Linking habitat characteristics and juvenile density to quantify Salmo salar & Salmo trutta smolt production in River Sävarån, Northern Sweden
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...
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| Formato: | Otro |
| Lenguaje: | sueco Inglés |
| Publicado: |
2008
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| Materias: | |
| Acceso en línea: | https://stud.epsilon.slu.se/12993/ |
| Sumario: | 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. |
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