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Comparing survey and assessment data: consequences for stock evaluation of northeast Arctic Greenland halibut
Albert, O.T.; Høines, Å.S. (2003). Comparing survey and assessment data: consequences for stock evaluation of northeast Arctic Greenland halibut, in: Ulltang, Ø. et al. Fish stock assessments and predictions: integrating relevant knowledge: SAP Symposium held in Bergen, Norway 4-6 December 2000. Scientia Marina (Barcelona), 67(Suppl. 1): pp. 171-180
In: Ulltang, Ø.; Blom, G. (2003). Fish stock assessments and predictions: integrating relevant knowledge: SAP Symposium held in Bergen, Norway 4-6 December 2000. Scientia Marina (Barcelona), 67(Suppl. 1). Institut de Ciències de Mar: Barcelona. 374 pp., more
In: Scientia Marina (Barcelona). Consejo Superior de Investigaciones Científicas. Institut de Ciènces del Mar: Barcelona. ISSN 0214-8358, more
Peer reviewed article  

Also published as
  • Albert, O.T.; Høines, Å.S. (2003). Comparing survey and assessment data: consequences for stock evaluation of northeast Arctic Greenland halibut. Sci. Mar. (Barc.) 2003: 171-180, more

Available in  Authors 
Document type: Conference paper

Keywords
    Climatic changes; Environments; Oscillations; Recruitment; Spawning; Stock assessment; PNE, Greenland [Marine Regions]; Marine

Authors  Top 
  • Albert, O.T.
  • Høines, Å.S.

Abstract
    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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