marker defines the furthest eastern limit of where the species naturally occurred, distinguishing it from other major water bodies like the Caspian Sea or regions accessed via the Black Sea basin. Understanding this native extent is important for differentiating natural populations from introduced ones.
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