Dispersal of young-of-the-year brown trout (Salmo trutta L.) from spawning beds Effects of parental contribution, body length and habitat
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1 Dispersal of young-of-the-year brown trout (Salmo trutta L.) from spawning beds Effects of parental contribution, body length and habitat Master thesis by Susanna Andersson Supervisors: Daniel Palm SLU, Gustav Hellström Umeå University
2 Disposition
3 Stocking of eggs in a habitat restored stream Electrofishing Dispersal pattern among Young-of-the-year trout Photo: Matti Erikoinen
4 Why? Habitat restoration of streams Stocking of eggs or young trout Knowledge about dispersal biology is necessary Photo : SCA, Creative Commons
5 Questions: Do dispersal differ between families? Is the dispersal restricted to a limited area? Does mesoscale flow and habitat characteristics influence dispersal? Do trout managers need to consider dispersal patterns for successful restoration?
6 Study stream
7 Habitat restoration Falåströmsbäcken
8 Fish species in Falåströmsbäcken
9 October 2014: Parent individuals Downstream power plant in Norrfors Photo : Åke Forssén
10 March 2015: Stocking of eggs Eight families at three locations Photo : Daniel Holmqvist
11 March 2015: Stocking of eggs Eight families at three locations Foto: Daniel Holmström Photo : Daniel Palm Photo : Daniel Holmqvist Photo : Daniel Palm
12 August & September 2015: Electro fishing DNA-analysis on chosen individuals
13 About the results 433 trout More bullheads Most of the trout close to the stream banks Earlier study have observed the same pattern 1 1. Roussel, J. M. & Bardonnet, A Ontogeny of diel pattern of stream-margin habitat use by emerging brown trout, Salmo trutta, in experimental channels: influence of food and predator presence. Environmental Biology of Fishes, 56,
14 Family Do dispersal differ between families? Stocking point Stocking point 1 Stocking point Distance from Lake Österavan (m)
15 Is the dispersal restricted to a limited area? Mainly downstream eg. 1, 2, 3 Downstream: 97% in 200m Upstream: 97% in 100m 1. Beall, E., Dumas, J., Claireaux, D., Barriere, L. & Marty, C Dispersal patterns and survival of Atlantic salmon (Salmo salar L) juveniles in a nursery stream. Ices Journal of Marine Science, 51, Daufresne, M., Capra, H. & Gaudin, P Downstream displacement of post-emergent brown trout: effects of development stage and water velocity. Journal of Fish Biology, 67, García de Leaniz, C., Fraser, N. & Huntingford, F. A Variability in performance in wild Atlantic salmon, Salmo salar L., fry from a single redd. Fisheries Management and Ecology, 7,
16 Number of brown trout Number of brown trout Does mesoscale flow and habitat characteristics influence dispersal? Mean stream bed particle size (cm) ,2 0,4 0,6 0,8 1 1,2 Mean depth (m)
17 Does mesoscale flow and habitat characteristics influence dispersal? = pool = run = riffle without white water = riffle with white water
18 Do trout managers need to consider dispersal patterns for successful restoration? Stocking of eggs in unsuitable habitat extra mortality 1 Space of 300 m between spawning beds/stocking points Avoid pools Locate in a run Close to a slow-flowing riffle 1. Syrjänen, J. T., Ruokonen, T. J., Ketola, T. & Valkeajärvi, P The relationship between stocking eggs in boreal spawning rivers and the abundance of brown trout parr. Ices Journal of Marine Science, 72,
19 Further use of this knowledge Important when following up with electrofishing If reproduction is natural even more important
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21 Sammanfattning Inledning Material & Metod Resultat & Diskussion Ej signifikant Familj Kroppslängd Familj Spridningsavstånd (förutom familj 6 i Augusti) Spridningsriktning Spridningsavstånd Kroppslängd - Spridningsavstånd
22 Sammanfattning Inledning Material & Metod Resultat & Diskussion Signifikant Familj Spridningsavstånd (Familj 6 i Augusti) Antal årsöringar partikelstorlek Antal årsöringar - djup Antal årsöringar - strömbild
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25 September: Antal öringar hastighet
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