English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/26644
Compartir / Impacto:
Estadísticas
Add this article to your Mendeley library MendeleyBASE
Ver citas en Google académico
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Título

Age Readings of Sebastes marinus and S. mentella Otoliths: Bias and Precision Between Readers

AutorStransky, Christoph; Gudmundsdóttir, Sif; Sigurdsson, Thorsteinn; Lemvig, Svend; Nedreaas, Kjell; Saborido-Rey, Fran
Fecha de publicación2003
EditorNorthwest Atlantic Fisheries Organization
CitaciónScientific Council Research (SCR) Documents 03/16 (2003)
SerieN4823
ResumenThis study presents comparative otolith-based age readings of golden redfish (Sebastes marinus) from Iceland and demersal as well as pelagic deep-sea redfish (Sebastes mentella) from East Greenland and the Irminger Sea within an otolith exchange program between institutes in Germany, Iceland, Norway and Spain. A total of 571 otoliths were thin-sectioned and read independently in the participating labs. Age reading results were compared between readers in terms of bias and precision, using a set of statistical tests and graphical methods. Significant bias was observed between readers, mainly caused by deviations between age scores in the higher ages (> 20 years). Percent agreement was poor (< 30%) for a tolerance level of ± 0 years, particularly for the age range 21-40 years, which represents the major fraction of the fished stock. A tolerance level of ± 5 years, however, lead to up to 95% agreement for the age ranges up to 20 years. Precision and bias were generally better for S. marinus than they were for S. mentella, pointing to greater difficulties in the interpretation of growth stuctures for the latter species. The mean age of S. mentella with total lengths of 25-30 cm, which were observed to have recruited from the East Greenland shelf into the Irminger Sea during 1998/99, was determined to be 9-10 years. The observed problems in bias and precision of age readings should to be improved by continuing with similar Sebastes otolith exchange programs and setting up a further age reading workshop to harmonise the interpretation of growth structures. Radiometric ageing is currently being finalised and results will be available for the next NWWG meeting.
Descripción14 páginas, 8 figuras, 2 tablas.
Versión del editorhttp://www.nafo.int/science/publications/SCDocs/2003/abstracts/abstract016.html
URIhttp://hdl.handle.net/10261/26644
ISSN0256-6915
Aparece en las colecciones: (IIM) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
scr03-016.pdf171,13 kBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo
 


NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.