Table 1
Summary of stocking practices conducted in the Sieg basin. For a detailed description of the stocking efforts, please see Appendices 2 and 3 in the Online Supplementary Material.
| Year | Reported region/stream of stock origin | Larger basin of stock origin | Introduced in major Sieg region: (foothill/ mountainous) |
Streams with singular stocking events |
Streams with annual stocking |
|---|---|---|---|---|---|
| 1981–1984 | Franconia (not further specified) | Main, Neckar (both Rhine) or Danube* | Foothill | Smaller tributaries like Eipbach, Wahnbach, Pleisbach, Naafbach | Sieg & Agger, Bröl system |
| 1982 | Upper Sieg above Siegen | Sieg (Rhine) | Mountainous | Lower Ferndorf | |
| 1982 | Lenne | Ruhr (Rhine) | Foothill | Sieg | |
| 1988–1999 | North-Rhine Westphalia (not further specified) | Sieg, Lippe or Ruhr (Rhine) | Foothill | Few smaller tributaries like Hanfbach | Sieg & Agger, Bröl |
| 1990 | Lenne | Ruhr (Rhine) | Mountainous | Ferndorf | |
| 1988–1992 | Kinzig | Main (Rhine) | Mountainous | Nister, Kleine Nister | |
| ∼1994–1999 (unclear) | Bigge (Lenne) | Ruhr (Rhine) | Mountainous | Heller | |
| ∼1995–1999 (unclear) | Lenne | Ruhr (Rhine) | Mountainous | Agger, possibly tributaries like Wiehl | |
| 2008 | Agger (foothill) | Sieg (Rhine) | Mountainous | Agger | |
| 2013 | Dill | Lahn (Rhine) | Mountainous | Littfe | |
| Since 2016 (each dry summer) | Sieg in Siegen | Sieg (Rhine) | Mountainous | Alche |
Based on the haplotype networks of COI sequences (Fig. 3), it can be concluded, that the stocked Phoxinus originated from the Rhine basin, and thus from the Neckar or Main catchment.
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