| ● | Soort aangetroffen |
○ | Soort niet aangetroffen |
‒ | Geen gegevens |
| Waterlichaam |
1989 |
1990 |
1991 |
1992 |
1993 |
1994 |
1995 |
1996 |
1997 |
1998 |
1999 |
2000 |
2001 |
2002 |
2003 |
2004 |
2005 |
2006 |
2007 |
2008 |
2009 |
2010 |
2011 |
2012 |
2013 |
2014 |
2015 |
2016 |
2017 |
2018 |
2019 |
2020 |
2021 |
2022 |
2023 |
| Bedijkte Maas |
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
○
|
○
|
○
|
○
|
○
|
‒
|
‒
|
●
|
‒
|
●
|
●
|
●
|
‒
|
●
|
●
|
●
|
●
|
| Beneden Maas |
‒
|
‒
|
○
|
‒
|
○
|
‒
|
○
|
‒
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
| Bovenrijn, Waal |
‒
|
‒
|
‒
|
○
|
‒
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
| Brabantse Biesbosch |
‒
|
‒
|
‒
|
○
|
○
|
○
|
‒
|
○
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
●
|
‒
|
‒
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
| Dordtse Biesbosch |
‒
|
‒
|
‒
|
○
|
‒
|
○
|
‒
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
| Haringvliet-oost |
‒
|
‒
|
‒
|
‒
|
‒
|
○
|
‒
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
| Haringvliet-west |
‒
|
‒
|
‒
|
○
|
‒
|
○
|
‒
|
○
|
‒
|
‒
|
‒
|
○
|
○
|
○
|
○
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
○
|
○
|
●
|
●
|
○
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
| IJssel |
‒
|
‒
|
‒
|
○
|
‒
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
| IJsselmeer |
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
| Ketelmeer en Vossemeer |
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
○
|
‒
|
‒
|
●
|
‒
|
‒
|
●
|
‒
|
‒
|
●
|
‒
|
‒
|
●
|
‒
|
‒
|
●
|
| Markermeer |
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
●
|
○
|
○
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
| Nederrijn, Lek |
‒
|
‒
|
‒
|
○
|
‒
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
| Nieuwe Waterweg |
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
○
|
○
|
●
|
●
|
○
|
●
|
●
|
○
|
●
|
○
|
○
|
●
|
| Noordzeekanaal |
‒
|
‒
|
‒
|
‒
|
○
|
‒
|
○
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
○
|
‒
|
‒
|
○
|
‒
|
‒
|
○
|
‒
|
○
|
○
|
●
|
‒
|
○
|
‒
|
‒
|
●
|
| Oude Maas |
‒
|
‒
|
‒
|
○
|
‒
|
○
|
‒
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
| Randmeren-Oost |
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
○
|
‒
|
‒
|
○
|
‒
|
‒
|
●
|
‒
|
‒
|
●
|
‒
|
‒
|
●
|
‒
|
‒
|
●
|
‒
|
| Randmeren-Zuid |
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
○
|
‒
|
‒
|
●
|
‒
|
‒
|
●
|
‒
|
‒
|
●
|
●
|
●
|
●
|
‒
|
‒
|
| Vecht-Zwarte Water |
‒
|
‒
|
○
|
‒
|
○
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
○
|
○
|
●
|
●
|
‒
|
‒
|
●
|
‒
|
‒
|
●
|
‒
|
‒
|
●
|
‒
|
| Volkerak |
‒
|
‒
|
‒
|
○
|
‒
|
○
|
‒
|
○
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
○
|
‒
|
‒
|
○
|
‒
|
‒
|
○
|
‒
|
‒
|
●
|
‒
|
‒
|
●
|
‒
|
‒
|
●
|
‒
|
| Waddenzee |
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
○
|
○
|
○
|
‒
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
●
|
●
|
○
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
●
|
| Westerschelde |
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
○
|
○
|
○
|
‒
|
○
|
○
|
○
|
●
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
○
|
| Zandmaas |
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
○
|
○
|
○
|
●
|
●
|
○
|
○
|
●
|
○
|
●
|
●
|
●
|
○
|
●
|
●
|
○
|
●
|
| Zwarte Meer |
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
‒
|
○
|
‒
|
‒
|
●
|
‒
|
‒
|
●
|
‒
|
‒
|
●
|
‒
|
‒
|
●
|
‒
|
‒
|
●
|
