Tagging mortality of Greenland halibut Reinhardtius hippoglossoides (Walbaum)

Claus Stenberg, Margaret A. Treble

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Abstract

Tagging mortality for Greenland halibut (Reinhardtius hippoglossoides) was studied under summer and winter conditions. The fish were caught using longlines and tagged with a T-bar tag. The winter experiment was conducted in Cumberland Sound, Canada in May 1997. Air temperatures were below 0degreeC and cold water-masses were present at 0-300 m. Fish were immediately placed in a tub of water after capture and transported by snowmobile to a heated tent for tagging and then placed in cages that were submerged to 300 m depth. The summer experiment was conducted in Upernavik, Greenland in August 1998. Air temperatures were above 0degreeC but intermediate cold water-masses were present at 60-200 m. In the summer experiment, fish were tagged and released in a observation tank to assess immediate tagging mortality (1 to 18 hr). They were then placed in specially designed cages and submerged to 300-500 m to assess short-term tagging mortality (up to 117 hr). A total of 155 Greenland halibut were included in the study. Overall tagging mortality was estimated to be 7%. Immediate handling and tagging mortality in both winter and summer experiments was low (
Original languageEnglish
JournalJournal of Northwest Atlantic Fishery Science
Volume31
Pages (from-to)373-385
ISSN0250-6408
Publication statusPublished - 2003
Externally publishedYes

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