Acknowledgements Hans Lundqvist, SLU Jan Nilsson, SLU. Photo: Hans Lundqvist

Transkript

1 Photo: Hans Lundqvist Genetics in management of the Baltic salmon and sea trout Johan Östergren Institute of Freshwater Research SLU-Aqua, Swedish University of Agricultural Sciences Acknowledgements Hans Lundqvist, SLU Jan Nilsson, SLU

2 Life history of salmon and sea trout Spawning Hatching and rearing Spawning migration Important Smolt and kelt downstream migration Homing & straying Local adaptation Genetic structure & genetic diversity (modified from Lundqvist, 1983) Feeding at sea

3 Salmon Säisä et al (2005) CJFAS

4 Sea trout Östergren et al 2011, submitted CG

5 Isolation by distance in Baltic sea trout All Wild (solid line) hatchery (dotted line)

6 How can the information be used in management? ICES, 2011

7 Genetic assignment: Who? When? Where? Mixed Stock Analysis, MSA (Mixed fishery analysis) Från: Utter & Ryman (1993)

8 Stock assignment % 7% 7% 10% 54% 20%

9 Proportion stam 0,8 0,7 0,6 0,5 0,4 0,3 Stock assignment Bjuren ,2 0,1 0,0

10 Number Number Individual assignment Bjuren Kalixälven Vindelälven Julian day Kalixälven Vindelälven Julian day

11 Sea trout Bjuren Obbola Stock assignment Skellefteälven Sävarån Torneälven Kalixälven Luleälven Piteälven Skellefteälven Sävarån Ume- Vindelälven Öreälven Ångermanälven Indalsälven Ljungan Ljusnan Dalälven Torneälven Kalixälven Luleälven Piteälven Skellefteälven Sävarån Ume- Vindelälven Öreälven Ångermanälven Indalsälven Ljungan Ljusnan Dalälven

12 Baseline sample Sea trout Sikån Piteälven Sea trout Varjisån Stockforsälven Hundforsen Storforsen 8 loci with 6 alleles, baseline n=28 60/sample F ST among baseline samples: Piteälven Sikån Hundforsen Varjisån Piteå Hundforsen Varjisån km km Stockforsälven

13 Baseline sample Sea trout Sikån n=7 Correct Incorrect Rejected Piteälven Radio-tagged n=27 Varjisån n=8 Individual assignment Stockforsälven Hundforsen n=2 Storforsen Vistån Sikfors, tagging location Piteå km km

14 Km Storforsen Piteälven Km Storforsen Date Date

15 Distance (km) Genetics and migration Opening for fishing TagDay

16 Baseline sample Sea trout Vindelälven Ammarnäs Laisälven Radio-tagged n=36 Krokforsen Renforsen Vindelälven Umeälven Sample Laisälven Krokforsen Krokforsen Norrfors, tagging Renforsen km location Umeå

17 Baseline sample Sea trout Correct Incorrect Rejected Vindelälven Ammarnäs Laisälven n=12 Radio-tagged n=36 Krokforsen n=3 Renforsen n=15 Umeälven km Norrfors, tagging location Umeå

18 Baseline sample Sea trout Correct Incorrect Rejected Vindelälven Ammarnäs Laisälven n=12 Radio-tagged n=36 13% n= Krokforsen n=3 % stocked sea trout (years ) 45% n= % Renforsen n=15 5% Umeälven km Norrfors, tagging location Umeå

19 Genetic studies in the river Sävarån Sea trout and salmon smolt Svarttiduforsen Brännbäckens backe Brännbäckens mynning!( Botsmark Gravån Ladänget Gravån Henriksfors Gärssjöbäcken Klappmarksbäcken!( Sävar Laxgårdsforsen Långforsen övre Smolt trap!( Umeå km

20 Assignment test of smolt to tributaries and main stem in the R. Sävarån. Lokal Provtagningsår Totalt % Gärssjöbäcken % Brännbäckens backe % Brännbäckens mynning % Klappmarksbäcken % Gravån Ladänget % Gravån Henriksfors % Laxgårdsforsen % Långforsen övre % Svarttiduforsen % Stenforsen % Umeälven % Öreälven % Totalt %

21 Stock proportion Stocking of salmon and sea trout in Sävarån > salmon- and sea trout in Salmon from Byskeälven and sea trout from Ume-/Vindelälven and Öreälven. Byskeälven Byskeälven Vindelälven Umeälven km Sävarån N Öreälven Umeå Nilsson, J., Östergren, J., Lundqvist, H. & Carlsson, U Journal of Fish Biology Lundqvist et al In: C. Hurford, M. Schneider & I. Cowx (eds.) Conservation monitoring in freshwater habitats - a practical guide and case studies.

22 Conclusions Spatial and temporal variation Method avaliable MSA, IA Stock level information already at hand Important for both salmon and sea trout Conservation and management Use in temporal and spatial regulations

23 Thanks for your attention!