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This paper represents a preliminary otolith shape analysis of pelagic redfish (Sebastes mentella) in the Irminger Sea, comparing NAFO and NEAFC convention areas and depth layers (shallower and deeper than 500 m). Elliptical Fourier Analysis (EFA) was applied to describe digitised otolith outlines. T...

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Bibliographic Details
Main Author: Christoph Stransky
Other Authors: The Pennsylvania State University CiteSeerX Archives
Format: Text
Language:English
Published: 2002
Subjects:
Otolith shape analysis
Fourier analysis
redfish
pelagic redfish
Sebastes mentella
North Atlantic
Irminger Sea
Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.550.1402
http://archive.nafo.int/open/sc/2002/scr02-035.pdf
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Summary:This paper represents a preliminary otolith shape analysis of pelagic redfish (Sebastes mentella) in the Irminger Sea, comparing NAFO and NEAFC convention areas and depth layers (shallower and deeper than 500 m). Elliptical Fourier Analysis (EFA) was applied to describe digitised otolith outlines. The resulting Fourier descriptors were used as the basis for discriminant analysis to investigate separation success between area/depth groups. In general, differences in univariate measurements (otolith length, breadth and weight) and otolith shapes between area/depth groups were marginal and subject to high variation. Discriminant analysis indicated poor separation between area/depth groups. Differences in average shapes between the area/depth groups were relatively low. Based on this morphometric study, the existence of separate s tocks of S. mentella in the Irminger Sea seems to be unlikely, neither on a vertical (depth) nor horizontal scale (NAFO/NEAFC areas).

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