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Your search keyword '"Bjorn, Pal A."' showing total 23 results
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23 results on '"Bjorn, Pal A."'

18. Physiological consequences of 'premature freshwater return' for wild sea-run brown trout (Salmo trutta) postsmolts infested with sea lice (Lepeophtheirus salmonis)

Author

Wells, Alan, Grierson, Christal E., Marshall, Laura, MacKenzie, Monique, Russon, Iain J., Reinardy, Helena, Sivertsgard, Rolf, Bjorn, Pal A., Finstad, Bengt, Bonga, Sjoerd E. Wendelaar, Todd, Christopher D., and Hazon, Neil

Subjects
Brown trout -- Physiological aspects, Host-parasite relationships -- Physiological aspects, Freshwater ecology -- Research, Physiological research, Earth sciences
Abstract

Abstract: The physiological consequences of 'premature migratory return' to freshwater for wild sea-run brown trout (Salmo trutta) smolts infested with sea lice (Lepeophtheirus salmonis) were investigated in the laboratory. Osmoregulatory, [...]

Published
2007

20. Physiological effects of simultaneous, abrupt seawater entry and sea lice (Lepeophtheirus salmonis) infestation of wild, sea-run brown trout (Salmo trutta) smolts

Author

Wells, Alan, Grierson, Christal E., MacKenzie, Monique, Russon, Iain J., Reinardy, Helena, Middlemiss, Claire, Bjorn, Pal A., Finstad, Bengt, Wendelaar Bonga, Sjoerd E., Todd, Christopher D., and Hazon, Neil

Subjects
Brown trout -- Research, Brown trout -- Physiological aspects, Salmon -- Research, Salmon -- Physiological aspects, Sea-water -- Research, Earth sciences
Abstract

Abstract: For wild, sea-run brown trout (Salmo trutta) smolts, the physiological consequences of abrupt transfer to seawater and simultaneous challenge with copepodid larvae of the sea louse, Lepeophtheirus salmonis (Kroyer, [...]

Published
2006

22. Lice pressure from salmon farms on wild sea trout (Salmo trutta) in a Norwegian fjord

Author

Arechavala-Lopez Pablo, Berg Marius, Uglem Ingebrigt, Bjorn Pal Arne, and Finstad Bengt

Subjects
endocrine system, Global and Planetary Change, lcsh:QH1-199.5, Norway, Environmental effects, animal diseases, Ocean Engineering, Aquaculture, lcsh:General. Including nature conservation, geographical distribution, Aquatic Science, Oceanography, sea lice, salmonids, parasitic diseases, parasite, lcsh:Q, skin and connective tissue diseases, lcsh:Science, Water Science and Technology
Abstract

Salmon lice Lepeophtheirus salmonis are external parasites on salmonids in the marine environment. However, during recent years, salmon lice abundance has increased due to the presence of salmon farming. Scientific studies shows that salmon farming increases the abundance of lice in the marine habitat and that salmon lice in the most intensively farmed areas have negatively affected wild fish populations. The present study assesses the spatiotemporal distribution of salmon lice infestations on wild sea trout population in the Romsdalsfjord region (Norway), and the potential relationship with fish-farming activity and environmental parameters in this area. Salmon lice at farms varied among localities or farming areas, although infestation levels were under the safety established thresholds (max: 0.5 adult females per fish) in most of the cases. However, salmon farms with these levels might produce and release millions of copepods, potentially infecting wild salmonids. In accordance, low lice loads were recorded on wild sea trout captured in areas with low farming activity, while higher mean loads were recorded in areas with higher farming activity. A clear seasonal pattern and a positive correlation between lice on sea trout and sea water temperature were observed throughout the study period. The estimated production of copepods at farms and the mobile lice counted on wild sea trout one month later were correlated, suggesting the potential use of lice monitoring on sea trout as a proxy indicator of salmon lice infestation risks.

Published
2015
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