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Re-introduction of Atlantic salmon, Salmo salar L., to the Tadnoll Brook, Dorset

By Francois K. Edwards, Rasmus B. Lauridsen, Wendy P.A. Fernandes, William R.C. Beaumont, Anton T. Ibbotson, Luke Scott, Cynthia E. Davies and J. Iwan Jones

Abstract

Atlantic salmon had become extinct in Tadnoll Brook, Dorset, a tributary of the Frome. Fry were reared from River Frome native stock and introduced to Tadnoll Brook. Dispersal downstream of the introduction site was high initially, through at least 1 km; despite dispersal a density of salmon parr of 8 per 100 m2 was achieved in the introduction reach. Survival was 71 % egg – fry in egg boxes, 4.1 % fry – smolt and 2.9 % egg – smolt. There were two migratory periods, in the autumn following the introduction, and in the following spring. Approximately 45 % of the surviving population remained in Tadnoll Brook for a second summer. Observed patterns were consistent with suggestions that fry and parr distribution is constrained by habitat limitation

Topics: Zoology, Ecology and Environment
Year: 2009
OAI identifier: oai:nora.nerc.ac.uk:5560
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