Usage of the NEDAP Trail system in the Rhine/Meuse basin

Transcription

1 Usage of the NEDAP Trail system in the Rhine/Meuse basin André Breukelaar RWS WNZ Tel +31 (0) l Wander Fische ohne Grenzen Siegburg

2 Rhine-Meuse estuary Basin km2 Average discharge Rhine 2200 m3/s Meuse 230 m3/s Delta km2 50% below sea level 3 water bodies: Haringvliet (80 km2) Hollandsch diep (38 km2) Biesbosch (10 km2) Total length 64 km Max. depth 5-12 m.

3 Haringvliet dam

4 Haringvliet sluices

5 Delta area of river Rhine and Meuse

6 Weir Sambeek

7 Fishway Sambeek

8 Weir Hagestein

9 Fishway Hagestein

10 Fishway Amerongen

11 Methods Telemetry System Transponder Detection stations Catch Tagging

12 Nedap Trail system Transformer

13 Diagram detection station

14 Semi-mobil detection station

15 Transponders Life time: small 4-6 months midle years large 3-4 years

16 Implantation of a transponder

17 Smolt migration study in the river Meuse Aim of study To gain insight in the migration of Salmon smolts in the river Meuse, to determine choice of route and migration speed of individual fishes in relation to river discharge and other factors; To obtain a reliable estimation of the average mortality of Salmon smolts during downstream migration in the Dutch part of the river Meuse To quantify direct and indirect mortality of smolts passing hydropower stations and weirs. This knowledge helps to formulate suitable measures to facilitate fish migration at barriers like hydropower stations and weirs, to protect fish in general and to support decision making in the process of licencing hydropower stations.

18 Weirs and hydropower stations in the river Meuse North Sea = hydropower station = weir

19 Hydropower station Linne, weir and fishway

20 Weir at Linne

21 Fishway Linne

22 Detection stations in river Rhine and Meuse

23 Detection stations at Linne

24 Results migration of smolts In total 897 smolts were released at two different locations in the river Meuse (near Belgian border and 56 km downstream) At location Linne, 192 smolts passed through the hydropower station and 144 smolts passed over the weir in downstream direction. In the downstream river stretch from Linne to Lith (126 km), 52% of the smolts that passed through the hydropower station Linne were lost, compared to 42% of the smolts that passed over the weir

25 Migration of smolts Linear regression shows no significant difference in mortality rate of smolts passing through the hydropower station and smolts passing over the weir. Smolts passing hydropower station Linne Smolts passing weir Linne Percentage 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% y = -0,003x + 0,8164 R² = 0, Distance from hydropower station Linne (km) Percentage 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% y = -0,0027x + 0,8798 R² = 0, Distance from weir Linne (km)

26 Migration of smolts Segmented linear regression shows significant difference in mortality rates over the first stretch after passing hydropower station and weir, compared to the latter part of the route to sea. Smolts passing weir Linne Percentage 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% y = -0,0139x + 0,9892 R² = 0,9764 y = -0,0017x + 0,7779 R² = 0, Distance from weir Linne (km)

27 Migration of smolts 2009 Segmented linear regression in 2009 shows a higher mortality rate of hydropower smolts compared to weir smolts, but only over the first river stretch (15 km)

28 Effects of cormorants

29 Migration of sea trout via Nieuwe Waterweg

30 2015 Fish migrating river Afsluitdijk

31 Species Salmon Sea trout Smolts Houting Ide Nose carp Barbel Bream Pike perch Eel Sea lamprey

32 Thanks for your attention