Assessment of the migration of Atlantic Cod (Gadus morhuaL.) between the stocks off West and East Greenland in 1984–86 by means of otolith typing
A method to identify individual cod (Gadus morhua) originating from either of the nursery areas off West or East Greenland is described. The method is based on a visual classification of individual annuli of the cod otoliths (sagitta) into three different types based on the formation of opaque and h...
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ftopenagrar:oai:www.openagrar.de:timport_mods_00029312 2024-09-15T17:55:31+00:00 Assessment of the migration of Atlantic Cod (Gadus morhuaL.) between the stocks off West and East Greenland in 1984–86 by means of otolith typing Rätz, Hans-Joachim 1994 11 https://www.openagrar.de/receive/timport_mods_00029312 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00029312/dn054252.pdf http://journal.nafo.int/intro/volumes_.html eng eng Journal of Northwest Atlantic fishery science -- 0250-6408 -- 155652-6 https://www.openagrar.de/receive/timport_mods_00029312 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00029312/dn054252.pdf http://journal.nafo.int/intro/volumes_.html only signed in user info:eu-repo/semantics/restrictedAccess article Text cod Greenland migration assessment natural tags otholiths article Text doc-type:article 1994 ftopenagrar 2024-07-08T23:56:24Z A method to identify individual cod (Gadus morhua) originating from either of the nursery areas off West or East Greenland is described. The method is based on a visual classification of individual annuli of the cod otoliths (sagitta) into three different types based on the formation of opaque and hyaline zones. The different hydrographic conditions off East and West Greenland probably affected the growth of the cod and were thus manifested as natural tags, in the form of different annuli of the otoliths. The calculation of emigration and immigration rates using the otoliths as natural tags confirmed the cod migration derived from tagging experiments, i.e. a one-way migration from West to East Greenland. In 1984–86, a very strong and rapid emigration of maturing cod from West to East Greenland occurred. The coefficients of emigration of the cod stock off West Greenland increased with age, pointing to a homing phenomenon as the migration factor. Article in Journal/Newspaper atlantic cod East Greenland Gadus morhua Greenland OpenAgrar (OA) |
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language |
English |
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article Text cod Greenland migration assessment natural tags otholiths |
spellingShingle |
article Text cod Greenland migration assessment natural tags otholiths Rätz, Hans-Joachim Assessment of the migration of Atlantic Cod (Gadus morhuaL.) between the stocks off West and East Greenland in 1984–86 by means of otolith typing |
topic_facet |
article Text cod Greenland migration assessment natural tags otholiths |
description |
A method to identify individual cod (Gadus morhua) originating from either of the nursery areas off West or East Greenland is described. The method is based on a visual classification of individual annuli of the cod otoliths (sagitta) into three different types based on the formation of opaque and hyaline zones. The different hydrographic conditions off East and West Greenland probably affected the growth of the cod and were thus manifested as natural tags, in the form of different annuli of the otoliths. The calculation of emigration and immigration rates using the otoliths as natural tags confirmed the cod migration derived from tagging experiments, i.e. a one-way migration from West to East Greenland. In 1984–86, a very strong and rapid emigration of maturing cod from West to East Greenland occurred. The coefficients of emigration of the cod stock off West Greenland increased with age, pointing to a homing phenomenon as the migration factor. |
format |
Article in Journal/Newspaper |
author |
Rätz, Hans-Joachim |
author_facet |
Rätz, Hans-Joachim |
author_sort |
Rätz, Hans-Joachim |
title |
Assessment of the migration of Atlantic Cod (Gadus morhuaL.) between the stocks off West and East Greenland in 1984–86 by means of otolith typing |
title_short |
Assessment of the migration of Atlantic Cod (Gadus morhuaL.) between the stocks off West and East Greenland in 1984–86 by means of otolith typing |
title_full |
Assessment of the migration of Atlantic Cod (Gadus morhuaL.) between the stocks off West and East Greenland in 1984–86 by means of otolith typing |
title_fullStr |
Assessment of the migration of Atlantic Cod (Gadus morhuaL.) between the stocks off West and East Greenland in 1984–86 by means of otolith typing |
title_full_unstemmed |
Assessment of the migration of Atlantic Cod (Gadus morhuaL.) between the stocks off West and East Greenland in 1984–86 by means of otolith typing |
title_sort |
assessment of the migration of atlantic cod (gadus morhual.) between the stocks off west and east greenland in 1984–86 by means of otolith typing |
publishDate |
1994 |
url |
https://www.openagrar.de/receive/timport_mods_00029312 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00029312/dn054252.pdf http://journal.nafo.int/intro/volumes_.html |
genre |
atlantic cod East Greenland Gadus morhua Greenland |
genre_facet |
atlantic cod East Greenland Gadus morhua Greenland |
op_relation |
Journal of Northwest Atlantic fishery science -- 0250-6408 -- 155652-6 https://www.openagrar.de/receive/timport_mods_00029312 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00029312/dn054252.pdf http://journal.nafo.int/intro/volumes_.html |
op_rights |
only signed in user info:eu-repo/semantics/restrictedAccess |
_version_ |
1810431786714398720 |