Tagging cod for migration study

baldur at star-oddi.com baldur at star-oddi.com
Thu Feb 3 12:22:21 EST 2000


Dear list members
An ICES report has been published on the study of cod migration. In October 
1997, eighty eight wild cod were tagged with data storage tags placed 
inside the buccal cavity.  The release site was approximately 12 nautical 
miles north-west of the Faroe Islands at 62o19'N 7o39'W (100 m).  By August 
1999 forty-one (47 %) were recaptured, all from Faroese waters.  All cod 
stayed exclusively in warm (> 5 oC) Atlantic water.  The cod usually stayed 
at shallow (90-130 m) and nearly constant depth (presumably at the bottom) 
during winter. Thus vertical migration was rare, but two very clear 
examples were observed at exactly the same time, probably feeding in the 
upper layers.  The onset of spawning migration could in some cases be 
detected by a change in depth.

The full report on this project can be viewed at 
http://www.star-oddi.com/cod-tagging-PS.htm

Baldur Sigurgeirsson

Star-Oddi 			E-mail: star-oddi at star-oddi.com
Vatnagardar 14 			Tel: +354 533 6060
104 Reykjavik			Fax:+354 533 6069
Iceland				http://www.star-oddi.com


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