Comparing survey and assessment data: Consequences for stock evaluation of Northeast Arctic Greenland halibut

Based on VPA-estimates of abundance, survey data and commercial catch statistics of Northeast Arctic Greenland halibut (Reinhardtius hippoglossoides Walbaum), the paper describes trends by year-class and age in the distribution of Greenland halibut between surveyed and not-surveyed areas. Changes in...

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Bibliographic Details
Published in:Scientia Marina
Main Authors: Ole Thomas Albert, Åge S. Høines
Format: Article in Journal/Newspaper
Language:English
Published: Consejo Superior de Investigaciones Científicas 2003
Subjects:
greenland halibut
environment
assessment
recruitment
spawning stock
north atlantic oscillation
climate change
Aquaculture. Fisheries. Angling
SH1-691
Arctic
Svalbard
Greenland
Climate change
North Atlantic
North Atlantic oscillation
Spitsbergen
Online Access:https://doi.org/10.3989/scimar.2003.67s1171
https://doaj.org/article/f7718585998140efb89026765cd359dc
Description
Summary:Based on VPA-estimates of abundance, survey data and commercial catch statistics of Northeast Arctic Greenland halibut (Reinhardtius hippoglossoides Walbaum), the paper describes trends by year-class and age in the distribution of Greenland halibut between surveyed and not-surveyed areas. Changes in the distribution of I-group around 1990 to areas beyond the Svalbard surveys has previously been described and related to temperature changes in the Spitsbergen Current. This paper shows that this displaced distribution of the 1989-94 year-classes persisted up to age 7. The results indicate that the displacement was an extraordinary situation and other similar distribution shifts have not occurred during the last 30 years or more. Further, the shift co-occurred with extreme levels of the 137 year long time series of the index of the North-Atlantic Oscillation (NAO). The results are discussed in relation to stock management and climate change.

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