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Molin, Johan (2008) Linking habitat characteristics and juvenile density to quantify Salmo salar & Salmo trutta smolt production in River Sävarån, Northern Sweden. Other thesis, SLU.

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Even though the European Union has set up goals for rivers that support wild salmon to reach a production that is 50% of the MAXIMUM natural potential, there is a general lack of knowledge about the production capacity of salmonids in Sweden. To estimate the production of salmon and sea trout in the Sävarån river, I combined habitat mapping with available electro-fishing data. Additionally the smolt run was enumerated (with screw-traps) and radio-tracking of migrating spawners was performed. In the river's main branch I found 51 ha potential spawning and nursery habitats. With present juvenile densities, these areas should be able to produce 1300-7580 salmon smolt and 635-3544 trout smolt, in agreement with screw-trap data in the years 2005-2007. A hypothetical maximum production of c. 18400 salmon smolt was also calculated. Telemetry showed that at the time of spawning the radio-tagged adult fish were situated in or close to potential spawning areas that were defined during the habitat mapping.

Item Type: Thesis (Other)
Keywords: Mapping, Flow, Substratum, Electro-fishing, Parr, Radio-telemetry, Spawning
Subject (faculty): Faculty of Veterinary Medicine and Animal Science > Dept. of Wildlife, Fish, and Environmental studies
Divisions: SLU > Faculty of Forest Sciences
Depositing User: Kristina Johansson
Date Deposited: 13 Jun 2008
Last Modified: 18 Aug 2015 10:01
URI: http://ex-epsilon.slu.se/id/eprint/2401

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