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...
| Autor principal: | |
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| Formato: | Otro |
| Lenguaje: | sueco Inglés |
| Publicado: |
2008
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| Acceso en línea: | https://stud.epsilon.slu.se/12993/ |
| _version_ | 1855572168315764736 |
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| author | Molin, Johan |
| author_browse | Molin, Johan |
| author_facet | Molin, Johan |
| author_sort | Molin, Johan |
| collection | Epsilon Archive for Student Projects |
| description | 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. |
| format | Otro |
| id | RepoSLU12993 |
| institution | Swedish University of Agricultural Sciences |
| language | Swedish Inglés |
| publishDate | 2008 |
| publishDateSort | 2008 |
| record_format | eprints |
| spelling | RepoSLU129932017-11-22T10:59:12Z https://stud.epsilon.slu.se/12993/ Linking habitat characteristics and juvenile density to quantify Salmo salar & Salmo trutta smolt production in River Sävarån, Northern Sweden Molin, Johan Fisheries and aquaculture - General aspects 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. Trots att EU satt upp ett mål (Salmon Action Plan, SAP) där naturligt laxförande vattendrag skall ha nått en produktion som motsvarar 50 % av den MAXIMALA naturliga föryngringen, saknas i Sverige generell kännedom om den faktiska produktionen för lax och havsöring i åar och älvar. I ett försök att utreda just detta, har det i Sävarån gjorts en habitatkartering som sammanlänkats med tillgängligt elfiskedata. Samtidigt utfördes numrering av utvandrande smolt och radiotelemetristudier av lekvandrande vuxna fiskar. Den totala arean av potentiella lek- och uppväxtområden i huvudfåran var 51 ha. Vid rådande elfisketäthet av stirr bör dessa ytor kunna producera 1300-7580 lax- och 635-3544 öringsmolt, denna uppskattning överensstämde i stort med skattningar gjorda med smoltfälla under åren 2005-2007. En förmodad maximal produktion skattades till ca 18400 lax smolt. Telemetri studier visade att under tiden för lek var radiomärkta vuxna fiskar positionerade i eller nära de potentiella lekområden som hittats under habitatkarteringen. 2008-06-13 Other NonPeerReviewed application/pdf sv https://stud.epsilon.slu.se/12993/1/molin_j_171122.pdf Molin, Johan, 2008. Linking habitat characteristics and juvenile density to quantify Salmo salar & Salmo trutta smolt production in River Sävarån, Northern Sweden. UNSPECIFIED, Umeå. Umeå: (S) > Dept. of Wildlife, Fish and Environmental Studies <https://stud.epsilon.slu.se/view/divisions/OID-251.html> urn:nbn:se:slu:epsilon-s-9031 eng |
| spellingShingle | Fisheries and aquaculture - General aspects Molin, Johan Linking habitat characteristics and juvenile density to quantify Salmo salar & Salmo trutta smolt production in River Sävarån, Northern Sweden |
| title | Linking habitat characteristics and juvenile density to quantify Salmo salar & Salmo trutta smolt production in River Sävarån, Northern Sweden |
| title_full | Linking habitat characteristics and juvenile density to quantify Salmo salar & Salmo trutta smolt production in River Sävarån, Northern Sweden |
| title_fullStr | Linking habitat characteristics and juvenile density to quantify Salmo salar & Salmo trutta smolt production in River Sävarån, Northern Sweden |
| title_full_unstemmed | Linking habitat characteristics and juvenile density to quantify Salmo salar & Salmo trutta smolt production in River Sävarån, Northern Sweden |
| title_short | Linking habitat characteristics and juvenile density to quantify Salmo salar & Salmo trutta smolt production in River Sävarån, Northern Sweden |
| title_sort | linking habitat characteristics and juvenile density to quantify salmo salar & salmo trutta smolt production in river sävarån, northern sweden |
| topic | Fisheries and aquaculture - General aspects |
| url | https://stud.epsilon.slu.se/12993/ https://stud.epsilon.slu.se/12993/ |