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13 results on '"Björnsson, Höskuldur"'

2. North Western Working Group (NWWG)

Author

Rolskiy, Alexey, Retzel, Anja, Bardarson, Birkir, Elvarsson, Bjarki Thor, Hjörleifsson, Einar, Riget, Frank Farsø, Mohr Vang, Helga Bára, Christensen, Helle Torp, Björnsson, Höskuldur, Boje, Jesper, Werner, Karl-Michael, Kristinsson, Kristján, Cruz, Luis Ridao, Steingrund, Petur, Fernandez, Ruth, and Jansen, Teunis

Published
2020

8. Assessment of golden redfish (Sebastes marinus L) in Icelandic waters

Author

Björnsson, Höskuldur and Sigurdsson, Thorsteinn

Subjects
assessment, redfish, length-based methods, population models, lcsh:SH1-691, Aquaculture. Fisheries. Angling, SH1-691, lcsh:Aquaculture. Fisheries. Angling
Abstract

Assessment of redfish has traditionally suffered from the inability to age the fish. For golden redfish in Icelandic waters, length distributions and abundance indices are available both from commercial catch and from surveys, particularly a groundfish survey in March. This paper addresses the use of an age- and length-based cohort model for the assessment of redfish, where all selection curves depend on the length of the fish and information on age is not a prerequisite but can be utilised if available. In the last few years it appears that ageing of this species has been successful and in this paper we compare assessment results of a model that incorporates age information with those that do not. Finally, we calculate yield per recruit, Fmax and F0.1 for the stock. Stock size, catch and fishing mortality are then simulated 10 years ahead using different catch control laws., No disponible

Published
2003
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10. Report of the Study Group to Evaluate the Effects of Multispecies Interactions

Author

Adlerstein, Sara, Basson, Marinelle, Bell, Ewen, Björnsson, Höskuldur, Bravington, Mark, Bromley, Peter, Daan, Niels, Dobby, Helen, Duplisea, Daniel, Gislason, Henrik, Harwood, John, Horwood, Joe, Köster, Friedrich, Metcalfe, Julian, O'Brien, Carl, Raid, Tiit, Stokes, Kevin, Tjelmeland, Sigurd, and Vinther, Morten

Published
1999

13. Historical changes in genotypic frequencies at the Pantophysin locus in Atlantic cod ( Gadus morhua) in Icelandic waters: evidence of fisheries-induced selection?

Author

Jakobsdóttir, Klara B., Pardoe, Heidi, Magnússon, Árni, Björnsson, Höskuldur, Pampoulie, Christophe, Ruzzante, Daniel E., and Marteinsdóttir, Guðrún

Subjects
ATLANTIC cod, LOCUS (Genetics), MICROSATELLITE repeats, SPAWNING, FISH genetics
Abstract

The intense fishing mortality imposed on Atlantic cod in Icelandic waters during recent decades has resulted in marked changes in stock abundance, as well as in age and size composition. Using a molecular marker known to be under selection ( Pan I) along with a suite of six neutral microsatellite loci, we analysed an archived data set and revealed evidence of distinct temporal changes in the frequencies of genotypes at the Pan I locus among spawning Icelandic cod, collected between 1948 and 2002, a period characterized by high fishing pressure. Concurrently, temporal stability in the composition of the microsatellite loci was established within the same data set. The frequency of the Pan IBB genotype decreased over a period of six decades, concomitant with considerable spatial and technical changes in fishing effort that resulted in the disappearance of older individuals from the fishable stock. Consequently, these changes have likely led to a change in the genotype frequencies at this locus in the spawning stock of Icelandic cod. The study highlights the value of molecular genetic approaches that combine functional and neutral markers examined in the same set of individuals for investigations of the selective effects of harvesting and reiterates the need for an evolutionary dimension to fisheries management. [ABSTRACT FROM AUTHOR]

Published
2011
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