Re-introduction of Atlantic salmon, Salmo salar L., to the Tadnoll Brook, Dorset
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...
Main Authors: | , , , , , , , |
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Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
2009
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Subjects: | |
Online Access: | http://nora.nerc.ac.uk/id/eprint/5560/ http://www.dorsetcountymuseum.org/research/c130.html |
Summary: | 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. |
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