| No. | Year | Latitude | Longitude | Catalog No. | Information |
| 1. | 2004 | 51.24 | 4.58 | FSJF 1384 | "Cottus perifretum. D. Knapen, G. Knaepkens, J. Freyhof & A. Nolte, FSJF 1384, Stream Witte Nete, Province Flandern, Compatible with distributional range" |
| 2. | 2004 | 51.25 | 4.58 | ZMB 33588 | "Cottus perifretum. D. Knapen, G. Knaepkens, J. Freyhof & A. Nolte, ZMB 33588, Stream Zwaanebeek, Province Flandern, Compatible with distributional range" |
| 3. | 2010 | 51.38 | 4.24 | FB 2819490 | "Neogobius melanostomus. , FB 2819490, River Scheldt near Zandvliet, " |
| 4. | 2010 | 50.95 | 5.32 | FB 2819489 | "Neogobius melanostomus. , FB 2819489, Albert Canal near Hasselt, " |
| 5. | 2010 | 51.29 | 4.30 | FB 2819488 | "Neogobius melanostomus. , FB 2819488, Tidal, mesohaline (3-4 ppt at the time of sampling) part of the River Scheldt near Liefkenshoektunnel., " |
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