Wiederherstellung der Durchgangigkeit für Fische in der Maas André Breukelaar RWS Waterdienst Oedt 13 november 2012 13 november 2012
Einmündung der Niers in der Maas 2 13 november 2012
Weir Sambeek 3 13 november 2012
Fishpass Sambeek 4 13 november 2012
Fishpass Sambeek 5 13 november 2012
Fishpass Sambeek 6 13 november 2012
Haringvlietdam 7 13 november 2012
Haringvliet sluices 8 13 november 2012
Migration of salmon and sea trout in the Rhine delta Some background Rhine Action Programme / Salmon 2000 research objectives: What are the migration routes from sea to the spawning sites? What is the efficiency of fish passes in the Netherlands? Which factors influence the migration of salmonids? 9 13 november 2012
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Salmon fishing 11 13 november 2012
Local market 12 13 november 2012
Salmonid catches 1875 1950. Much disputed graph of Dr. S.J. de Groot, IMARES, IJmuiden. 300000 250000 Nederland Duitsland Totaal 200000 150000 100000 50000 0 1875 1880 1885 1890 1895 1900 1905 1910 1915 1920 1925 1930 1935 1940 1945 1950 13 13 november 2012
Salmon stocking 1850-1870: 10 million juvenile salmon stocked in Germany; 1871-1912: 160 million juvenile salmon stocked in Germany and Switzerland; 1872-1897: 13,5 million parrs and 300.000 smolts stocked in the Netherlands; 1879: first tagging experiments with salmon; 12.000 tagged smolts released, 1 returnee on 332 smolts stocked. 14 13 november 2012
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Detection stations 16 13 november 2012
Migration of salmonids period 1996 2000 Back tot 1996 2000. RWS Waterdienst commissioned installation of the NEDAP trail system. Salmon and sea trout were caught near river entrances and sluices and tagged with NEDAP transponders. Inland migration was followed. 17 13 november 2012
Migration of salmonids period 1996 2000 Back tot 1996 2000. RWS Waterdienst commissioned installation of the NEDAP trail system. Salmon and sea trout were caught near river entrances and sluices and tagged with NEDAP transponders. Inland migration was followed. 18 13 november 2012
Migration of salmonids period 1996 2000 Back tot 1996 2000. RWS Waterdienst commissioned installation of the NEDAP trail system. Salmon and sea trout were caught near river entrances and sluices and tagged with NEDAP transponders. Inland migration was followed. 19 13 november 2012
Migration of salmonids period 1996 2000 Back tot 1996 2000. RWS Waterdienst commissioned installation of the NEDAP trail system. Salmon and sea trout were caught near river entrances and sluices and tagged with NEDAP transponders. Inland migration was followed. 20 13 november 2012
Research goals: To find out what the efficiency of the fish pass is for salmonids; The extend of use of the shipping locks for migration of salmonids. Evaluation of the fish pass near Sambeek on the Meuse During three years of research 96 salmonids (11 salmon, 84 sea trout and 1 rainbow trout) were caught downstream of Lith (most downstream barrier on the river Meuse) and tagged with NEDAP transponders. 21 13 november 2012
Evaluation of the fish pass near Sambeek on the Meuse 22 13 november 2012
Evaluation of the fish pass near Sambeek on the Meuse Fish pass Weirs Shipping locks 23 13 november 2012
Schematic diagram of the research area 1 = detection station Balgoij; 5 = detection station fish pass; 2 = weir Grave; 6 = detection station Afferden 3 = Cuijk (release location); 4 = detection station Sambeek (weir); 24 13 november 2012
Possible migration scenarios in research area A: fish that, after release, directly migrated through the fish pass (49); B: fish outside research area (4) and fish that first migrated downstream (5); C: fish outside research area that could not pass the weir at Grave (3); D: fish that migrated downstream after being released (27); E: fish outside research area that migrated downstream (22); F: fish that were not detected after release (11). 25 13 november 2012
Results: Starting with 96 fish at release point 3: 11 fish were never detected downstream or upstream (tagging or fisheries mortality?); 27 fish only detected on station 1: migrated downstream (not motivated?); 58 fish migrated upstream and were detected on station 4: all passed successfully! 26 13 november 2012
68:00:00 64:00:00 Time to find the fish way 60:00:00 56:00:00 52:00:00 48:00:00 search time (hours) 44:00:00 40:00:00 36:00:00 32:00:00 28:00:00 24:00:00 20:00:00 16:00:00 12:00:00 8:00:00 4:00:00 0:00:00 1 2 3 4 5 6 7 8 9 10 11 12 13 serial number registrated fish 27 13 november 2012
Time to detection upstream near Afferden 24:00:00 20:00:00 Passing time (hours) 16:00:00 12:00:00 8:00:00 4:00:00 0:00:00 1 5 9 13 17 21 25 29 33 37 41 45 serial number registrated fish 28 13 november 2012
Some other conclusions: Evaluation of the fish pass near Sambeek on the Meuse Of the 58 fish that passed successfully, 5 fish were not detected in the fish pass. It was assumed that these fish passed via the shipping locks; Within 25 hours 2/3 of the fish detected downstream finds the entrance of the fish pass; Within the next 24 hours almost all fish succeed in reaching the detection station upstream of Sambeek; There is no relationship between successful passage and factors like time, discharge, flow velocity, temperature, weight and length of the fish; Overall migration speed (in days) is positively correlated with condition index of the fish; Migration delay at Sambeek is several hours up to 2 days. We conclude that this is not problematic. 29 13 november 2012
species Lachs Meerforelle Smolts Schnäpel Aland Nase Barbe Brachsen Zander Aal Meerneunauge 30 13 november 2012
Thank you for your attention 31 13 november 2012