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- Title
Movements and dispersal of farmed Atlantic salmon following a simulated-escape event.
- Authors
Solem, Øyvind; Hedger, Richard; Urke, Henning; Kristensen, Torstein; Økland, Finn; Ulvan, Eva; Uglem, Ingebrigt
- Abstract
One of the major challenges for understanding the ecological impact of escaped farmed Atlantic salmon ( Salmo salar L.) is predicting their dispersal patterns after an escape event. Here, we quantify the behaviour of escaped farmed salmon using a simulated-escape experiment within a Norwegian fjord system. Thirty-seven individuals were tagged with acoustic transmitters and their spatial distribution, horizontal movements and diving behaviour was monitored throughout the fjord and accompanying rivers using 29 acoustic receivers. A rapid movement away from the release site occurred. There was no movement into the rivers feeding the fjord and there was no preference for residence at the fish farms: nearly a third of the individuals had a final detection in the outer part of the fjord and no detections occurred from approximately 2 months after release. As it is unlikely that all fish died or remained undetected within the study area it is reasonable to assume that a substantial proportion of the fish moved out of the fjord system. If a recapture program is not implemented immediately after an escape event, we recommend spreading potential recapture efforts over a relatively large area.
- Subjects
NORWAY; ATLANTIC salmon behavior; FISH dispersal; ECOLOGICAL impact; FJORDS; FJORD ecology; FISH farming; FISHERIES
- Publication
Environmental Biology of Fishes, 2013, Vol 96, Issue 8, p927
- ISSN
0378-1909
- Publication type
Article
- DOI
10.1007/s10641-012-0088-0