English
norskBlar i forfatter "Finstad, Bengt"
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Area protection may reduce salmon louse infection risk to wild salmonids
(Journal article; Tidsskriftartikkel; Peer reviewed, 2011-05-30)ABSTRACT: Salmon louse <i>Lepeophtheirus salmonis</i> Krøyer infection levels in both wild sea trout <i>Salmo trutta</i> L. and sentinel Atlantic salmon <i>Salmo salar</i> L. smolts were investigated inside and outside a temporary protected zone with limits on fish farming in the intensively farmed Romsdalsfjord system. Wild sea trout outside the protected zone had higher prevalence and significantly ... -
Do Norwegian Atlantic salmon feed in the northern Barents Sea? Tag recoveries from 70 to 78 degrees N
(Journal article; Tidsskriftartikkel; Peer reviewed, 2008-01-13)Three tagged Atlantic salmon Salmo salar were recaptured as subadults/adults (1.4 - 3 kg) between 70.5º - 78º N in the western Barents Sea; two of the fish originated from the Alta Fjord region in northern Norway and one from the Drammen River, south-eastern Norway. An additional tag was recovered from the stomach of a Greenland halibut captured south-west of Bear Island at >600m depth; this tag was ... -
Effects of salmon lice on sea trout
(Research report; Forskningsrapport, 2014) -
Finding the needle in the haystack: Comparison of methods for salmon louse enumeration in plankton samples
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-03-07)The economic and social implications of salmon louse (Lepeophtheirus salmonis) epidemics in salmon aquaculture drive focus of the dispersal dynamics of the planktonic larval stages. The vast spatial scale and high connectivity of the marine environment creates difficult conditions to monitor the infective planktonic louse stage, whereby the number of samples required for a representative description ... -
The major threats to Atlantic salmon in Norway
(Journal article; Tidsskriftartikkel; Peer reviewed, 2017-03-03)Atlantic salmon (Salmo salar) is an economically and culturally important species. Norway has more than 400 watercourses with Atlantic salmon and supports a large proportion of the world’s wild Atlantic salmon. Atlantic salmon are structured into numerous genetically differentiated populations, and are therefore managed at the population level. Long-distance migrations between freshwater and ocean ... -
Redefining the oceanic distribution of Atlantic salmon
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-06-10)Determining the mechanisms driving range-wide reductions in Atlantic salmon marine survival is hindered by an insufcient understanding of their oceanic ecology and distribution. We attached 204 pop-up satellite archival tags to post-spawned salmon when they migrated to the ocean from seven European areas and maiden North American salmon captured at sea at West Greenland. Individuals migrated ... -
Registreringer av lakselus på laks, sjøørret og sjørøye i 2004
(Research report; Forskningsrapport, 2005-06)Results from 2004 showed that the lice infection pressure varied between the different monitoring stations in time and space and that the overall pattern was moderate to high infection in all areas. This is in spite of the fact that the fish farmers have improved their implementation of delousing strategies in fish farms. The density of fish farms is high all along the coast. The total biomass may ... -
Relationship between marine growth and sea survival of two anadromous salmonid fish species
(Journal article; Tidsskriftartikkel; Peer reviewed, 2017-06-12)Résumé : L’étude fait état de preuves empiriques appuyant le paradigme de « croissance–survie » chez les phases marines de l’omble chevalier (Salvelinus alpinus) et de la truite de mer (Salmo trutta). Ce paradigme postule que les individus plus grands ou a` croissance plus rapide sont plus susceptibles de survivre que leurs conspécifiques plus petits ou a` croissance plus lente. Nous avons utilisé ... -
Return migration of adult Atlantic salmon (Salmo salar L.) to northern Norway
(Journal article; Tidsskriftartikkel; Peer reviewed, 2017-09-18)The return migration of adult Atlantic salmon was investigated by analysing recaptures of individuals tagged and released as smolts in the River Altaelva and the River Halselva using a catch per unit effort approach. Although the salmon were recaptured over a large area along the coastline (from >1100 km south to>500 km northeast of their home rivers), the results indicated a relatively accurate ... -
Sea trout adapt their migratory behaviour in response to high salmon lice concentrations
(Journal article; Tidsskriftartikkel; Peer reviewed, 2017-11-21)Sea trout face growth–mortality trade-offs when entering the sea to feed. Salmon lice epizootics resulting from aquaculture have shifted these trade-offs, as salmon lice might both increase mortality and reduce growth of sea trout. We studied mortality and behavioural adaptations of wild sea trout in a large-scale experiment with acoustic telemetry in an aquaculture intensive area that was fallowed ... -
Timing is everything: Survival of Atlantic salmon Salmo salar postsmolts during events of high salmon lice densities
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-04-07)<ol> <li>Atlantic salmon in aquaculture act as reservoir hosts and vectors of parasites like salmon lice and this parasite is shown to harm wild salmonid populations.</li> <li>In this study, <i>n</i> = 29,817 tagged Atlantic salmon were studied in four release trials. Half of the released fish were given prophylactic treatment against lice, the other half represented sham control fish. We used ...
